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Editing: optional_relops.hpp
// Copyright (C) 2003, 2008 Fernando Luis Cacciola Carballal. // Copyright (C) 2015 Andrzej Krzemienski. // // Use, modification, and distribution is subject to the Boost Software // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) // // See http://www.boost.org/libs/optional for documentation. // // You are welcome to contact the author at: // akrzemi1@gmail.com #ifndef BOOST_OPTIONAL_DETAIL_OPTIONAL_RELOPS_AJK_03OCT2015_HPP #define BOOST_OPTIONAL_DETAIL_OPTIONAL_RELOPS_AJK_03OCT2015_HPP namespace boost { // optional's relational operators ( ==, !=, <, >, <=, >= ) have deep-semantics (compare values). // WARNING: This is UNLIKE pointers. Use equal_pointees()/less_pointess() in generic code instead. // // optional<T> vs optional<T> cases // template<class T> inline bool operator == ( optional<T> const& x, optional<T> const& y ) { return bool(x) && bool(y) ? *x == *y : bool(x) == bool(y); } template<class T> inline bool operator < ( optional<T> const& x, optional<T> const& y ) { return less_pointees(x,y); } template<class T> inline bool operator != ( optional<T> const& x, optional<T> const& y ) { return !( x == y ) ; } template<class T> inline bool operator > ( optional<T> const& x, optional<T> const& y ) { return y < x ; } template<class T> inline bool operator <= ( optional<T> const& x, optional<T> const& y ) { return !( y < x ) ; } template<class T> inline bool operator >= ( optional<T> const& x, optional<T> const& y ) { return !( x < y ) ; } // // optional<T> vs T cases // template<class T> inline bool operator == ( optional<T> const& x, T const& y ) { return equal_pointees(x, optional<T>(y)); } template<class T> inline bool operator < ( optional<T> const& x, T const& y ) { return less_pointees(x, optional<T>(y)); } template<class T> inline bool operator != ( optional<T> const& x, T const& y ) { return !( x == y ) ; } template<class T> inline bool operator > ( optional<T> const& x, T const& y ) { return y < x ; } template<class T> inline bool operator <= ( optional<T> const& x, T const& y ) { return !( y < x ) ; } template<class T> inline bool operator >= ( optional<T> const& x, T const& y ) { return !( x < y ) ; } // // T vs optional<T> cases // template<class T> inline bool operator == ( T const& x, optional<T> const& y ) { return equal_pointees( optional<T>(x), y ); } template<class T> inline bool operator < ( T const& x, optional<T> const& y ) { return less_pointees( optional<T>(x), y ); } template<class T> inline bool operator != ( T const& x, optional<T> const& y ) { return !( x == y ) ; } template<class T> inline bool operator > ( T const& x, optional<T> const& y ) { return y < x ; } template<class T> inline bool operator <= ( T const& x, optional<T> const& y ) { return !( y < x ) ; } template<class T> inline bool operator >= ( T const& x, optional<T> const& y ) { return !( x < y ) ; } // // optional<T> vs none cases // template<class T> inline bool operator == ( optional<T> const& x, none_t ) BOOST_NOEXCEPT { return !x; } template<class T> inline bool operator < ( optional<T> const& x, none_t ) { return less_pointees(x,optional<T>() ); } template<class T> inline bool operator != ( optional<T> const& x, none_t ) BOOST_NOEXCEPT { return bool(x); } template<class T> inline bool operator > ( optional<T> const& x, none_t y ) { return y < x ; } template<class T> inline bool operator <= ( optional<T> const& x, none_t y ) { return !( y < x ) ; } template<class T> inline bool operator >= ( optional<T> const& x, none_t y ) { return !( x < y ) ; } // // none vs optional<T> cases // template<class T> inline bool operator == ( none_t , optional<T> const& y ) BOOST_NOEXCEPT { return !y; } template<class T> inline bool operator < ( none_t , optional<T> const& y ) { return less_pointees(optional<T>() ,y); } template<class T> inline bool operator != ( none_t, optional<T> const& y ) BOOST_NOEXCEPT { return bool(y); } template<class T> inline bool operator > ( none_t x, optional<T> const& y ) { return y < x ; } template<class T> inline bool operator <= ( none_t x, optional<T> const& y ) { return !( y < x ) ; } template<class T> inline bool operator >= ( none_t x, optional<T> const& y ) { return !( x < y ) ; } } // namespace boost #endif // header guard
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