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ultra_embe |
// -*- C++ -*-
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// Copyright (C) 2005, 2006, 2009 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 terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// 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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// <http://www.gnu.org/licenses/>.
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// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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// Permission to use, copy, modify, sell, and distribute this software
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// is hereby granted without fee, provided that the above copyright
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// notice appears in all copies, and that both that copyright notice
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// and this permission notice appear in supporting documentation. None
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// of the above authors, nor IBM Haifa Research Laboratories, make any
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// representation about the suitability of this software for any
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// purpose. It is provided "as is" without express or implied
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// warranty.
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/**
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* @file pat_trie_/synth_access_traits.hpp
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* Contains an implementation class for a patricia tree.
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*/
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#ifndef PB_DS_SYNTH_E_ACCESS_TRAITS_HPP
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#define PB_DS_SYNTH_E_ACCESS_TRAITS_HPP
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#include <ext/pb_ds/detail/type_utils.hpp>
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namespace __gnu_pbds
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{
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namespace detail
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{
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#define PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC \
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template<typename Type_Traits, bool Set, typename _ATraits>
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#define PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC \
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synth_access_traits<Type_Traits, Set, _ATraits>
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/// Synthetic element access traits.
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template<typename Type_Traits, bool Set, typename _ATraits>
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struct synth_access_traits : public _ATraits
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{
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typedef _ATraits base_type;
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typedef typename base_type::const_iterator const_iterator;
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typedef Type_Traits type_traits;
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typedef typename type_traits::const_reference const_reference;
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typedef typename type_traits::key_const_reference key_const_reference;
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synth_access_traits();
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synth_access_traits(const base_type&);
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inline bool
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equal_prefixes(const_iterator, const_iterator, const_iterator,
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const_iterator, bool compare_after = true) const;
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bool
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equal_keys(key_const_reference, key_const_reference) const;
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bool
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cmp_prefixes(const_iterator, const_iterator, const_iterator,
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const_iterator, bool compare_after = false) const;
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bool
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cmp_keys(key_const_reference, key_const_reference) const;
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inline static key_const_reference
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extract_key(const_reference);
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#ifdef _GLIBCXX_DEBUG
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bool
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operator()(key_const_reference, key_const_reference);
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#endif
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private:
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inline static key_const_reference
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extract_key(const_reference, true_type);
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inline static key_const_reference
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extract_key(const_reference, false_type);
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static integral_constant<int, Set> s_set_ind;
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};
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PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
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integral_constant<int,Set>
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PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::s_set_ind;
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PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
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PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
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synth_access_traits()
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{ }
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PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
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PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
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synth_access_traits(const _ATraits& r_traits)
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: _ATraits(r_traits)
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{ }
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PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
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inline bool
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PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
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equal_prefixes(const_iterator b_l, const_iterator e_l, const_iterator b_r,
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const_iterator e_r, bool compare_after /*= false */) const
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{
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while (b_l != e_l)
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{
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if (b_r == e_r)
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return false;
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if (base_type::e_pos(*b_l) != base_type::e_pos(*b_r))
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return false;
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++b_l;
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++b_r;
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}
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return (!compare_after || b_r == e_r);
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}
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PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
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bool
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PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
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equal_keys(key_const_reference r_lhs_key,
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key_const_reference r_rhs_key) const
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{
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return equal_prefixes(base_type::begin(r_lhs_key),
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base_type::end(r_lhs_key),
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base_type::begin(r_rhs_key),
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base_type::end(r_rhs_key),
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true);
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}
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PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
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bool
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PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
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cmp_prefixes(const_iterator b_l, const_iterator e_l, const_iterator b_r,
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const_iterator e_r, bool compare_after /* = false*/) const
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{
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while (b_l != e_l)
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{
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if (b_r == e_r)
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return false;
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const typename base_type::size_type l_pos = base_type::e_pos(*b_l);
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const typename base_type::size_type r_pos = base_type::e_pos(*b_r);
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if (l_pos != r_pos)
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return l_pos < r_pos;
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++b_l;
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++b_r;
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}
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if (!compare_after)
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return false;
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return b_r != e_r;
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}
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PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
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bool
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PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
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cmp_keys(key_const_reference r_lhs_key,
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key_const_reference r_rhs_key) const
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{
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return cmp_prefixes(base_type::begin(r_lhs_key),
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base_type::end(r_lhs_key),
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base_type::begin(r_rhs_key),
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base_type::end(r_rhs_key),
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true);
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}
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PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
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inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::key_const_reference
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PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
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extract_key(const_reference r_val)
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{ return extract_key(r_val, s_set_ind); }
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PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
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inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::key_const_reference
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PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
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extract_key(const_reference r_val, true_type)
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{ return r_val; }
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PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
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inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::key_const_reference
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PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
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extract_key(const_reference r_val, false_type)
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{ return r_val.first; }
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#ifdef _GLIBCXX_DEBUG
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PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
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bool
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PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
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operator()(key_const_reference r_lhs, key_const_reference r_rhs)
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{ return cmp_keys(r_lhs, r_rhs); }
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#endif
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#undef PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
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#undef PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC
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} // namespace detail
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} // namespace __gnu_pbds
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#endif
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