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jeremybenn |
// Output streams -*- C++ -*-
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// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
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// 2006, 2007, 2008, 2009, 2010
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// Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// .
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/** @file ostream
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* This is a Standard C++ Library header.
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*/
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//
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// ISO C++ 14882: 27.6.2 Output streams
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//
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#ifndef _GLIBCXX_OSTREAM
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#define _GLIBCXX_OSTREAM 1
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#pragma GCC system_header
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#include
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#include
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_GLIBCXX_BEGIN_NAMESPACE(std)
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// [27.6.2.1] Template class basic_ostream
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/**
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* @brief Controlling output.
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* @ingroup io
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*
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* This is the base class for all output streams. It provides text
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* formatting of all builtin types, and communicates with any class
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* derived from basic_streambuf to do the actual output.
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*/
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template
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class basic_ostream : virtual public basic_ios<_CharT, _Traits>
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{
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public:
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// Types (inherited from basic_ios (27.4.4)):
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typedef _CharT char_type;
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typedef typename _Traits::int_type int_type;
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typedef typename _Traits::pos_type pos_type;
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typedef typename _Traits::off_type off_type;
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typedef _Traits traits_type;
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// Non-standard Types:
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typedef basic_streambuf<_CharT, _Traits> __streambuf_type;
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typedef basic_ios<_CharT, _Traits> __ios_type;
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typedef basic_ostream<_CharT, _Traits> __ostream_type;
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typedef num_put<_CharT, ostreambuf_iterator<_CharT, _Traits> >
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__num_put_type;
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typedef ctype<_CharT> __ctype_type;
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// [27.6.2.2] constructor/destructor
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/**
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* @brief Base constructor.
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*
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* This ctor is almost never called by the user directly, rather from
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* derived classes' initialization lists, which pass a pointer to
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* their own stream buffer.
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*/
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explicit
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basic_ostream(__streambuf_type* __sb)
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{ this->init(__sb); }
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/**
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* @brief Base destructor.
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*
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* This does very little apart from providing a virtual base dtor.
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*/
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virtual
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~basic_ostream() { }
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// [27.6.2.3] prefix/suffix
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class sentry;
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friend class sentry;
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// [27.6.2.5] formatted output
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// [27.6.2.5.3] basic_ostream::operator<<
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//@{
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/**
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* @brief Interface for manipulators.
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*
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* Manipulators such as @c std::endl and @c std::hex use these
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* functions in constructs like "std::cout << std::endl". For more
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* information, see the iomanip header.
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*/
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__ostream_type&
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operator<<(__ostream_type& (*__pf)(__ostream_type&))
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{
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// DR 60. What is a formatted input function?
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// The inserters for manipulators are *not* formatted output functions.
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return __pf(*this);
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}
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__ostream_type&
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operator<<(__ios_type& (*__pf)(__ios_type&))
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{
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// DR 60. What is a formatted input function?
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// The inserters for manipulators are *not* formatted output functions.
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__pf(*this);
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return *this;
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}
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__ostream_type&
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operator<<(ios_base& (*__pf) (ios_base&))
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{
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// DR 60. What is a formatted input function?
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// The inserters for manipulators are *not* formatted output functions.
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__pf(*this);
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return *this;
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}
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//@}
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// [27.6.2.5.2] arithmetic inserters
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/**
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* @name Arithmetic Inserters
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*
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* All the @c operator<< functions (aka formatted output
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* functions) have some common behavior. Each starts by
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* constructing a temporary object of type std::basic_ostream::sentry.
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* This can have several effects, concluding with the setting of a
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* status flag; see the sentry documentation for more.
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*
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* If the sentry status is good, the function tries to generate
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* whatever data is appropriate for the type of the argument.
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*
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* If an exception is thrown during insertion, ios_base::badbit
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* will be turned on in the stream's error state without causing an
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* ios_base::failure to be thrown. The original exception will then
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* be rethrown.
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*/
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//@{
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/**
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* @brief Basic arithmetic inserters
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* @param A variable of builtin type.
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* @return @c *this if successful
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*
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* These functions use the stream's current locale (specifically, the
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* @c num_get facet) to perform numeric formatting.
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*/
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__ostream_type&
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operator<<(long __n)
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{ return _M_insert(__n); }
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__ostream_type&
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operator<<(unsigned long __n)
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{ return _M_insert(__n); }
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__ostream_type&
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operator<<(bool __n)
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{ return _M_insert(__n); }
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__ostream_type&
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operator<<(short __n);
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__ostream_type&
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operator<<(unsigned short __n)
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{
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 117. basic_ostream uses nonexistent num_put member functions.
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return _M_insert(static_cast(__n));
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}
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__ostream_type&
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operator<<(int __n);
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__ostream_type&
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operator<<(unsigned int __n)
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{
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 117. basic_ostream uses nonexistent num_put member functions.
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return _M_insert(static_cast(__n));
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}
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#ifdef _GLIBCXX_USE_LONG_LONG
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__ostream_type&
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operator<<(long long __n)
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{ return _M_insert(__n); }
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__ostream_type&
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operator<<(unsigned long long __n)
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{ return _M_insert(__n); }
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#endif
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__ostream_type&
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operator<<(double __f)
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{ return _M_insert(__f); }
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__ostream_type&
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operator<<(float __f)
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{
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// 117. basic_ostream uses nonexistent num_put member functions.
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return _M_insert(static_cast(__f));
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}
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__ostream_type&
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operator<<(long double __f)
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{ return _M_insert(__f); }
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__ostream_type&
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operator<<(const void* __p)
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{ return _M_insert(__p); }
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/**
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* @brief Extracting from another streambuf.
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* @param sb A pointer to a streambuf
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*
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* This function behaves like one of the basic arithmetic extractors,
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* in that it also constructs a sentry object and has the same error
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* handling behavior.
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*
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* If @a sb is NULL, the stream will set failbit in its error state.
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*
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* Characters are extracted from @a sb and inserted into @c *this
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* until one of the following occurs:
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*
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* - the input stream reaches end-of-file,
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* - insertion into the output sequence fails (in this case, the
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* character that would have been inserted is not extracted), or
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* - an exception occurs while getting a character from @a sb, which
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* sets failbit in the error state
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*
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* If the function inserts no characters, failbit is set.
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*/
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__ostream_type&
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operator<<(__streambuf_type* __sb);
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//@}
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// [27.6.2.6] unformatted output functions
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/**
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* @name Unformatted Output Functions
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*
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* All the unformatted output functions have some common behavior.
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* Each starts by constructing a temporary object of type
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* std::basic_ostream::sentry. This has several effects, concluding
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* with the setting of a status flag; see the sentry documentation
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* for more.
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*
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* If the sentry status is good, the function tries to generate
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* whatever data is appropriate for the type of the argument.
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*
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* If an exception is thrown during insertion, ios_base::badbit
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* will be turned on in the stream's error state. If badbit is on in
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* the stream's exceptions mask, the exception will be rethrown
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* without completing its actions.
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*/
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//@{
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/**
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* @brief Simple insertion.
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* @param c The character to insert.
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* @return *this
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*
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* Tries to insert @a c.
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*
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* @note This function is not overloaded on signed char and
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* unsigned char.
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*/
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__ostream_type&
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put(char_type __c);
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// Core write functionality, without sentry.
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void
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_M_write(const char_type* __s, streamsize __n)
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{
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const streamsize __put = this->rdbuf()->sputn(__s, __n);
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if (__put != __n)
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this->setstate(ios_base::badbit);
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}
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/**
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* @brief Character string insertion.
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* @param s The array to insert.
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* @param n Maximum number of characters to insert.
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* @return *this
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*
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* Characters are copied from @a s and inserted into the stream until
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* one of the following happens:
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*
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* - @a n characters are inserted
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* - inserting into the output sequence fails (in this case, badbit
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* will be set in the stream's error state)
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*
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* @note This function is not overloaded on signed char and
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* unsigned char.
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*/
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__ostream_type&
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write(const char_type* __s, streamsize __n);
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//@}
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/**
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* @brief Synchronizing the stream buffer.
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* @return *this
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*
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* If @c rdbuf() is a null pointer, changes nothing.
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*
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* Otherwise, calls @c rdbuf()->pubsync(), and if that returns -1,
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* sets badbit.
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*/
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__ostream_type&
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flush();
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// [27.6.2.4] seek members
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/**
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* @brief Getting the current write position.
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* @return A file position object.
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*
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* If @c fail() is not false, returns @c pos_type(-1) to indicate
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* failure. Otherwise returns @c rdbuf()->pubseekoff(0,cur,out).
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*/
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pos_type
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tellp();
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/**
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* @brief Changing the current write position.
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* @param pos A file position object.
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* @return *this
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*
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* If @c fail() is not true, calls @c rdbuf()->pubseekpos(pos). If
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* that function fails, sets failbit.
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*/
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__ostream_type&
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seekp(pos_type);
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/**
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* @brief Changing the current write position.
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* @param off A file offset object.
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* @param dir The direction in which to seek.
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* @return *this
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*
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* If @c fail() is not true, calls @c rdbuf()->pubseekoff(off,dir).
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* If that function fails, sets failbit.
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*/
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__ostream_type&
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seekp(off_type, ios_base::seekdir);
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protected:
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basic_ostream()
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{ this->init(0); }
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|
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template
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__ostream_type&
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_M_insert(_ValueT __v);
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};
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/**
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* @brief Performs setup work for output streams.
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*
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* Objects of this class are created before all of the standard
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|
* inserters are run. It is responsible for exception-safe prefix and
|
374 |
|
|
* suffix operations.
|
375 |
|
|
*/
|
376 |
|
|
template
|
377 |
|
|
class basic_ostream<_CharT, _Traits>::sentry
|
378 |
|
|
{
|
379 |
|
|
// Data Members.
|
380 |
|
|
bool _M_ok;
|
381 |
|
|
basic_ostream<_CharT, _Traits>& _M_os;
|
382 |
|
|
|
383 |
|
|
public:
|
384 |
|
|
/**
|
385 |
|
|
* @brief The constructor performs preparatory work.
|
386 |
|
|
* @param os The output stream to guard.
|
387 |
|
|
*
|
388 |
|
|
* If the stream state is good (@a os.good() is true), then if the
|
389 |
|
|
* stream is tied to another output stream, @c is.tie()->flush()
|
390 |
|
|
* is called to synchronize the output sequences.
|
391 |
|
|
*
|
392 |
|
|
* If the stream state is still good, then the sentry state becomes
|
393 |
|
|
* true (@a okay).
|
394 |
|
|
*/
|
395 |
|
|
explicit
|
396 |
|
|
sentry(basic_ostream<_CharT, _Traits>& __os);
|
397 |
|
|
|
398 |
|
|
/**
|
399 |
|
|
* @brief Possibly flushes the stream.
|
400 |
|
|
*
|
401 |
|
|
* If @c ios_base::unitbuf is set in @c os.flags(), and
|
402 |
|
|
* @c std::uncaught_exception() is true, the sentry destructor calls
|
403 |
|
|
* @c flush() on the output stream.
|
404 |
|
|
*/
|
405 |
|
|
~sentry()
|
406 |
|
|
{
|
407 |
|
|
// XXX MT
|
408 |
|
|
if (bool(_M_os.flags() & ios_base::unitbuf) && !uncaught_exception())
|
409 |
|
|
{
|
410 |
|
|
// Can't call flush directly or else will get into recursive lock.
|
411 |
|
|
if (_M_os.rdbuf() && _M_os.rdbuf()->pubsync() == -1)
|
412 |
|
|
_M_os.setstate(ios_base::badbit);
|
413 |
|
|
}
|
414 |
|
|
}
|
415 |
|
|
|
416 |
|
|
/**
|
417 |
|
|
* @brief Quick status checking.
|
418 |
|
|
* @return The sentry state.
|
419 |
|
|
*
|
420 |
|
|
* For ease of use, sentries may be converted to booleans. The
|
421 |
|
|
* return value is that of the sentry state (true == okay).
|
422 |
|
|
*/
|
423 |
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
424 |
|
|
explicit
|
425 |
|
|
#endif
|
426 |
|
|
operator bool() const
|
427 |
|
|
{ return _M_ok; }
|
428 |
|
|
};
|
429 |
|
|
|
430 |
|
|
// [27.6.2.5.4] character insertion templates
|
431 |
|
|
//@{
|
432 |
|
|
/**
|
433 |
|
|
* @brief Character inserters
|
434 |
|
|
* @param out An output stream.
|
435 |
|
|
* @param c A character.
|
436 |
|
|
* @return out
|
437 |
|
|
*
|
438 |
|
|
* Behaves like one of the formatted arithmetic inserters described in
|
439 |
|
|
* std::basic_ostream. After constructing a sentry object with good
|
440 |
|
|
* status, this function inserts a single character and any required
|
441 |
|
|
* padding (as determined by [22.2.2.2.2]). @c out.width(0) is then
|
442 |
|
|
* called.
|
443 |
|
|
*
|
444 |
|
|
* If @a c is of type @c char and the character type of the stream is not
|
445 |
|
|
* @c char, the character is widened before insertion.
|
446 |
|
|
*/
|
447 |
|
|
template
|
448 |
|
|
inline basic_ostream<_CharT, _Traits>&
|
449 |
|
|
operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
|
450 |
|
|
{ return __ostream_insert(__out, &__c, 1); }
|
451 |
|
|
|
452 |
|
|
template
|
453 |
|
|
inline basic_ostream<_CharT, _Traits>&
|
454 |
|
|
operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
|
455 |
|
|
{ return (__out << __out.widen(__c)); }
|
456 |
|
|
|
457 |
|
|
// Specialization
|
458 |
|
|
template
|
459 |
|
|
inline basic_ostream&
|
460 |
|
|
operator<<(basic_ostream& __out, char __c)
|
461 |
|
|
{ return __ostream_insert(__out, &__c, 1); }
|
462 |
|
|
|
463 |
|
|
// Signed and unsigned
|
464 |
|
|
template
|
465 |
|
|
inline basic_ostream&
|
466 |
|
|
operator<<(basic_ostream& __out, signed char __c)
|
467 |
|
|
{ return (__out << static_cast(__c)); }
|
468 |
|
|
|
469 |
|
|
template
|
470 |
|
|
inline basic_ostream&
|
471 |
|
|
operator<<(basic_ostream& __out, unsigned char __c)
|
472 |
|
|
{ return (__out << static_cast(__c)); }
|
473 |
|
|
//@}
|
474 |
|
|
|
475 |
|
|
//@{
|
476 |
|
|
/**
|
477 |
|
|
* @brief String inserters
|
478 |
|
|
* @param out An output stream.
|
479 |
|
|
* @param s A character string.
|
480 |
|
|
* @return out
|
481 |
|
|
* @pre @a s must be a non-NULL pointer
|
482 |
|
|
*
|
483 |
|
|
* Behaves like one of the formatted arithmetic inserters described in
|
484 |
|
|
* std::basic_ostream. After constructing a sentry object with good
|
485 |
|
|
* status, this function inserts @c traits::length(s) characters starting
|
486 |
|
|
* at @a s, widened if necessary, followed by any required padding (as
|
487 |
|
|
* determined by [22.2.2.2.2]). @c out.width(0) is then called.
|
488 |
|
|
*/
|
489 |
|
|
template
|
490 |
|
|
inline basic_ostream<_CharT, _Traits>&
|
491 |
|
|
operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
|
492 |
|
|
{
|
493 |
|
|
if (!__s)
|
494 |
|
|
__out.setstate(ios_base::badbit);
|
495 |
|
|
else
|
496 |
|
|
__ostream_insert(__out, __s,
|
497 |
|
|
static_cast(_Traits::length(__s)));
|
498 |
|
|
return __out;
|
499 |
|
|
}
|
500 |
|
|
|
501 |
|
|
template
|
502 |
|
|
basic_ostream<_CharT, _Traits> &
|
503 |
|
|
operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s);
|
504 |
|
|
|
505 |
|
|
// Partial specializations
|
506 |
|
|
template
|
507 |
|
|
inline basic_ostream&
|
508 |
|
|
operator<<(basic_ostream& __out, const char* __s)
|
509 |
|
|
{
|
510 |
|
|
if (!__s)
|
511 |
|
|
__out.setstate(ios_base::badbit);
|
512 |
|
|
else
|
513 |
|
|
__ostream_insert(__out, __s,
|
514 |
|
|
static_cast(_Traits::length(__s)));
|
515 |
|
|
return __out;
|
516 |
|
|
}
|
517 |
|
|
|
518 |
|
|
// Signed and unsigned
|
519 |
|
|
template
|
520 |
|
|
inline basic_ostream&
|
521 |
|
|
operator<<(basic_ostream& __out, const signed char* __s)
|
522 |
|
|
{ return (__out << reinterpret_cast(__s)); }
|
523 |
|
|
|
524 |
|
|
template
|
525 |
|
|
inline basic_ostream &
|
526 |
|
|
operator<<(basic_ostream& __out, const unsigned char* __s)
|
527 |
|
|
{ return (__out << reinterpret_cast(__s)); }
|
528 |
|
|
//@}
|
529 |
|
|
|
530 |
|
|
// [27.6.2.7] standard basic_ostream manipulators
|
531 |
|
|
/**
|
532 |
|
|
* @brief Write a newline and flush the stream.
|
533 |
|
|
*
|
534 |
|
|
* This manipulator is often mistakenly used when a simple newline is
|
535 |
|
|
* desired, leading to poor buffering performance. See
|
536 |
|
|
* http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt11ch25s02.html
|
537 |
|
|
* for more on this subject.
|
538 |
|
|
*/
|
539 |
|
|
template
|
540 |
|
|
inline basic_ostream<_CharT, _Traits>&
|
541 |
|
|
endl(basic_ostream<_CharT, _Traits>& __os)
|
542 |
|
|
{ return flush(__os.put(__os.widen('\n'))); }
|
543 |
|
|
|
544 |
|
|
/**
|
545 |
|
|
* @brief Write a null character into the output sequence.
|
546 |
|
|
*
|
547 |
|
|
* Null character is @c CharT() by definition. For CharT of @c char,
|
548 |
|
|
* this correctly writes the ASCII @c NUL character string terminator.
|
549 |
|
|
*/
|
550 |
|
|
template
|
551 |
|
|
inline basic_ostream<_CharT, _Traits>&
|
552 |
|
|
ends(basic_ostream<_CharT, _Traits>& __os)
|
553 |
|
|
{ return __os.put(_CharT()); }
|
554 |
|
|
|
555 |
|
|
/**
|
556 |
|
|
* @brief Flushes the output stream.
|
557 |
|
|
*
|
558 |
|
|
* This manipulator simply calls the stream's @c flush() member function.
|
559 |
|
|
*/
|
560 |
|
|
template
|
561 |
|
|
inline basic_ostream<_CharT, _Traits>&
|
562 |
|
|
flush(basic_ostream<_CharT, _Traits>& __os)
|
563 |
|
|
{ return __os.flush(); }
|
564 |
|
|
|
565 |
|
|
#ifdef __GXX_EXPERIMENTAL_CXX0X__
|
566 |
|
|
// [27.7.2.9] Rvalue stream insertion
|
567 |
|
|
/**
|
568 |
|
|
* @brief Generic inserter for rvalue stream
|
569 |
|
|
* @param os An input stream.
|
570 |
|
|
* @param x A reference to the object being inserted.
|
571 |
|
|
* @return os
|
572 |
|
|
*
|
573 |
|
|
* This is just a forwarding function to allow insertion to
|
574 |
|
|
* rvalue streams since they won't bind to the inserter functions
|
575 |
|
|
* that take an lvalue reference.
|
576 |
|
|
*/
|
577 |
|
|
template
|
578 |
|
|
inline basic_ostream<_CharT, _Traits>&
|
579 |
|
|
operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
|
580 |
|
|
{ return (__os << __x); }
|
581 |
|
|
#endif // __GXX_EXPERIMENTAL_CXX0X__
|
582 |
|
|
|
583 |
|
|
_GLIBCXX_END_NAMESPACE
|
584 |
|
|
|
585 |
|
|
#ifndef _GLIBCXX_EXPORT_TEMPLATE
|
586 |
|
|
# include
|
587 |
|
|
#endif
|
588 |
|
|
|
589 |
|
|
#endif /* _GLIBCXX_OSTREAM */
|