libstdc++
entry_pred.hpp
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1 // -*- C++ -*-
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3 // Copyright (C) 2005, 2006, 2009, 2011 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_pred.hpp
38  * Contains an implementation class for a binary_heap.
39  */
40 
41 #ifndef PB_DS_BINARY_HEAP_ENTRY_PRED_HPP
42 #define PB_DS_BINARY_HEAP_ENTRY_PRED_HPP
43 
44 namespace __gnu_pbds
45 {
46  namespace detail
47  {
48  /// Entry predicate primary class template.
49  template<typename _VTp, typename Pred, typename _Alloc, bool No_Throw>
50  struct entry_pred;
51 
52  /// Specialization, true.
53  template<typename _VTp, typename Pred, typename _Alloc>
54  struct entry_pred<_VTp, Pred, _Alloc, true>
55  {
56  typedef Pred type;
57  };
58 
59  /// Specialization, false.
60  template<typename _VTp, typename Pred, typename _Alloc>
61  struct entry_pred<_VTp, Pred, _Alloc, false>
62  {
63  private:
64  typedef typename _Alloc::template rebind<_VTp> __rebind_v;
65 
66  public:
67  typedef typename __rebind_v::other::const_pointer entry;
68 
69  struct type : public Pred
70  {
71  inline
72  type() { }
73 
74  inline
75  type(const Pred& other) : Pred(other) { }
76 
77  inline bool
78  operator()(entry p_v) const
79  { return Pred::operator()(*p_v); }
80  };
81  };
82  } // namespace detail
83 } // namespace __gnu_pbds
84 
85 #endif // #ifndef PB_DS_BINARY_HEAP_ENTRY_PRED_HPP