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1 | // 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 | // | |
12 | #ifndef BOOST_UTILITY_COMPARE_POINTEES_25AGO2003_HPP | |
13 | #define BOOST_UTILITY_COMPARE_POINTEES_25AGO2003_HPP | |
14 | ||
15 | #include<functional> | |
16 | ||
17 | namespace boost { | |
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 | |
28 | template<class OptionalPointee> | |
29 | inline | |
30 | bool equal_pointees ( OptionalPointee const& x, OptionalPointee const& y ) | |
31 | { | |
32 | return (!x) != (!y) ? false : ( !x ? true : (*x) == (*y) ) ; | |
33 | } | |
34 | ||
35 | template<class OptionalPointee> | |
36 | struct 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 | |
51 | template<class OptionalPointee> | |
52 | inline | |
53 | bool less_pointees ( OptionalPointee const& x, OptionalPointee const& y ) | |
54 | { | |
55 | return !y ? false : ( !x ? true : (*x) < (*y) ) ; | |
56 | } | |
57 | ||
58 | template<class OptionalPointee> | |
59 | struct 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 boost | |
66 | ||
67 | #endif | |
68 |