0,0 → 1,110 |
// -*- C++ -*- |
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// Copyright (C) 2005-2015 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. |
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// 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. |
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// 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. |
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// 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/>. |
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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 |
// 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. |
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/** |
* @file hash_eq_fn.hpp |
* Contains 2 eqivalence functions, one employing a hash value, |
* and one ignoring it. |
*/ |
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#ifndef PB_DS_HASH_EQ_FN_HPP |
#define PB_DS_HASH_EQ_FN_HPP |
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#include <utility> |
#include <debug/debug.h> |
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namespace __gnu_pbds |
{ |
namespace detail |
{ |
/// Primary template. |
template<typename Key, typename Eq_Fn, typename _Alloc, bool Store_Hash> |
struct hash_eq_fn; |
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/// 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; |
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hash_eq_fn() { } |
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hash_eq_fn(const Eq_Fn& r_eq_fn) : Eq_Fn(r_eq_fn) { } |
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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); } |
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void |
swap(const hash_eq_fn& other) |
{ std::swap((Eq_Fn&)(*this), (Eq_Fn&)other); } |
}; |
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/// 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; |
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hash_eq_fn() { } |
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hash_eq_fn(const Eq_Fn& r_eq_fn) : Eq_Fn(r_eq_fn) { } |
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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); |
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return (lhs_hash == rhs_hash && |
eq_fn_base::operator()(r_lhs_key, r_rhs_key)); |
} |
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void |
swap(const hash_eq_fn& other) |
{ std::swap((Eq_Fn&)(*this), (Eq_Fn&)(other)); } |
}; |
} // namespace detail |
} // namespace __gnu_pbds |
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#endif |