1 // Copyright (C) 2003, 2008 Fernando Luis Cacciola Carballal.
2 // Copyright (C) 2015 Andrzej Krzemienski.
4 // Use, modification, and distribution is subject to the Boost Software
5 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
6 // http://www.boost.org/LICENSE_1_0.txt)
8 // See http://www.boost.org/libs/optional for documentation.
10 // You are welcome to contact the author at:
13 #ifndef BOOST_OPTIONAL_DETAIL_OPTIONAL_RELOPS_AJK_03OCT2015_HPP
14 #define BOOST_OPTIONAL_DETAIL_OPTIONAL_RELOPS_AJK_03OCT2015_HPP
18 // optional's relational operators ( ==, !=, <, >, <=, >= ) have deep-semantics (compare values).
19 // WARNING: This is UNLIKE pointers. Use equal_pointees()/less_pointess() in generic code instead.
23 // optional<T> vs optional<T> cases
28 bool operator == ( optional<T> const& x, optional<T> const& y )
29 { return bool(x) && bool(y) ? *x == *y : bool(x) == bool(y); }
33 bool operator < ( optional<T> const& x, optional<T> const& y )
34 { return less_pointees(x,y); }
38 bool operator != ( optional<T> const& x, optional<T> const& y )
39 { return !( x == y ) ; }
43 bool operator > ( optional<T> const& x, optional<T> const& y )
48 bool operator <= ( optional<T> const& x, optional<T> const& y )
49 { return !( y < x ) ; }
53 bool operator >= ( optional<T> const& x, optional<T> const& y )
54 { return !( x < y ) ; }
58 // optional<T> vs T cases
62 bool operator == ( optional<T> const& x, T const& y )
63 { return equal_pointees(x, optional<T>(y)); }
67 bool operator < ( optional<T> const& x, T const& y )
68 { return less_pointees(x, optional<T>(y)); }
72 bool operator != ( optional<T> const& x, T const& y )
73 { return !( x == y ) ; }
77 bool operator > ( optional<T> const& x, T const& y )
82 bool operator <= ( optional<T> const& x, T const& y )
83 { return !( y < x ) ; }
87 bool operator >= ( optional<T> const& x, T const& y )
88 { return !( x < y ) ; }
91 // T vs optional<T> cases
96 bool operator == ( T const& x, optional<T> const& y )
97 { return equal_pointees( optional<T>(x), y ); }
101 bool operator < ( T const& x, optional<T> const& y )
102 { return less_pointees( optional<T>(x), y ); }
106 bool operator != ( T const& x, optional<T> const& y )
107 { return !( x == y ) ; }
111 bool operator > ( T const& x, optional<T> const& y )
116 bool operator <= ( T const& x, optional<T> const& y )
117 { return !( y < x ) ; }
121 bool operator >= ( T const& x, optional<T> const& y )
122 { return !( x < y ) ; }
126 // optional<T> vs none cases
131 bool operator == ( optional<T> const& x, none_t ) BOOST_NOEXCEPT
136 bool operator < ( optional<T> const& x, none_t )
137 { return less_pointees(x,optional<T>() ); }
141 bool operator != ( optional<T> const& x, none_t ) BOOST_NOEXCEPT
146 bool operator > ( optional<T> const& x, none_t y )
151 bool operator <= ( optional<T> const& x, none_t y )
152 { return !( y < x ) ; }
156 bool operator >= ( optional<T> const& x, none_t y )
157 { return !( x < y ) ; }
160 // none vs optional<T> cases
165 bool operator == ( none_t , optional<T> const& y ) BOOST_NOEXCEPT
170 bool operator < ( none_t , optional<T> const& y )
171 { return less_pointees(optional<T>() ,y); }
175 bool operator != ( none_t, optional<T> const& y ) BOOST_NOEXCEPT
180 bool operator > ( none_t x, optional<T> const& y )
185 bool operator <= ( none_t x, optional<T> const& y )
186 { return !( y < x ) ; }
190 bool operator >= ( none_t x, optional<T> const& y )
191 { return !( x < y ) ; }
195 #endif // header guard