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68 lines
2.1 KiB
68 lines
2.1 KiB
// Copyright (C) 2003, Fernando Luis Cacciola Carballal. |
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// |
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// Use, modification, and distribution is subject to the Boost Software |
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// |
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// See http://www.boost.org/libs/optional for documentation. |
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// |
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// You are welcome to contact the author at: |
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// fernando_cacciola@hotmail.com |
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// |
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#ifndef BOOST_UTILITY_COMPARE_POINTEES_25AGO2003_HPP |
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#define BOOST_UTILITY_COMPARE_POINTEES_25AGO2003_HPP |
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#include<functional> |
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namespace boost { |
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// template<class OP> bool equal_pointees(OP const& x, OP const& y); |
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// template<class OP> struct equal_pointees_t; |
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// |
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// Being OP a model of OptionalPointee (either a pointer or an optional): |
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// |
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// If both x and y have valid pointees, returns the result of (*x == *y) |
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// If only one has a valid pointee, returns false. |
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// If none have valid pointees, returns true. |
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// No-throw |
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template<class OptionalPointee> |
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inline |
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bool equal_pointees ( OptionalPointee const& x, OptionalPointee const& y ) |
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{ |
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return (!x) != (!y) ? false : ( !x ? true : (*x) == (*y) ) ; |
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} |
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template<class OptionalPointee> |
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struct equal_pointees_t : std::binary_function<OptionalPointee,OptionalPointee,bool> |
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{ |
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bool operator() ( OptionalPointee const& x, OptionalPointee const& y ) const |
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{ return equal_pointees(x,y) ; } |
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} ; |
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// template<class OP> bool less_pointees(OP const& x, OP const& y); |
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// template<class OP> struct less_pointees_t; |
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// |
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// Being OP a model of OptionalPointee (either a pointer or an optional): |
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// |
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// If y has not a valid pointee, returns false. |
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// ElseIf x has not a valid pointee, returns true. |
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// ElseIf both x and y have valid pointees, returns the result of (*x < *y) |
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// No-throw |
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template<class OptionalPointee> |
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inline |
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bool less_pointees ( OptionalPointee const& x, OptionalPointee const& y ) |
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{ |
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return !y ? false : ( !x ? true : (*x) < (*y) ) ; |
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} |
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template<class OptionalPointee> |
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struct less_pointees_t : std::binary_function<OptionalPointee,OptionalPointee,bool> |
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{ |
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bool operator() ( OptionalPointee const& x, OptionalPointee const& y ) const |
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{ return less_pointees(x,y) ; } |
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} ; |
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} // namespace boost |
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#endif |
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