blob: 11f1ddd7b6368623444c50dce9ad94fe6495dad4 [file] [log] [blame]
Jeff Thompsonef2d5a42013-08-22 19:09:24 -07001// Copyright (C) 2003, Fernando Luis Cacciola Carballal.
2//
3// Use, modification, and distribution is subject to the Boost Software
4// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
5// http://www.boost.org/LICENSE_1_0.txt)
6//
7// See http://www.boost.org/libs/optional for documentation.
8//
9// You are welcome to contact the author at:
10// fernando_cacciola@hotmail.com
11//
Jeff Thompson3d613fd2013-10-15 15:39:04 -070012#ifndef NDNBOOST_UTILITY_COMPARE_POINTEES_25AGO2003_HPP
13#define NDNBOOST_UTILITY_COMPARE_POINTEES_25AGO2003_HPP
Jeff Thompsonef2d5a42013-08-22 19:09:24 -070014
15#include<functional>
16
17namespace ndnboost {
18
19// template<class OP> bool equal_pointees(OP const& x, OP const& y);
20// template<class OP> struct equal_pointees_t;
21//
22// Being OP a model of OptionalPointee (either a pointer or an optional):
23//
24// If both x and y have valid pointees, returns the result of (*x == *y)
25// If only one has a valid pointee, returns false.
26// If none have valid pointees, returns true.
27// No-throw
28template<class OptionalPointee>
29inline
30bool equal_pointees ( OptionalPointee const& x, OptionalPointee const& y )
31{
32 return (!x) != (!y) ? false : ( !x ? true : (*x) == (*y) ) ;
33}
34
35template<class OptionalPointee>
36struct equal_pointees_t : std::binary_function<OptionalPointee,OptionalPointee,bool>
37{
38 bool operator() ( OptionalPointee const& x, OptionalPointee const& y ) const
39 { return equal_pointees(x,y) ; }
40} ;
41
42// template<class OP> bool less_pointees(OP const& x, OP const& y);
43// template<class OP> struct less_pointees_t;
44//
45// Being OP a model of OptionalPointee (either a pointer or an optional):
46//
47// If y has not a valid pointee, returns false.
48// ElseIf x has not a valid pointee, returns true.
49// ElseIf both x and y have valid pointees, returns the result of (*x < *y)
50// No-throw
51template<class OptionalPointee>
52inline
53bool less_pointees ( OptionalPointee const& x, OptionalPointee const& y )
54{
55 return !y ? false : ( !x ? true : (*x) < (*y) ) ;
56}
57
58template<class OptionalPointee>
59struct less_pointees_t : std::binary_function<OptionalPointee,OptionalPointee,bool>
60{
61 bool operator() ( OptionalPointee const& x, OptionalPointee const& y ) const
62 { return less_pointees(x,y) ; }
63} ;
64
65} // namespace ndnboost
66
67#endif
68