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// <functional> -*- C++ -*-// Copyright (C) 2001-2012 Free Software Foundation, Inc.//// This file is part of the GNU ISO C++ Library. This library is free// software; you can redistribute it and/or modify it under the// terms of the GNU General Public License as published by the// Free Software Foundation; either version 3, or (at your option)// any later version.// This library is distributed in the hope that it will be useful,// but WITHOUT ANY WARRANTY; without even the implied warranty of// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the// GNU General Public License for more details.// Under Section 7 of GPL version 3, you are granted additional// permissions described in the GCC Runtime Library Exception, version// 3.1, as published by the Free Software Foundation.// You should have received a copy of the GNU General Public License and// a copy of the GCC Runtime Library Exception along with this program;// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see// <http://www.gnu.org/licenses/>./** Copyright (c) 1997* Silicon Graphics Computer Systems, Inc.** Permission to use, copy, modify, distribute and sell this software* and its documentation for any purpose is hereby granted without fee,* provided that the above copyright notice appear in all copies and* that both that copyright notice and this permission notice appear* in supporting documentation. Silicon Graphics makes no* representations about the suitability of this software for any* purpose. It is provided "as is" without express or implied warranty.**//** @file include/functional* This is a Standard C++ Library header.*/#ifndef _GLIBCXX_FUNCTIONAL#define _GLIBCXX_FUNCTIONAL 1#pragma GCC system_header#include <bits/c++config.h>#include <bits/stl_function.h>#if __cplusplus >= 201103L#include <typeinfo>#include <new>#include <tuple>#include <type_traits>#include <bits/functexcept.h>#include <bits/functional_hash.h>namespace std _GLIBCXX_VISIBILITY(default){_GLIBCXX_BEGIN_NAMESPACE_VERSIONtemplate<typename _MemberPointer>class _Mem_fn;template<typename _Tp, typename _Class>_Mem_fn<_Tp _Class::*>mem_fn(_Tp _Class::*) noexcept;_GLIBCXX_HAS_NESTED_TYPE(result_type)/// If we have found a result_type, extract it.template<bool _Has_result_type, typename _Functor>struct _Maybe_get_result_type{ };template<typename _Functor>struct _Maybe_get_result_type<true, _Functor>{ typedef typename _Functor::result_type result_type; };/*** Base class for any function object that has a weak result type, as* defined in 3.3/3 of TR1.*/template<typename _Functor>struct _Weak_result_type_impl: _Maybe_get_result_type<__has_result_type<_Functor>::value, _Functor>{ };/// Retrieve the result type for a function type.template<typename _Res, typename... _ArgTypes>struct _Weak_result_type_impl<_Res(_ArgTypes...)>{ typedef _Res result_type; };template<typename _Res, typename... _ArgTypes>struct _Weak_result_type_impl<_Res(_ArgTypes......)>{ typedef _Res result_type; };template<typename _Res, typename... _ArgTypes>struct _Weak_result_type_impl<_Res(_ArgTypes...) const>{ typedef _Res result_type; };template<typename _Res, typename... _ArgTypes>struct _Weak_result_type_impl<_Res(_ArgTypes......) const>{ typedef _Res result_type; };template<typename _Res, typename... _ArgTypes>struct _Weak_result_type_impl<_Res(_ArgTypes...) volatile>{ typedef _Res result_type; };template<typename _Res, typename... _ArgTypes>struct _Weak_result_type_impl<_Res(_ArgTypes......) volatile>{ typedef _Res result_type; };template<typename _Res, typename... _ArgTypes>struct _Weak_result_type_impl<_Res(_ArgTypes...) const volatile>{ typedef _Res result_type; };template<typename _Res, typename... _ArgTypes>struct _Weak_result_type_impl<_Res(_ArgTypes......) const volatile>{ typedef _Res result_type; };/// Retrieve the result type for a function reference.template<typename _Res, typename... _ArgTypes>struct _Weak_result_type_impl<_Res(&)(_ArgTypes...)>{ typedef _Res result_type; };template<typename _Res, typename... _ArgTypes>struct _Weak_result_type_impl<_Res(&)(_ArgTypes......)>{ typedef _Res result_type; };/// Retrieve the result type for a function pointer.template<typename _Res, typename... _ArgTypes>struct _Weak_result_type_impl<_Res(*)(_ArgTypes...)>{ typedef _Res result_type; };template<typename _Res, typename... _ArgTypes>struct _Weak_result_type_impl<_Res(*)(_ArgTypes......)>{ typedef _Res result_type; };/// Retrieve result type for a member function pointer.template<typename _Res, typename _Class, typename... _ArgTypes>struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)>{ typedef _Res result_type; };template<typename _Res, typename _Class, typename... _ArgTypes>struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......)>{ typedef _Res result_type; };/// Retrieve result type for a const member function pointer.template<typename _Res, typename _Class, typename... _ArgTypes>struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) const>{ typedef _Res result_type; };template<typename _Res, typename _Class, typename... _ArgTypes>struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) const>{ typedef _Res result_type; };/// Retrieve result type for a volatile member function pointer.template<typename _Res, typename _Class, typename... _ArgTypes>struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) volatile>{ typedef _Res result_type; };template<typename _Res, typename _Class, typename... _ArgTypes>struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) volatile>{ typedef _Res result_type; };/// Retrieve result type for a const volatile member function pointer.template<typename _Res, typename _Class, typename... _ArgTypes>struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)const volatile>{ typedef _Res result_type; };template<typename _Res, typename _Class, typename... _ArgTypes>struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......)const volatile>{ typedef _Res result_type; };/*** Strip top-level cv-qualifiers from the function object and let* _Weak_result_type_impl perform the real work.*/template<typename _Functor>struct _Weak_result_type: _Weak_result_type_impl<typename remove_cv<_Functor>::type>{ };/// Determines if the type _Tp derives from unary_function.template<typename _Tp>struct _Derives_from_unary_function : __sfinae_types{private:template<typename _T1, typename _Res>static __one __test(const volatile unary_function<_T1, _Res>*);// It's tempting to change "..." to const volatile void*, but// that fails when _Tp is a function type.static __two __test(...);public:static const bool value = sizeof(__test((_Tp*)0)) == 1;};/// Determines if the type _Tp derives from binary_function.template<typename _Tp>struct _Derives_from_binary_function : __sfinae_types{private:template<typename _T1, typename _T2, typename _Res>static __one __test(const volatile binary_function<_T1, _T2, _Res>*);// It's tempting to change "..." to const volatile void*, but// that fails when _Tp is a function type.static __two __test(...);public:static const bool value = sizeof(__test((_Tp*)0)) == 1;};/*** Invoke a function object, which may be either a member pointer or a* function object. The first parameter will tell which.*/template<typename _Functor, typename... _Args>inlinetypename enable_if<(!is_member_pointer<_Functor>::value&& !is_function<_Functor>::value&& !is_function<typename remove_pointer<_Functor>::type>::value),typename result_of<_Functor(_Args&&...)>::type>::type__invoke(_Functor& __f, _Args&&... __args){return __f(std::forward<_Args>(__args)...);}template<typename _Functor, typename... _Args>inlinetypename enable_if<(is_member_pointer<_Functor>::value&& !is_function<_Functor>::value&& !is_function<typename remove_pointer<_Functor>::type>::value),typename result_of<_Functor(_Args&&...)>::type>::type__invoke(_Functor& __f, _Args&&... __args){return std::mem_fn(__f)(std::forward<_Args>(__args)...);}// To pick up function references (that will become function pointers)template<typename _Functor, typename... _Args>inlinetypename enable_if<(is_pointer<_Functor>::value&& is_function<typename remove_pointer<_Functor>::type>::value),typename result_of<_Functor(_Args&&...)>::type>::type__invoke(_Functor __f, _Args&&... __args){return __f(std::forward<_Args>(__args)...);}/*** Knowing which of unary_function and binary_function _Tp derives* from, derives from the same and ensures that reference_wrapper* will have a weak result type. See cases below.*/template<bool _Unary, bool _Binary, typename _Tp>struct _Reference_wrapper_base_impl;// None of the nested argument types.template<typename _Tp>struct _Reference_wrapper_base_impl<false, false, _Tp>: _Weak_result_type<_Tp>{ };// Nested argument_type only.template<typename _Tp>struct _Reference_wrapper_base_impl<true, false, _Tp>: _Weak_result_type<_Tp>{typedef typename _Tp::argument_type argument_type;};// Nested first_argument_type and second_argument_type only.template<typename _Tp>struct _Reference_wrapper_base_impl<false, true, _Tp>: _Weak_result_type<_Tp>{typedef typename _Tp::first_argument_type first_argument_type;typedef typename _Tp::second_argument_type second_argument_type;};// All the nested argument types.template<typename _Tp>struct _Reference_wrapper_base_impl<true, true, _Tp>: _Weak_result_type<_Tp>{typedef typename _Tp::argument_type argument_type;typedef typename _Tp::first_argument_type first_argument_type;typedef typename _Tp::second_argument_type second_argument_type;};_GLIBCXX_HAS_NESTED_TYPE(argument_type)_GLIBCXX_HAS_NESTED_TYPE(first_argument_type)_GLIBCXX_HAS_NESTED_TYPE(second_argument_type)/*** Derives from unary_function or binary_function when it* can. Specializations handle all of the easy cases. The primary* template determines what to do with a class type, which may* derive from both unary_function and binary_function.*/template<typename _Tp>struct _Reference_wrapper_base: _Reference_wrapper_base_impl<__has_argument_type<_Tp>::value,__has_first_argument_type<_Tp>::value&& __has_second_argument_type<_Tp>::value,_Tp>{ };// - a function type (unary)template<typename _Res, typename _T1>struct _Reference_wrapper_base<_Res(_T1)>: unary_function<_T1, _Res>{ };template<typename _Res, typename _T1>struct _Reference_wrapper_base<_Res(_T1) const>: unary_function<_T1, _Res>{ };template<typename _Res, typename _T1>struct _Reference_wrapper_base<_Res(_T1) volatile>: unary_function<_T1, _Res>{ };template<typename _Res, typename _T1>struct _Reference_wrapper_base<_Res(_T1) const volatile>: unary_function<_T1, _Res>{ };// - a function type (binary)template<typename _Res, typename _T1, typename _T2>struct _Reference_wrapper_base<_Res(_T1, _T2)>: binary_function<_T1, _T2, _Res>{ };template<typename _Res, typename _T1, typename _T2>struct _Reference_wrapper_base<_Res(_T1, _T2) const>: binary_function<_T1, _T2, _Res>{ };template<typename _Res, typename _T1, typename _T2>struct _Reference_wrapper_base<_Res(_T1, _T2) volatile>: binary_function<_T1, _T2, _Res>{ };template<typename _Res, typename _T1, typename _T2>struct _Reference_wrapper_base<_Res(_T1, _T2) const volatile>: binary_function<_T1, _T2, _Res>{ };// - a function pointer type (unary)template<typename _Res, typename _T1>struct _Reference_wrapper_base<_Res(*)(_T1)>: unary_function<_T1, _Res>{ };// - a function pointer type (binary)template<typename _Res, typename _T1, typename _T2>struct _Reference_wrapper_base<_Res(*)(_T1, _T2)>: binary_function<_T1, _T2, _Res>{ };// - a pointer to member function type (unary, no qualifiers)template<typename _Res, typename _T1>struct _Reference_wrapper_base<_Res (_T1::*)()>: unary_function<_T1*, _Res>{ };// - a pointer to member function type (binary, no qualifiers)template<typename _Res, typename _T1, typename _T2>struct _Reference_wrapper_base<_Res (_T1::*)(_T2)>: binary_function<_T1*, _T2, _Res>{ };// - a pointer to member function type (unary, const)template<typename _Res, typename _T1>struct _Reference_wrapper_base<_Res (_T1::*)() const>: unary_function<const _T1*, _Res>{ };// - a pointer to member function type (binary, const)template<typename _Res, typename _T1, typename _T2>struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const>: binary_function<const _T1*, _T2, _Res>{ };// - a pointer to member function type (unary, volatile)template<typename _Res, typename _T1>struct _Reference_wrapper_base<_Res (_T1::*)() volatile>: unary_function<volatile _T1*, _Res>{ };// - a pointer to member function type (binary, volatile)template<typename _Res, typename _T1, typename _T2>struct _Reference_wrapper_base<_Res (_T1::*)(_T2) volatile>: binary_function<volatile _T1*, _T2, _Res>{ };// - a pointer to member function type (unary, const volatile)template<typename _Res, typename _T1>struct _Reference_wrapper_base<_Res (_T1::*)() const volatile>: unary_function<const volatile _T1*, _Res>{ };// - a pointer to member function type (binary, const volatile)template<typename _Res, typename _T1, typename _T2>struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const volatile>: binary_function<const volatile _T1*, _T2, _Res>{ };/*** @brief Primary class template for reference_wrapper.* @ingroup functors* @{*/template<typename _Tp>class reference_wrapper: public _Reference_wrapper_base<typename remove_cv<_Tp>::type>{_Tp* _M_data;public:typedef _Tp type;reference_wrapper(_Tp& __indata) noexcept: _M_data(std::__addressof(__indata)){ }reference_wrapper(_Tp&&) = delete;reference_wrapper(const reference_wrapper<_Tp>& __inref) noexcept: _M_data(__inref._M_data){ }reference_wrapper&operator=(const reference_wrapper<_Tp>& __inref) noexcept{_M_data = __inref._M_data;return *this;}operator _Tp&() const noexcept{ return this->get(); }_Tp&get() const noexcept{ return *_M_data; }template<typename... _Args>typename result_of<_Tp&(_Args&&...)>::typeoperator()(_Args&&... __args) const{return __invoke(get(), std::forward<_Args>(__args)...);}};/// Denotes a reference should be taken to a variable.template<typename _Tp>inline reference_wrapper<_Tp>ref(_Tp& __t) noexcept{ return reference_wrapper<_Tp>(__t); }/// Denotes a const reference should be taken to a variable.template<typename _Tp>inline reference_wrapper<const _Tp>cref(const _Tp& __t) noexcept{ return reference_wrapper<const _Tp>(__t); }template<typename _Tp>void ref(const _Tp&&) = delete;template<typename _Tp>void cref(const _Tp&&) = delete;/// Partial specialization.template<typename _Tp>inline reference_wrapper<_Tp>ref(reference_wrapper<_Tp> __t) noexcept{ return ref(__t.get()); }/// Partial specialization.template<typename _Tp>inline reference_wrapper<const _Tp>cref(reference_wrapper<_Tp> __t) noexcept{ return cref(__t.get()); }// @} group functorstemplate<typename... _Cond>using _Require = typename enable_if<__and_<_Cond...>::value>::type;template<typename... _Types>struct _Pack : integral_constant<size_t, sizeof...(_Types)>{ };template<typename _From, typename _To, bool = _From::value == _To::value>struct _AllConvertible : false_type{ };template<typename... _From, typename... _To>struct _AllConvertible<_Pack<_From...>, _Pack<_To...>, true>: __and_<is_convertible<_From, _To>...>{ };template<typename _Tp1, typename _Tp2>using _NotSame = __not_<is_same<typename std::decay<_Tp1>::type,typename std::decay<_Tp2>::type>>;/*** Derives from @c unary_function or @c binary_function, or perhaps* nothing, depending on the number of arguments provided. The* primary template is the basis case, which derives nothing.*/template<typename _Res, typename... _ArgTypes>struct _Maybe_unary_or_binary_function { };/// Derives from @c unary_function, as appropriate.template<typename _Res, typename _T1>struct _Maybe_unary_or_binary_function<_Res, _T1>: std::unary_function<_T1, _Res> { };/// Derives from @c binary_function, as appropriate.template<typename _Res, typename _T1, typename _T2>struct _Maybe_unary_or_binary_function<_Res, _T1, _T2>: std::binary_function<_T1, _T2, _Res> { };/// Implementation of @c mem_fn for member function pointers.template<typename _Res, typename _Class, typename... _ArgTypes>class _Mem_fn<_Res (_Class::*)(_ArgTypes...)>: public _Maybe_unary_or_binary_function<_Res, _Class*, _ArgTypes...>{typedef _Res (_Class::*_Functor)(_ArgTypes...);template<typename _Tp, typename... _Args>_Res_M_call(_Tp&& __object, const volatile _Class *,_Args&&... __args) const{return (std::forward<_Tp>(__object).*__pmf)(std::forward<_Args>(__args)...);}template<typename _Tp, typename... _Args>_Res_M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const{ return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }// Require each _Args to be convertible to corresponding _ArgTypestemplate<typename... _Args>using _RequireValidArgs= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;// Require each _Args to be convertible to corresponding _ArgTypes// and require _Tp is not _Class, _Class& or _Class*template<typename _Tp, typename... _Args>using _RequireValidArgs2= _Require<_NotSame<_Class, _Tp>, _NotSame<_Class*, _Tp>,_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;// Require each _Args to be convertible to corresponding _ArgTypes// and require _Tp is _Class or derived from _Classtemplate<typename _Tp, typename... _Args>using _RequireValidArgs3= _Require<is_base_of<_Class, _Tp>,_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;public:typedef _Res result_type;explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }// Handle objectstemplate<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>_Resoperator()(_Class& __object, _Args&&... __args) const{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>_Resoperator()(_Class&& __object, _Args&&... __args) const{return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);}// Handle pointerstemplate<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>_Resoperator()(_Class* __object, _Args&&... __args) const{ return (__object->*__pmf)(std::forward<_Args>(__args)...); }// Handle smart pointers, references and pointers to derivedtemplate<typename _Tp, typename... _Args,typename _Req = _RequireValidArgs2<_Tp, _Args...>>_Resoperator()(_Tp&& __object, _Args&&... __args) const{return _M_call(std::forward<_Tp>(__object), &__object,std::forward<_Args>(__args)...);}template<typename _Tp, typename... _Args,typename _Req = _RequireValidArgs3<_Tp, _Args...>>_Resoperator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }private:_Functor __pmf;};/// Implementation of @c mem_fn for const member function pointers.template<typename _Res, typename _Class, typename... _ArgTypes>class _Mem_fn<_Res (_Class::*)(_ArgTypes...) const>: public _Maybe_unary_or_binary_function<_Res, const _Class*,_ArgTypes...>{typedef _Res (_Class::*_Functor)(_ArgTypes...) const;template<typename _Tp, typename... _Args>_Res_M_call(_Tp&& __object, const volatile _Class *,_Args&&... __args) const{return (std::forward<_Tp>(__object).*__pmf)(std::forward<_Args>(__args)...);}template<typename _Tp, typename... _Args>_Res_M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const{ return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }template<typename... _Args>using _RequireValidArgs= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;template<typename _Tp, typename... _Args>using _RequireValidArgs2= _Require<_NotSame<_Class, _Tp>, _NotSame<_Class*, _Tp>,_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;template<typename _Tp, typename... _Args>using _RequireValidArgs3= _Require<is_base_of<_Class, _Tp>,_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;public:typedef _Res result_type;explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }// Handle objectstemplate<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>_Resoperator()(const _Class& __object, _Args&&... __args) const{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>_Resoperator()(const _Class&& __object, _Args&&... __args) const{return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);}// Handle pointerstemplate<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>_Resoperator()(const _Class* __object, _Args&&... __args) const{ return (__object->*__pmf)(std::forward<_Args>(__args)...); }// Handle smart pointers, references and pointers to derivedtemplate<typename _Tp, typename... _Args,typename _Req = _RequireValidArgs2<_Tp, _Args...>>_Res operator()(_Tp&& __object, _Args&&... __args) const{return _M_call(std::forward<_Tp>(__object), &__object,std::forward<_Args>(__args)...);}template<typename _Tp, typename... _Args,typename _Req = _RequireValidArgs3<_Tp, _Args...>>_Resoperator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }private:_Functor __pmf;};/// Implementation of @c mem_fn for volatile member function pointers.template<typename _Res, typename _Class, typename... _ArgTypes>class _Mem_fn<_Res (_Class::*)(_ArgTypes...) volatile>: public _Maybe_unary_or_binary_function<_Res, volatile _Class*,_ArgTypes...>{typedef _Res (_Class::*_Functor)(_ArgTypes...) volatile;template<typename _Tp, typename... _Args>_Res_M_call(_Tp&& __object, const volatile _Class *,_Args&&... __args) const{return (std::forward<_Tp>(__object).*__pmf)(std::forward<_Args>(__args)...);}template<typename _Tp, typename... _Args>_Res_M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const{ return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }template<typename... _Args>using _RequireValidArgs= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;template<typename _Tp, typename... _Args>using _RequireValidArgs2= _Require<_NotSame<_Class, _Tp>, _NotSame<_Class*, _Tp>,_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;template<typename _Tp, typename... _Args>using _RequireValidArgs3= _Require<is_base_of<_Class, _Tp>,_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;public:typedef _Res result_type;explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }// Handle objectstemplate<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>_Resoperator()(volatile _Class& __object, _Args&&... __args) const{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>_Resoperator()(volatile _Class&& __object, _Args&&... __args) const{return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);}// Handle pointerstemplate<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>_Resoperator()(volatile _Class* __object, _Args&&... __args) const{ return (__object->*__pmf)(std::forward<_Args>(__args)...); }// Handle smart pointers, references and pointers to derivedtemplate<typename _Tp, typename... _Args,typename _Req = _RequireValidArgs2<_Tp, _Args...>>_Resoperator()(_Tp&& __object, _Args&&... __args) const{return _M_call(std::forward<_Tp>(__object), &__object,std::forward<_Args>(__args)...);}template<typename _Tp, typename... _Args,typename _Req = _RequireValidArgs3<_Tp, _Args...>>_Resoperator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }private:_Functor __pmf;};/// Implementation of @c mem_fn for const volatile member function pointers.template<typename _Res, typename _Class, typename... _ArgTypes>class _Mem_fn<_Res (_Class::*)(_ArgTypes...) const volatile>: public _Maybe_unary_or_binary_function<_Res, const volatile _Class*,_ArgTypes...>{typedef _Res (_Class::*_Functor)(_ArgTypes...) const volatile;template<typename _Tp, typename... _Args>_Res_M_call(_Tp&& __object, const volatile _Class *,_Args&&... __args) const{return (std::forward<_Tp>(__object).*__pmf)(std::forward<_Args>(__args)...);}template<typename _Tp, typename... _Args>_Res_M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const{ return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }template<typename... _Args>using _RequireValidArgs= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;template<typename _Tp, typename... _Args>using _RequireValidArgs2= _Require<_NotSame<_Class, _Tp>, _NotSame<_Class*, _Tp>,_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;template<typename _Tp, typename... _Args>using _RequireValidArgs3= _Require<is_base_of<_Class, _Tp>,_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;public:typedef _Res result_type;explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }// Handle objectstemplate<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>_Resoperator()(const volatile _Class& __object, _Args&&... __args) const{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>_Resoperator()(const volatile _Class&& __object, _Args&&... __args) const{return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);}// Handle pointerstemplate<typename... _Args, typename _Req = _RequireValidArgs<_Args...>>_Resoperator()(const volatile _Class* __object, _Args&&... __args) const{ return (__object->*__pmf)(std::forward<_Args>(__args)...); }// Handle smart pointers, references and pointers to derivedtemplate<typename _Tp, typename... _Args,typename _Req = _RequireValidArgs2<_Tp, _Args...>>_Res operator()(_Tp&& __object, _Args&&... __args) const{return _M_call(std::forward<_Tp>(__object), &__object,std::forward<_Args>(__args)...);}template<typename _Tp, typename... _Args,typename _Req = _RequireValidArgs3<_Tp, _Args...>>_Resoperator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }private:_Functor __pmf;};template<typename _Tp, bool>struct _Mem_fn_const_or_non{typedef const _Tp& type;};template<typename _Tp>struct _Mem_fn_const_or_non<_Tp, false>{typedef _Tp& type;};template<typename _Res, typename _Class>class _Mem_fn<_Res _Class::*>{using __pm_type = _Res _Class::*;// This bit of genius is due to Peter Dimov, improved slightly by// Douglas Gregor.// Made less elegant to support perfect forwarding and noexcept.template<typename _Tp>auto_M_call(_Tp&& __object, const _Class *) const noexcept-> decltype(std::forward<_Tp>(__object).*std::declval<__pm_type&>()){ return std::forward<_Tp>(__object).*__pm; }template<typename _Tp, typename _Up>auto_M_call(_Tp&& __object, _Up * const *) const noexcept-> decltype((*std::forward<_Tp>(__object)).*std::declval<__pm_type&>()){ return (*std::forward<_Tp>(__object)).*__pm; }template<typename _Tp>auto_M_call(_Tp&& __ptr, const volatile void*) constnoexcept(noexcept((*__ptr).*std::declval<__pm_type&>()))-> decltype((*__ptr).*std::declval<__pm_type&>()){ return (*__ptr).*__pm; }public:explicit_Mem_fn(_Res _Class::*__pm) noexcept : __pm(__pm) { }// Handle objects_Res&operator()(_Class& __object) const noexcept{ return __object.*__pm; }const _Res&operator()(const _Class& __object) const noexcept{ return __object.*__pm; }_Res&&operator()(_Class&& __object) const noexcept{ return std::forward<_Class>(__object).*__pm; }const _Res&&operator()(const _Class&& __object) const noexcept{ return std::forward<const _Class>(__object).*__pm; }// Handle pointers_Res&operator()(_Class* __object) const noexcept{ return __object->*__pm; }const _Res&operator()(const _Class* __object) const noexcept{ return __object->*__pm; }// Handle smart pointers and derivedtemplate<typename _Tp, typename _Req = _Require<_NotSame<_Class*, _Tp>>>autooperator()(_Tp&& __unknown) constnoexcept(noexcept(std::declval<_Mem_fn*>()->_M_call(std::forward<_Tp>(__unknown), &__unknown)))-> decltype(this->_M_call(std::forward<_Tp>(__unknown), &__unknown)){ return _M_call(std::forward<_Tp>(__unknown), &__unknown); }template<typename _Tp, typename _Req = _Require<is_base_of<_Class, _Tp>>>autooperator()(reference_wrapper<_Tp> __ref) constnoexcept(noexcept(std::declval<_Mem_fn&>()(__ref.get())))-> decltype((*this)(__ref.get())){ return (*this)(__ref.get()); }private:_Res _Class::*__pm;};// _GLIBCXX_RESOLVE_LIB_DEFECTS// 2048. Unnecessary mem_fn overloads/*** @brief Returns a function object that forwards to the member* pointer @a pm.* @ingroup functors*/template<typename _Tp, typename _Class>inline _Mem_fn<_Tp _Class::*>mem_fn(_Tp _Class::* __pm) noexcept{return _Mem_fn<_Tp _Class::*>(__pm);}/*** @brief Determines if the given type _Tp is a function object* should be treated as a subexpression when evaluating calls to* function objects returned by bind(). [TR1 3.6.1]* @ingroup binders*/template<typename _Tp>struct is_bind_expression: public false_type { };/*** @brief Determines if the given type _Tp is a placeholder in a* bind() expression and, if so, which placeholder it is. [TR1 3.6.2]* @ingroup binders*/template<typename _Tp>struct is_placeholder: public integral_constant<int, 0>{ };/** @brief The type of placeholder objects defined by libstdc++.* @ingroup binders*/template<int _Num> struct _Placeholder { };_GLIBCXX_END_NAMESPACE_VERSION/** @namespace std::placeholders* @brief ISO C++11 entities sub-namespace for functional.* @ingroup binders*/namespace placeholders{_GLIBCXX_BEGIN_NAMESPACE_VERSION/* Define a large number of placeholders. There is no way to* simplify this with variadic templates, because we're introducing* unique names for each.*/extern const _Placeholder<1> _1;extern const _Placeholder<2> _2;extern const _Placeholder<3> _3;extern const _Placeholder<4> _4;extern const _Placeholder<5> _5;extern const _Placeholder<6> _6;extern const _Placeholder<7> _7;extern const _Placeholder<8> _8;extern const _Placeholder<9> _9;extern const _Placeholder<10> _10;extern const _Placeholder<11> _11;extern const _Placeholder<12> _12;extern const _Placeholder<13> _13;extern const _Placeholder<14> _14;extern const _Placeholder<15> _15;extern const _Placeholder<16> _16;extern const _Placeholder<17> _17;extern const _Placeholder<18> _18;extern const _Placeholder<19> _19;extern const _Placeholder<20> _20;extern const _Placeholder<21> _21;extern const _Placeholder<22> _22;extern const _Placeholder<23> _23;extern const _Placeholder<24> _24;extern const _Placeholder<25> _25;extern const _Placeholder<26> _26;extern const _Placeholder<27> _27;extern const _Placeholder<28> _28;extern const _Placeholder<29> _29;_GLIBCXX_END_NAMESPACE_VERSION}_GLIBCXX_BEGIN_NAMESPACE_VERSION/*** Partial specialization of is_placeholder that provides the placeholder* number for the placeholder objects defined by libstdc++.* @ingroup binders*/template<int _Num>struct is_placeholder<_Placeholder<_Num> >: public integral_constant<int, _Num>{ };template<int _Num>struct is_placeholder<const _Placeholder<_Num> >: public integral_constant<int, _Num>{ };/*** Used by _Safe_tuple_element to indicate that there is no tuple* element at this position.*/struct _No_tuple_element;/*** Implementation helper for _Safe_tuple_element. This primary* template handles the case where it is safe to use @c* tuple_element.*/template<std::size_t __i, typename _Tuple, bool _IsSafe>struct _Safe_tuple_element_impl: tuple_element<__i, _Tuple> { };/*** Implementation helper for _Safe_tuple_element. This partial* specialization handles the case where it is not safe to use @c* tuple_element. We just return @c _No_tuple_element.*/template<std::size_t __i, typename _Tuple>struct _Safe_tuple_element_impl<__i, _Tuple, false>{typedef _No_tuple_element type;};/*** Like tuple_element, but returns @c _No_tuple_element when* tuple_element would return an error.*/template<std::size_t __i, typename _Tuple>struct _Safe_tuple_element: _Safe_tuple_element_impl<__i, _Tuple,(__i < tuple_size<_Tuple>::value)>{ };/*** Maps an argument to bind() into an actual argument to the bound* function object [TR1 3.6.3/5]. Only the first parameter should* be specified: the rest are used to determine among the various* implementations. Note that, although this class is a function* object, it isn't entirely normal because it takes only two* parameters regardless of the number of parameters passed to the* bind expression. The first parameter is the bound argument and* the second parameter is a tuple containing references to the* rest of the arguments.*/template<typename _Arg,bool _IsBindExp = is_bind_expression<_Arg>::value,bool _IsPlaceholder = (is_placeholder<_Arg>::value > 0)>class _Mu;/*** If the argument is reference_wrapper<_Tp>, returns the* underlying reference. [TR1 3.6.3/5 bullet 1]*/template<typename _Tp>class _Mu<reference_wrapper<_Tp>, false, false>{public:typedef _Tp& result_type;/* Note: This won't actually work for const volatile* reference_wrappers, because reference_wrapper::get() is const* but not volatile-qualified. This might be a defect in the TR.*/template<typename _CVRef, typename _Tuple>result_typeoperator()(_CVRef& __arg, _Tuple&) const volatile{ return __arg.get(); }};/*** If the argument is a bind expression, we invoke the underlying* function object with the same cv-qualifiers as we are given and* pass along all of our arguments (unwrapped). [TR1 3.6.3/5 bullet 2]*/template<typename _Arg>class _Mu<_Arg, true, false>{public:template<typename _CVArg, typename... _Args>autooperator()(_CVArg& __arg,tuple<_Args...>& __tuple) const volatile-> decltype(__arg(declval<_Args>()...)){// Construct an index tuple and forward to __calltypedef typename _Build_index_tuple<sizeof...(_Args)>::__type_Indexes;return this->__call(__arg, __tuple, _Indexes());}private:// Invokes the underlying function object __arg by unpacking all// of the arguments in the tuple.template<typename _CVArg, typename... _Args, std::size_t... _Indexes>auto__call(_CVArg& __arg, tuple<_Args...>& __tuple,const _Index_tuple<_Indexes...>&) const volatile-> decltype(__arg(declval<_Args>()...)){return __arg(std::forward<_Args>(get<_Indexes>(__tuple))...);}};/*** If the argument is a placeholder for the Nth argument, returns* a reference to the Nth argument to the bind function object.* [TR1 3.6.3/5 bullet 3]*/template<typename _Arg>class _Mu<_Arg, false, true>{public:template<typename _Signature> class result;template<typename _CVMu, typename _CVArg, typename _Tuple>class result<_CVMu(_CVArg, _Tuple)>{// Add a reference, if it hasn't already been done for us.// This allows us to be a little bit sloppy in constructing// the tuple that we pass to result_of<...>.typedef typename _Safe_tuple_element<(is_placeholder<_Arg>::value- 1), _Tuple>::type__base_type;public:typedef typename add_rvalue_reference<__base_type>::type type;};template<typename _Tuple>typename result<_Mu(_Arg, _Tuple)>::typeoperator()(const volatile _Arg&, _Tuple& __tuple) const volatile{return std::forward<typename result<_Mu(_Arg, _Tuple)>::type>(::std::get<(is_placeholder<_Arg>::value - 1)>(__tuple));}};/*** If the argument is just a value, returns a reference to that* value. The cv-qualifiers on the reference are the same as the* cv-qualifiers on the _Mu object. [TR1 3.6.3/5 bullet 4]*/template<typename _Arg>class _Mu<_Arg, false, false>{public:template<typename _Signature> struct result;template<typename _CVMu, typename _CVArg, typename _Tuple>struct result<_CVMu(_CVArg, _Tuple)>{typedef typename add_lvalue_reference<_CVArg>::type type;};// Pick up the cv-qualifiers of the argumenttemplate<typename _CVArg, typename _Tuple>_CVArg&&operator()(_CVArg&& __arg, _Tuple&) const volatile{ return std::forward<_CVArg>(__arg); }};/*** Maps member pointers into instances of _Mem_fn but leaves all* other function objects untouched. Used by tr1::bind(). The* primary template handles the non--member-pointer case.*/template<typename _Tp>struct _Maybe_wrap_member_pointer{typedef _Tp type;static const _Tp&__do_wrap(const _Tp& __x){ return __x; }static _Tp&&__do_wrap(_Tp&& __x){ return static_cast<_Tp&&>(__x); }};/*** Maps member pointers into instances of _Mem_fn but leaves all* other function objects untouched. Used by tr1::bind(). This* partial specialization handles the member pointer case.*/template<typename _Tp, typename _Class>struct _Maybe_wrap_member_pointer<_Tp _Class::*>{typedef _Mem_fn<_Tp _Class::*> type;static type__do_wrap(_Tp _Class::* __pm){ return type(__pm); }};// Specialization needed to prevent "forming reference to void" errors when// bind<void>() is called, because argument deduction instantiates// _Maybe_wrap_member_pointer<void> outside the immediate context where// SFINAE applies.template<>struct _Maybe_wrap_member_pointer<void>{typedef void type;};// std::get<I> for volatile-qualified tuplestemplate<std::size_t _Ind, typename... _Tp>inline auto__volget(volatile tuple<_Tp...>& __tuple)-> typename tuple_element<_Ind, tuple<_Tp...>>::type volatile&{ return std::get<_Ind>(const_cast<tuple<_Tp...>&>(__tuple)); }// std::get<I> for const-volatile-qualified tuplestemplate<std::size_t _Ind, typename... _Tp>inline auto__volget(const volatile tuple<_Tp...>& __tuple)-> typename tuple_element<_Ind, tuple<_Tp...>>::type const volatile&{ return std::get<_Ind>(const_cast<const tuple<_Tp...>&>(__tuple)); }/// Type of the function object returned from bind().template<typename _Signature>struct _Bind;template<typename _Functor, typename... _Bound_args>class _Bind<_Functor(_Bound_args...)>: public _Weak_result_type<_Functor>{typedef _Bind __self_type;typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type_Bound_indexes;_Functor _M_f;tuple<_Bound_args...> _M_bound_args;// Call unqualifiedtemplate<typename _Result, typename... _Args, std::size_t... _Indexes>_Result__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>){return _M_f(_Mu<_Bound_args>()(get<_Indexes>(_M_bound_args), __args)...);}// Call as consttemplate<typename _Result, typename... _Args, std::size_t... _Indexes>_Result__call_c(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) const{return _M_f(_Mu<_Bound_args>()(get<_Indexes>(_M_bound_args), __args)...);}// Call as volatiletemplate<typename _Result, typename... _Args, std::size_t... _Indexes>_Result__call_v(tuple<_Args...>&& __args,_Index_tuple<_Indexes...>) volatile{return _M_f(_Mu<_Bound_args>()(__volget<_Indexes>(_M_bound_args), __args)...);}// Call as const volatiletemplate<typename _Result, typename... _Args, std::size_t... _Indexes>_Result__call_c_v(tuple<_Args...>&& __args,_Index_tuple<_Indexes...>) const volatile{return _M_f(_Mu<_Bound_args>()(__volget<_Indexes>(_M_bound_args), __args)...);}public:template<typename... _Args>explicit _Bind(const _Functor& __f, _Args&&... __args): _M_f(__f), _M_bound_args(std::forward<_Args>(__args)...){ }template<typename... _Args>explicit _Bind(_Functor&& __f, _Args&&... __args): _M_f(std::move(__f)), _M_bound_args(std::forward<_Args>(__args)...){ }_Bind(const _Bind&) = default;_Bind(_Bind&& __b): _M_f(std::move(__b._M_f)), _M_bound_args(std::move(__b._M_bound_args)){ }// Call unqualifiedtemplate<typename... _Args, typename _Result= decltype( std::declval<_Functor>()(_Mu<_Bound_args>()( std::declval<_Bound_args&>(),std::declval<tuple<_Args...>&>() )... ) )>_Resultoperator()(_Args&&... __args){return this->__call<_Result>(std::forward_as_tuple(std::forward<_Args>(__args)...),_Bound_indexes());}// Call as consttemplate<typename... _Args, typename _Result= decltype( std::declval<typename enable_if<(sizeof...(_Args) >= 0),typename add_const<_Functor>::type>::type>()(_Mu<_Bound_args>()( std::declval<const _Bound_args&>(),std::declval<tuple<_Args...>&>() )... ) )>_Resultoperator()(_Args&&... __args) const{return this->__call_c<_Result>(std::forward_as_tuple(std::forward<_Args>(__args)...),_Bound_indexes());}// Call as volatiletemplate<typename... _Args, typename _Result= decltype( std::declval<typename enable_if<(sizeof...(_Args) >= 0),typename add_volatile<_Functor>::type>::type>()(_Mu<_Bound_args>()( std::declval<volatile _Bound_args&>(),std::declval<tuple<_Args...>&>() )... ) )>_Resultoperator()(_Args&&... __args) volatile{return this->__call_v<_Result>(std::forward_as_tuple(std::forward<_Args>(__args)...),_Bound_indexes());}// Call as const volatiletemplate<typename... _Args, typename _Result= decltype( std::declval<typename enable_if<(sizeof...(_Args) >= 0),typename add_cv<_Functor>::type>::type>()(_Mu<_Bound_args>()( std::declval<const volatile _Bound_args&>(),std::declval<tuple<_Args...>&>() )... ) )>_Resultoperator()(_Args&&... __args) const volatile{return this->__call_c_v<_Result>(std::forward_as_tuple(std::forward<_Args>(__args)...),_Bound_indexes());}};/// Type of the function object returned from bind<R>().template<typename _Result, typename _Signature>struct _Bind_result;template<typename _Result, typename _Functor, typename... _Bound_args>class _Bind_result<_Result, _Functor(_Bound_args...)>{typedef _Bind_result __self_type;typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type_Bound_indexes;_Functor _M_f;tuple<_Bound_args...> _M_bound_args;// sfinae typestemplate<typename _Res>struct __enable_if_void : enable_if<is_void<_Res>::value, int> { };template<typename _Res>struct __disable_if_void : enable_if<!is_void<_Res>::value, int> { };// Call unqualifiedtemplate<typename _Res, typename... _Args, std::size_t... _Indexes>_Result__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,typename __disable_if_void<_Res>::type = 0){return _M_f(_Mu<_Bound_args>()(get<_Indexes>(_M_bound_args), __args)...);}// Call unqualified, return voidtemplate<typename _Res, typename... _Args, std::size_t... _Indexes>void__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,typename __enable_if_void<_Res>::type = 0){_M_f(_Mu<_Bound_args>()(get<_Indexes>(_M_bound_args), __args)...);}// Call as consttemplate<typename _Res, typename... _Args, std::size_t... _Indexes>_Result__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,typename __disable_if_void<_Res>::type = 0) const{return _M_f(_Mu<_Bound_args>()(get<_Indexes>(_M_bound_args), __args)...);}// Call as const, return voidtemplate<typename _Res, typename... _Args, std::size_t... _Indexes>void__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,typename __enable_if_void<_Res>::type = 0) const{_M_f(_Mu<_Bound_args>()(get<_Indexes>(_M_bound_args), __args)...);}// Call as volatiletemplate<typename _Res, typename... _Args, std::size_t... _Indexes>_Result__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,typename __disable_if_void<_Res>::type = 0) volatile{return _M_f(_Mu<_Bound_args>()(__volget<_Indexes>(_M_bound_args), __args)...);}// Call as volatile, return voidtemplate<typename _Res, typename... _Args, std::size_t... _Indexes>void__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,typename __enable_if_void<_Res>::type = 0) volatile{_M_f(_Mu<_Bound_args>()(__volget<_Indexes>(_M_bound_args), __args)...);}// Call as const volatiletemplate<typename _Res, typename... _Args, std::size_t... _Indexes>_Result__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,typename __disable_if_void<_Res>::type = 0) const volatile{return _M_f(_Mu<_Bound_args>()(__volget<_Indexes>(_M_bound_args), __args)...);}// Call as const volatile, return voidtemplate<typename _Res, typename... _Args, std::size_t... _Indexes>void__call(tuple<_Args...>&& __args,_Index_tuple<_Indexes...>,typename __enable_if_void<_Res>::type = 0) const volatile{_M_f(_Mu<_Bound_args>()(__volget<_Indexes>(_M_bound_args), __args)...);}public:typedef _Result result_type;template<typename... _Args>explicit _Bind_result(const _Functor& __f, _Args&&... __args): _M_f(__f), _M_bound_args(std::forward<_Args>(__args)...){ }template<typename... _Args>explicit _Bind_result(_Functor&& __f, _Args&&... __args): _M_f(std::move(__f)), _M_bound_args(std::forward<_Args>(__args)...){ }_Bind_result(const _Bind_result&) = default;_Bind_result(_Bind_result&& __b): _M_f(std::move(__b._M_f)), _M_bound_args(std::move(__b._M_bound_args)){ }// Call unqualifiedtemplate<typename... _Args>result_typeoperator()(_Args&&... __args){return this->__call<_Result>(std::forward_as_tuple(std::forward<_Args>(__args)...),_Bound_indexes());}// Call as consttemplate<typename... _Args>result_typeoperator()(_Args&&... __args) const{return this->__call<_Result>(std::forward_as_tuple(std::forward<_Args>(__args)...),_Bound_indexes());}// Call as volatiletemplate<typename... _Args>result_typeoperator()(_Args&&... __args) volatile{return this->__call<_Result>(std::forward_as_tuple(std::forward<_Args>(__args)...),_Bound_indexes());}// Call as const volatiletemplate<typename... _Args>result_typeoperator()(_Args&&... __args) const volatile{return this->__call<_Result>(std::forward_as_tuple(std::forward<_Args>(__args)...),_Bound_indexes());}};/*** @brief Class template _Bind is always a bind expression.* @ingroup binders*/template<typename _Signature>struct is_bind_expression<_Bind<_Signature> >: public true_type { };/*** @brief Class template _Bind is always a bind expression.* @ingroup binders*/template<typename _Signature>struct is_bind_expression<const _Bind<_Signature> >: public true_type { };/*** @brief Class template _Bind is always a bind expression.* @ingroup binders*/template<typename _Signature>struct is_bind_expression<volatile _Bind<_Signature> >: public true_type { };/*** @brief Class template _Bind is always a bind expression.* @ingroup binders*/template<typename _Signature>struct is_bind_expression<const volatile _Bind<_Signature>>: public true_type { };/*** @brief Class template _Bind_result is always a bind expression.* @ingroup binders*/template<typename _Result, typename _Signature>struct is_bind_expression<_Bind_result<_Result, _Signature>>: public true_type { };/*** @brief Class template _Bind_result is always a bind expression.* @ingroup binders*/template<typename _Result, typename _Signature>struct is_bind_expression<const _Bind_result<_Result, _Signature>>: public true_type { };/*** @brief Class template _Bind_result is always a bind expression.* @ingroup binders*/template<typename _Result, typename _Signature>struct is_bind_expression<volatile _Bind_result<_Result, _Signature>>: public true_type { };/*** @brief Class template _Bind_result is always a bind expression.* @ingroup binders*/template<typename _Result, typename _Signature>struct is_bind_expression<const volatile _Bind_result<_Result, _Signature>>: public true_type { };// Trait type used to remove std::bind() from overload set via SFINAE// when first argument has integer type, so that std::bind() will// not be a better match than ::bind() from the BSD Sockets API.template<typename _Tp, typename _Tp2 = typename decay<_Tp>::type>using __is_socketlike = __or_<is_integral<_Tp2>, is_enum<_Tp2>>;template<bool _SocketLike, typename _Func, typename... _BoundArgs>struct _Bind_helper{typedef _Maybe_wrap_member_pointer<typename decay<_Func>::type>__maybe_type;typedef typename __maybe_type::type __func_type;typedef _Bind<__func_type(typename decay<_BoundArgs>::type...)> type;};// Partial specialization for is_socketlike == true, does not define// nested type so std::bind() will not participate in overload resolution// when the first argument might be a socket file descriptor.template<typename _Func, typename... _BoundArgs>struct _Bind_helper<true, _Func, _BoundArgs...>{ };/*** @brief Function template for std::bind.* @ingroup binders*/template<typename _Func, typename... _BoundArgs>inline typename_Bind_helper<__is_socketlike<_Func>::value, _Func, _BoundArgs...>::typebind(_Func&& __f, _BoundArgs&&... __args){typedef _Bind_helper<false, _Func, _BoundArgs...> __helper_type;typedef typename __helper_type::__maybe_type __maybe_type;typedef typename __helper_type::type __result_type;return __result_type(__maybe_type::__do_wrap(std::forward<_Func>(__f)),std::forward<_BoundArgs>(__args)...);}template<typename _Result, typename _Func, typename... _BoundArgs>struct _Bindres_helper{typedef _Maybe_wrap_member_pointer<typename decay<_Func>::type>__maybe_type;typedef typename __maybe_type::type __functor_type;typedef _Bind_result<_Result,__functor_type(typename decay<_BoundArgs>::type...)>type;};/*** @brief Function template for std::bind<R>.* @ingroup binders*/template<typename _Result, typename _Func, typename... _BoundArgs>inlinetypename _Bindres_helper<_Result, _Func, _BoundArgs...>::typebind(_Func&& __f, _BoundArgs&&... __args){typedef _Bindres_helper<_Result, _Func, _BoundArgs...> __helper_type;typedef typename __helper_type::__maybe_type __maybe_type;typedef typename __helper_type::type __result_type;return __result_type(__maybe_type::__do_wrap(std::forward<_Func>(__f)),std::forward<_BoundArgs>(__args)...);}template<typename _Signature>struct _Bind_simple;template<typename _Callable, typename... _Args>struct _Bind_simple<_Callable(_Args...)>{typedef typename result_of<_Callable(_Args...)>::type result_type;template<typename... _Args2, typename = typenameenable_if< sizeof...(_Args) == sizeof...(_Args2)>::type>explicit_Bind_simple(const _Callable& __callable, _Args2&&... __args): _M_bound(__callable, std::forward<_Args2>(__args)...){ }template<typename... _Args2, typename = typenameenable_if< sizeof...(_Args) == sizeof...(_Args2)>::type>explicit_Bind_simple(_Callable&& __callable, _Args2&&... __args): _M_bound(std::move(__callable), std::forward<_Args2>(__args)...){ }_Bind_simple(const _Bind_simple&) = default;_Bind_simple(_Bind_simple&&) = default;result_typeoperator()(){typedef typename _Build_index_tuple<sizeof...(_Args)>::__type _Indices;return _M_invoke(_Indices());}private:template<std::size_t... _Indices>typename result_of<_Callable(_Args...)>::type_M_invoke(_Index_tuple<_Indices...>){// std::bind always forwards bound arguments as lvalues,// but this type can call functions which only accept rvalues.return std::forward<_Callable>(std::get<0>(_M_bound))(std::forward<_Args>(std::get<_Indices+1>(_M_bound))...);}std::tuple<_Callable, _Args...> _M_bound;};template<typename _Func, typename... _BoundArgs>struct _Bind_simple_helper{typedef _Maybe_wrap_member_pointer<typename decay<_Func>::type>__maybe_type;typedef typename __maybe_type::type __func_type;typedef _Bind_simple<__func_type(typename decay<_BoundArgs>::type...)>__type;};// Simplified version of std::bind for internal use, without support for// unbound arguments, placeholders or nested bind expressions.template<typename _Callable, typename... _Args>typename _Bind_simple_helper<_Callable, _Args...>::__type__bind_simple(_Callable&& __callable, _Args&&... __args){typedef _Bind_simple_helper<_Callable, _Args...> __helper_type;typedef typename __helper_type::__maybe_type __maybe_type;typedef typename __helper_type::__type __result_type;return __result_type(__maybe_type::__do_wrap( std::forward<_Callable>(__callable)),std::forward<_Args>(__args)...);}/*** @brief Exception class thrown when class template function's* operator() is called with an empty target.* @ingroup exceptions*/class bad_function_call : public std::exception{public:virtual ~bad_function_call() noexcept;};/*** Trait identifying "location-invariant" types, meaning that the* address of the object (or any of its members) will not escape.* Also implies a trivial copy constructor and assignment operator.*/template<typename _Tp>struct __is_location_invariant: integral_constant<bool, (is_pointer<_Tp>::value|| is_member_pointer<_Tp>::value)>{ };class _Undefined_class;union _Nocopy_types{void* _M_object;const void* _M_const_object;void (*_M_function_pointer)();void (_Undefined_class::*_M_member_pointer)();};union _Any_data{void* _M_access() { return &_M_pod_data[0]; }const void* _M_access() const { return &_M_pod_data[0]; }template<typename _Tp>_Tp&_M_access(){ return *static_cast<_Tp*>(_M_access()); }template<typename _Tp>const _Tp&_M_access() const{ return *static_cast<const _Tp*>(_M_access()); }_Nocopy_types _M_unused;char _M_pod_data[sizeof(_Nocopy_types)];};enum _Manager_operation{__get_type_info,__get_functor_ptr,__clone_functor,__destroy_functor};// Simple type wrapper that helps avoid annoying const problems// when casting between void pointers and pointers-to-pointers.template<typename _Tp>struct _Simple_type_wrapper{_Simple_type_wrapper(_Tp __value) : __value(__value) { }_Tp __value;};template<typename _Tp>struct __is_location_invariant<_Simple_type_wrapper<_Tp> >: __is_location_invariant<_Tp>{ };// Converts a reference to a function object into a callable// function object.template<typename _Functor>inline _Functor&__callable_functor(_Functor& __f){ return __f; }template<typename _Member, typename _Class>inline _Mem_fn<_Member _Class::*>__callable_functor(_Member _Class::* &__p){ return std::mem_fn(__p); }template<typename _Member, typename _Class>inline _Mem_fn<_Member _Class::*>__callable_functor(_Member _Class::* const &__p){ return std::mem_fn(__p); }template<typename _Member, typename _Class>inline _Mem_fn<_Member _Class::*>__callable_functor(_Member _Class::* volatile &__p){ return std::mem_fn(__p); }template<typename _Member, typename _Class>inline _Mem_fn<_Member _Class::*>__callable_functor(_Member _Class::* const volatile &__p){ return std::mem_fn(__p); }template<typename _Signature>class function;/// Base class of all polymorphic function object wrappers.class _Function_base{public:static const std::size_t _M_max_size = sizeof(_Nocopy_types);static const std::size_t _M_max_align = __alignof__(_Nocopy_types);template<typename _Functor>class _Base_manager{protected:static const bool __stored_locally =(__is_location_invariant<_Functor>::value&& sizeof(_Functor) <= _M_max_size&& __alignof__(_Functor) <= _M_max_align&& (_M_max_align % __alignof__(_Functor) == 0));typedef integral_constant<bool, __stored_locally> _Local_storage;// Retrieve a pointer to the function objectstatic _Functor*_M_get_pointer(const _Any_data& __source){const _Functor* __ptr =__stored_locally? std::__addressof(__source._M_access<_Functor>())/* have stored a pointer */ : __source._M_access<_Functor*>();return const_cast<_Functor*>(__ptr);}// Clone a location-invariant function object that fits within// an _Any_data structure.static void_M_clone(_Any_data& __dest, const _Any_data& __source, true_type){new (__dest._M_access()) _Functor(__source._M_access<_Functor>());}// Clone a function object that is not location-invariant or// that cannot fit into an _Any_data structure.static void_M_clone(_Any_data& __dest, const _Any_data& __source, false_type){__dest._M_access<_Functor*>() =new _Functor(*__source._M_access<_Functor*>());}// Destroying a location-invariant object may still require// destruction.static void_M_destroy(_Any_data& __victim, true_type){__victim._M_access<_Functor>().~_Functor();}// Destroying an object located on the heap.static void_M_destroy(_Any_data& __victim, false_type){delete __victim._M_access<_Functor*>();}public:static bool_M_manager(_Any_data& __dest, const _Any_data& __source,_Manager_operation __op){switch (__op){#ifdef __GXX_RTTIcase __get_type_info:__dest._M_access<const type_info*>() = &typeid(_Functor);break;#endifcase __get_functor_ptr:__dest._M_access<_Functor*>() = _M_get_pointer(__source);break;case __clone_functor:_M_clone(__dest, __source, _Local_storage());break;case __destroy_functor:_M_destroy(__dest, _Local_storage());break;}return false;}static void_M_init_functor(_Any_data& __functor, _Functor&& __f){ _M_init_functor(__functor, std::move(__f), _Local_storage()); }template<typename _Signature>static bool_M_not_empty_function(const function<_Signature>& __f){ return static_cast<bool>(__f); }template<typename _Tp>static bool_M_not_empty_function(const _Tp*& __fp){ return __fp; }template<typename _Class, typename _Tp>static bool_M_not_empty_function(_Tp _Class::* const& __mp){ return __mp; }template<typename _Tp>static bool_M_not_empty_function(const _Tp&){ return true; }private:static void_M_init_functor(_Any_data& __functor, _Functor&& __f, true_type){ new (__functor._M_access()) _Functor(std::move(__f)); }static void_M_init_functor(_Any_data& __functor, _Functor&& __f, false_type){ __functor._M_access<_Functor*>() = new _Functor(std::move(__f)); }};template<typename _Functor>class _Ref_manager : public _Base_manager<_Functor*>{typedef _Function_base::_Base_manager<_Functor*> _Base;public:static bool_M_manager(_Any_data& __dest, const _Any_data& __source,_Manager_operation __op){switch (__op){#ifdef __GXX_RTTIcase __get_type_info:__dest._M_access<const type_info*>() = &typeid(_Functor);break;#endifcase __get_functor_ptr:__dest._M_access<_Functor*>() = *_Base::_M_get_pointer(__source);return is_const<_Functor>::value;break;default:_Base::_M_manager(__dest, __source, __op);}return false;}static void_M_init_functor(_Any_data& __functor, reference_wrapper<_Functor> __f){_Base::_M_init_functor(__functor, std::__addressof(__f.get()));}};_Function_base() : _M_manager(0) { }~_Function_base(){if (_M_manager)_M_manager(_M_functor, _M_functor, __destroy_functor);}bool _M_empty() const { return !_M_manager; }typedef bool (*_Manager_type)(_Any_data&, const _Any_data&,_Manager_operation);_Any_data _M_functor;_Manager_type _M_manager;};template<typename _Signature, typename _Functor>class _Function_handler;template<typename _Res, typename _Functor, typename... _ArgTypes>class _Function_handler<_Res(_ArgTypes...), _Functor>: public _Function_base::_Base_manager<_Functor>{typedef _Function_base::_Base_manager<_Functor> _Base;public:static _Res_M_invoke(const _Any_data& __functor, _ArgTypes... __args){return (*_Base::_M_get_pointer(__functor))(std::forward<_ArgTypes>(__args)...);}};template<typename _Functor, typename... _ArgTypes>class _Function_handler<void(_ArgTypes...), _Functor>: public _Function_base::_Base_manager<_Functor>{typedef _Function_base::_Base_manager<_Functor> _Base;public:static void_M_invoke(const _Any_data& __functor, _ArgTypes... __args){(*_Base::_M_get_pointer(__functor))(std::forward<_ArgTypes>(__args)...);}};template<typename _Res, typename _Functor, typename... _ArgTypes>class _Function_handler<_Res(_ArgTypes...), reference_wrapper<_Functor> >: public _Function_base::_Ref_manager<_Functor>{typedef _Function_base::_Ref_manager<_Functor> _Base;public:static _Res_M_invoke(const _Any_data& __functor, _ArgTypes... __args){return __callable_functor(**_Base::_M_get_pointer(__functor))(std::forward<_ArgTypes>(__args)...);}};template<typename _Functor, typename... _ArgTypes>class _Function_handler<void(_ArgTypes...), reference_wrapper<_Functor> >: public _Function_base::_Ref_manager<_Functor>{typedef _Function_base::_Ref_manager<_Functor> _Base;public:static void_M_invoke(const _Any_data& __functor, _ArgTypes... __args){__callable_functor(**_Base::_M_get_pointer(__functor))(std::forward<_ArgTypes>(__args)...);}};template<typename _Class, typename _Member, typename _Res,typename... _ArgTypes>class _Function_handler<_Res(_ArgTypes...), _Member _Class::*>: public _Function_handler<void(_ArgTypes...), _Member _Class::*>{typedef _Function_handler<void(_ArgTypes...), _Member _Class::*>_Base;public:static _Res_M_invoke(const _Any_data& __functor, _ArgTypes... __args){return std::mem_fn(_Base::_M_get_pointer(__functor)->__value)(std::forward<_ArgTypes>(__args)...);}};template<typename _Class, typename _Member, typename... _ArgTypes>class _Function_handler<void(_ArgTypes...), _Member _Class::*>: public _Function_base::_Base_manager<_Simple_type_wrapper< _Member _Class::* > >{typedef _Member _Class::* _Functor;typedef _Simple_type_wrapper<_Functor> _Wrapper;typedef _Function_base::_Base_manager<_Wrapper> _Base;public:static bool_M_manager(_Any_data& __dest, const _Any_data& __source,_Manager_operation __op){switch (__op){#ifdef __GXX_RTTIcase __get_type_info:__dest._M_access<const type_info*>() = &typeid(_Functor);break;#endifcase __get_functor_ptr:__dest._M_access<_Functor*>() =&_Base::_M_get_pointer(__source)->__value;break;default:_Base::_M_manager(__dest, __source, __op);}return false;}static void_M_invoke(const _Any_data& __functor, _ArgTypes... __args){std::mem_fn(_Base::_M_get_pointer(__functor)->__value)(std::forward<_ArgTypes>(__args)...);}};/*** @brief Primary class template for std::function.* @ingroup functors** Polymorphic function wrapper.*/template<typename _Res, typename... _ArgTypes>class function<_Res(_ArgTypes...)>: public _Maybe_unary_or_binary_function<_Res, _ArgTypes...>,private _Function_base{typedef _Res _Signature_type(_ArgTypes...);template<typename _Functor>using _Invoke = decltype(__callable_functor(std::declval<_Functor&>())(std::declval<_ArgTypes>()...) );template<typename _CallRes, typename _Res1>struct _CheckResult: is_convertible<_CallRes, _Res1> { };template<typename _CallRes>struct _CheckResult<_CallRes, void>: true_type { };template<typename _Functor>using _Callable = _CheckResult<_Invoke<_Functor>, _Res>;template<typename _Cond, typename _Tp>using _Requires = typename enable_if<_Cond::value, _Tp>::type;public:typedef _Res result_type;// [3.7.2.1] construct/copy/destroy/*** @brief Default construct creates an empty function call wrapper.* @post @c !(bool)*this*/function() noexcept: _Function_base() { }/*** @brief Creates an empty function call wrapper.* @post @c !(bool)*this*/function(nullptr_t) noexcept: _Function_base() { }/*** @brief %Function copy constructor.* @param __x A %function object with identical call signature.* @post @c bool(*this) == bool(__x)** The newly-created %function contains a copy of the target of @a* __x (if it has one).*/function(const function& __x);/*** @brief %Function move constructor.* @param __x A %function object rvalue with identical call signature.** The newly-created %function contains the target of @a __x* (if it has one).*/function(function&& __x) : _Function_base(){__x.swap(*this);}// TODO: needs allocator_arg_t/*** @brief Builds a %function that targets a copy of the incoming* function object.* @param __f A %function object that is callable with parameters of* type @c T1, @c T2, ..., @c TN and returns a value convertible* to @c Res.** The newly-created %function object will target a copy of* @a __f. If @a __f is @c reference_wrapper<F>, then this function* object will contain a reference to the function object @c* __f.get(). If @a __f is a NULL function pointer or NULL* pointer-to-member, the newly-created object will be empty.** If @a __f is a non-NULL function pointer or an object of type @c* reference_wrapper<F>, this function will not throw.*/template<typename _Functor,typename = _Requires<_Callable<_Functor>, void>>function(_Functor);/*** @brief %Function assignment operator.* @param __x A %function with identical call signature.* @post @c (bool)*this == (bool)x* @returns @c *this** The target of @a __x is copied to @c *this. If @a __x has no* target, then @c *this will be empty.** If @a __x targets a function pointer or a reference to a function* object, then this operation will not throw an %exception.*/function&operator=(const function& __x){function(__x).swap(*this);return *this;}/*** @brief %Function move-assignment operator.* @param __x A %function rvalue with identical call signature.* @returns @c *this** The target of @a __x is moved to @c *this. If @a __x has no* target, then @c *this will be empty.** If @a __x targets a function pointer or a reference to a function* object, then this operation will not throw an %exception.*/function&operator=(function&& __x){function(std::move(__x)).swap(*this);return *this;}/*** @brief %Function assignment to zero.* @post @c !(bool)*this* @returns @c *this** The target of @c *this is deallocated, leaving it empty.*/function&operator=(nullptr_t){if (_M_manager){_M_manager(_M_functor, _M_functor, __destroy_functor);_M_manager = 0;_M_invoker = 0;}return *this;}/*** @brief %Function assignment to a new target.* @param __f A %function object that is callable with parameters of* type @c T1, @c T2, ..., @c TN and returns a value convertible* to @c Res.* @return @c *this** This %function object wrapper will target a copy of @a* __f. If @a __f is @c reference_wrapper<F>, then this function* object will contain a reference to the function object @c* __f.get(). If @a __f is a NULL function pointer or NULL* pointer-to-member, @c this object will be empty.** If @a __f is a non-NULL function pointer or an object of type @c* reference_wrapper<F>, this function will not throw.*/template<typename _Functor>_Requires<_Callable<_Functor>, function&>operator=(_Functor&& __f){function(std::forward<_Functor>(__f)).swap(*this);return *this;}/// @overloadtemplate<typename _Functor>function&operator=(reference_wrapper<_Functor> __f) noexcept{function(__f).swap(*this);return *this;}// [3.7.2.2] function modifiers/*** @brief Swap the targets of two %function objects.* @param __x A %function with identical call signature.** Swap the targets of @c this function object and @a __f. This* function will not throw an %exception.*/void swap(function& __x){std::swap(_M_functor, __x._M_functor);std::swap(_M_manager, __x._M_manager);std::swap(_M_invoker, __x._M_invoker);}// TODO: needs allocator_arg_t/*template<typename _Functor, typename _Alloc>voidassign(_Functor&& __f, const _Alloc& __a){function(allocator_arg, __a,std::forward<_Functor>(__f)).swap(*this);}*/// [3.7.2.3] function capacity/*** @brief Determine if the %function wrapper has a target.** @return @c true when this %function object contains a target,* or @c false when it is empty.** This function will not throw an %exception.*/explicit operator bool() const noexcept{ return !_M_empty(); }// [3.7.2.4] function invocation/*** @brief Invokes the function targeted by @c *this.* @returns the result of the target.* @throws bad_function_call when @c !(bool)*this** The function call operator invokes the target function object* stored by @c this.*/_Res operator()(_ArgTypes... __args) const;#ifdef __GXX_RTTI// [3.7.2.5] function target access/*** @brief Determine the type of the target of this function object* wrapper.** @returns the type identifier of the target function object, or* @c typeid(void) if @c !(bool)*this.** This function will not throw an %exception.*/const type_info& target_type() const noexcept;/*** @brief Access the stored target function object.** @return Returns a pointer to the stored target function object,* if @c typeid(Functor).equals(target_type()); otherwise, a NULL* pointer.** This function will not throw an %exception.*/template<typename _Functor> _Functor* target() noexcept;/// @overloadtemplate<typename _Functor> const _Functor* target() const noexcept;#endifprivate:typedef _Res (*_Invoker_type)(const _Any_data&, _ArgTypes...);_Invoker_type _M_invoker;};// Out-of-line member definitions.template<typename _Res, typename... _ArgTypes>function<_Res(_ArgTypes...)>::function(const function& __x): _Function_base(){if (static_cast<bool>(__x)){_M_invoker = __x._M_invoker;_M_manager = __x._M_manager;__x._M_manager(_M_functor, __x._M_functor, __clone_functor);}}template<typename _Res, typename... _ArgTypes>template<typename _Functor, typename>function<_Res(_ArgTypes...)>::function(_Functor __f): _Function_base(){typedef _Function_handler<_Signature_type, _Functor> _My_handler;if (_My_handler::_M_not_empty_function(__f)){_My_handler::_M_init_functor(_M_functor, std::move(__f));_M_invoker = &_My_handler::_M_invoke;_M_manager = &_My_handler::_M_manager;}}template<typename _Res, typename... _ArgTypes>_Resfunction<_Res(_ArgTypes...)>::operator()(_ArgTypes... __args) const{if (_M_empty())__throw_bad_function_call();return _M_invoker(_M_functor, std::forward<_ArgTypes>(__args)...);}#ifdef __GXX_RTTItemplate<typename _Res, typename... _ArgTypes>const type_info&function<_Res(_ArgTypes...)>::target_type() const noexcept{if (_M_manager){_Any_data __typeinfo_result;_M_manager(__typeinfo_result, _M_functor, __get_type_info);return *__typeinfo_result._M_access<const type_info*>();}elsereturn typeid(void);}template<typename _Res, typename... _ArgTypes>template<typename _Functor>_Functor*function<_Res(_ArgTypes...)>::target() noexcept{if (typeid(_Functor) == target_type() && _M_manager){_Any_data __ptr;if (_M_manager(__ptr, _M_functor, __get_functor_ptr)&& !is_const<_Functor>::value)return 0;elsereturn __ptr._M_access<_Functor*>();}elsereturn 0;}template<typename _Res, typename... _ArgTypes>template<typename _Functor>const _Functor*function<_Res(_ArgTypes...)>::target() const noexcept{if (typeid(_Functor) == target_type() && _M_manager){_Any_data __ptr;_M_manager(__ptr, _M_functor, __get_functor_ptr);return __ptr._M_access<const _Functor*>();}elsereturn 0;}#endif// [20.7.15.2.6] null pointer comparisons/*** @brief Compares a polymorphic function object wrapper against 0* (the NULL pointer).* @returns @c true if the wrapper has no target, @c false otherwise** This function will not throw an %exception.*/template<typename _Res, typename... _Args>inline booloperator==(const function<_Res(_Args...)>& __f, nullptr_t) noexcept{ return !static_cast<bool>(__f); }/// @overloadtemplate<typename _Res, typename... _Args>inline booloperator==(nullptr_t, const function<_Res(_Args...)>& __f) noexcept{ return !static_cast<bool>(__f); }/*** @brief Compares a polymorphic function object wrapper against 0* (the NULL pointer).* @returns @c false if the wrapper has no target, @c true otherwise** This function will not throw an %exception.*/template<typename _Res, typename... _Args>inline booloperator!=(const function<_Res(_Args...)>& __f, nullptr_t) noexcept{ return static_cast<bool>(__f); }/// @overloadtemplate<typename _Res, typename... _Args>inline booloperator!=(nullptr_t, const function<_Res(_Args...)>& __f) noexcept{ return static_cast<bool>(__f); }// [20.7.15.2.7] specialized algorithms/*** @brief Swap the targets of two polymorphic function object wrappers.** This function will not throw an %exception.*/template<typename _Res, typename... _Args>inline voidswap(function<_Res(_Args...)>& __x, function<_Res(_Args...)>& __y){ __x.swap(__y); }_GLIBCXX_END_NAMESPACE_VERSION} // namespace std#endif // C++11#endif // _GLIBCXX_FUNCTIONAL