libstdc++
entry_cmp.hpp
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1 // -*- C++ -*-
2 
3 // Copyright (C) 2005-2015 Free Software Foundation, Inc.
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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 
44 namespace __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 typename _Alloc::template rebind<_VTp> __rebind_v;
66 
67  public:
68  typedef typename __rebind_v::other::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 extensions for policy-based data structures for public use.
Entry compare, primary template.
Definition: entry_cmp.hpp:50