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1d42c4f6de
Per XLS-0095, we are taking steps to rename ripple(d) to xrpl(d). This change specifically removes all copyright notices referencing Ripple, XRPLF, and certain affiliated contributors upon mutual agreement, so the notice in the LICENSE.md file applies throughout. Copyright notices referencing external contributions remain as-is. Duplicate verbiage is also removed.
58 lines
1.2 KiB
C++
58 lines
1.2 KiB
C++
#ifndef XRPL_BASICS_COMPARATORS_H_INCLUDED
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#define XRPL_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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