libstdc++: entry_cmp.hpp Source File

libstdc++

entry_cmp.hpp
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1// -*- C++ -*-
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3// Copyright (C) 2005-2026 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
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7// of the GNU General Public License as published by the Free Software
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18// 3.1, as published by the Free Software Foundation.
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25// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
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35
36/**
37 * @file binary_heap_/entry_cmp.hpp
38 * Contains an implementation class for a binary_heap.
39 */
40
41#ifndef PB_DS_BINARY_HEAP_ENTRY_CMP_HPP
42#define PB_DS_BINARY_HEAP_ENTRY_CMP_HPP
43
44namespace __gnu_pbds
45{
46 namespace detail
47 {
48 /// Entry compare, primary template.
49 template<typename _VTp, typename Cmp_Fn, typename _Alloc, bool No_Throw>
50 struct entry_cmp;
51
52 /// Specialization, true.
53 template<typename _VTp, typename Cmp_Fn, typename _Alloc>
54 struct entry_cmp<_VTp, Cmp_Fn, _Alloc, true>
55 {
56 /// Compare.
57 typedef Cmp_Fn type;
58 };
59
60 /// Specialization, false.
61 template<typename _VTp, typename Cmp_Fn, typename _Alloc>
62 struct entry_cmp<_VTp, Cmp_Fn, _Alloc, false>
63 {
64 private:
65 typedef rebind_traits<_Alloc, _VTp> __rebind_v;
66
67 public:
68 typedef typename __rebind_v::const_pointer entry;
69
70 /// Compare plus entry.
71 struct type : public Cmp_Fn
72 {
73 type() { }
74
75 type(const Cmp_Fn& other) : Cmp_Fn(other) { }
76
77 bool
78 operator()(entry lhs, entry rhs) const
79 { return Cmp_Fn::operator()(*lhs, *rhs); }
80 };
81 };
82 } // namespace detail
83} // namespace __gnu_pbds
84
85#endif // #ifndef PB_DS_BINARY_HEAP_ENTRY_CMP_HPP
__gnu_pbds
GNU extensions for policy-based data structures for public use.
Definition assoc_container.hpp:52
__gnu_pbds::detail::rebind_traits
Consistent API for accessing allocator-related types.
Definition types_traits.hpp:140
__gnu_pbds::detail::entry_cmp
Entry compare, primary template.
Definition entry_cmp.hpp:50
__gnu_pbds::detail::entry_cmp< _VTp, Cmp_Fn, _Alloc, true >::type
Cmp_Fn type
Compare.
Definition entry_cmp.hpp:57