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Diffstat (limited to '8/sources/cxx-stl/gnu-libstdc++/4.7/include/ext/pb_ds/detail/eq_fn/hash_eq_fn.hpp')
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1 files changed, 110 insertions, 0 deletions
diff --git a/8/sources/cxx-stl/gnu-libstdc++/4.7/include/ext/pb_ds/detail/eq_fn/hash_eq_fn.hpp b/8/sources/cxx-stl/gnu-libstdc++/4.7/include/ext/pb_ds/detail/eq_fn/hash_eq_fn.hpp new file mode 100644 index 0000000..52844f6 --- /dev/null +++ b/8/sources/cxx-stl/gnu-libstdc++/4.7/include/ext/pb_ds/detail/eq_fn/hash_eq_fn.hpp @@ -0,0 +1,110 @@ +// -*- C++ -*- + +// Copyright (C) 2005, 2006, 2009, 2011 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) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL. + +// Permission to use, copy, modify, sell, and distribute this software +// is hereby granted without fee, provided that the above copyright +// notice appears in all copies, and that both that copyright notice +// and this permission notice appear in supporting documentation. None +// of the above authors, nor IBM Haifa Research Laboratories, make any +// representation about the suitability of this software for any +// purpose. It is provided "as is" without express or implied +// warranty. + +/** + * @file hash_eq_fn.hpp + * Contains 2 eqivalence functions, one employing a hash value, + * and one ignoring it. + */ + +#ifndef PB_DS_HASH_EQ_FN_HPP +#define PB_DS_HASH_EQ_FN_HPP + +#include <utility> +#include <debug/debug.h> + +namespace __gnu_pbds +{ + namespace detail + { + /// Primary template. + template<typename Key, typename Eq_Fn, typename _Alloc, bool Store_Hash> + struct hash_eq_fn; + + /// Specialization 1 - The client requests that hash values not be stored. + template<typename Key, typename Eq_Fn, typename _Alloc> + struct hash_eq_fn<Key, Eq_Fn, _Alloc, false> : public Eq_Fn + { + typedef Eq_Fn eq_fn_base; + typedef typename _Alloc::template rebind<Key>::other key_allocator; + typedef typename key_allocator::const_reference key_const_reference; + + hash_eq_fn() { } + + hash_eq_fn(const Eq_Fn& r_eq_fn) : Eq_Fn(r_eq_fn) { } + + bool + operator()(key_const_reference r_lhs_key, + key_const_reference r_rhs_key) const + { return eq_fn_base::operator()(r_lhs_key, r_rhs_key); } + + void + swap(const hash_eq_fn& other) + { std::swap((Eq_Fn&)(*this), (Eq_Fn&)other); } + }; + + + /// Specialization 2 - The client requests that hash values be stored. + template<typename Key, class Eq_Fn, class _Alloc> + struct hash_eq_fn<Key, Eq_Fn, _Alloc, true> : public Eq_Fn + { + typedef typename _Alloc::size_type size_type; + typedef Eq_Fn eq_fn_base; + typedef typename _Alloc::template rebind<Key>::other key_allocator; + typedef typename key_allocator::const_reference key_const_reference; + + hash_eq_fn() { } + + hash_eq_fn(const Eq_Fn& r_eq_fn) : Eq_Fn(r_eq_fn) { } + + bool + operator()(key_const_reference r_lhs_key, size_type lhs_hash, + key_const_reference r_rhs_key, size_type rhs_hash) const + { + _GLIBCXX_DEBUG_ASSERT(!eq_fn_base::operator()(r_lhs_key, r_rhs_key) + || lhs_hash == rhs_hash); + + return (lhs_hash == rhs_hash && + eq_fn_base::operator()(r_lhs_key, r_rhs_key)); + } + + void + swap(const hash_eq_fn& other) + { std::swap((Eq_Fn&)(*this), (Eq_Fn&)(other)); } + }; + } // namespace detail +} // namespace __gnu_pbds + +#endif |