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3e152fec74
This change refactors the codebase to use the "east const convention", and adds a clang-format rule to follow this convention.
77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2012, 2013 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#ifndef RIPPLE_BASICS_COMPARATORS_H_INCLUDED
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#define RIPPLE_BASICS_COMPARATORS_H_INCLUDED
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#include <functional>
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namespace ripple {
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#ifdef _MSC_VER
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/*
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* MSVC 2019 version 16.9.0 added [[nodiscard]] to the std comparison
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* operator() functions. boost::bimap checks that the comparitor is a
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* BinaryFunction, in part by calling the function and ignoring the value.
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* These two things don't play well together. These wrapper classes simply
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* strip [[nodiscard]] from operator() for use in boost::bimap.
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*
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* See also:
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* https://www.boost.org/doc/libs/1_75_0/libs/bimap/doc/html/boost_bimap/the_tutorial/controlling_collection_types.html
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*/
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template <class T = void>
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struct less
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{
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using result_type = bool;
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constexpr bool
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operator()(T const& left, T const& right) const
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{
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return std::less<T>()(left, right);
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}
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};
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template <class T = void>
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struct equal_to
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{
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using result_type = bool;
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constexpr bool
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operator()(T const& left, T const& right) const
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{
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return std::equal_to<T>()(left, right);
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}
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};
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#else
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template <class T = void>
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using less = std::less<T>;
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template <class T = void>
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using equal_to = std::equal_to<T>;
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#endif
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} // namespace ripple
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#endif
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