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127 lines
3.2 KiB
C++
127 lines
3.2 KiB
C++
/// \file
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// Range v3 library
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//
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// Copyright Eric Niebler 2013-present
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// Copyright Casey Carter 2016
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//
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// Use, modification and distribution is subject to the
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// Boost Software License, Version 1.0. (See accompanying
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// 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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// Project home: https://github.com/ericniebler/range-v3
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//
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#ifndef RANGES_V3_FUNCTIONAL_COMPARISONS_HPP
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#define RANGES_V3_FUNCTIONAL_COMPARISONS_HPP
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#include <concepts/concepts.hpp>
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#include <range/v3/range_fwd.hpp>
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#include <range/v3/detail/prologue.hpp>
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namespace ranges
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{
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/// \addtogroup group-functional
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/// @{
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struct equal_to
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{
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template(typename T, typename U)(
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requires equality_comparable_with<T, U>)
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constexpr bool operator()(T && t, U && u) const
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{
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return (T &&) t == (U &&) u;
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}
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using is_transparent = void;
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};
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struct not_equal_to
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{
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template(typename T, typename U)(
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requires equality_comparable_with<T, U>)
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constexpr bool operator()(T && t, U && u) const
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{
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return !equal_to{}((T &&) t, (U &&) u);
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}
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using is_transparent = void;
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};
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struct less
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{
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template(typename T, typename U)(
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requires totally_ordered_with<T, U>)
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constexpr bool operator()(T && t, U && u) const
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{
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return (T &&) t < (U &&) u;
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}
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using is_transparent = void;
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};
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struct less_equal
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{
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template(typename T, typename U)(
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requires totally_ordered_with<T, U>)
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constexpr bool operator()(T && t, U && u) const
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{
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return !less{}((U &&) u, (T &&) t);
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}
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using is_transparent = void;
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};
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struct greater_equal
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{
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template(typename T, typename U)(
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requires totally_ordered_with<T, U>)
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constexpr bool operator()(T && t, U && u) const
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{
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return !less{}((T &&) t, (U &&) u);
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}
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using is_transparent = void;
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};
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struct greater
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{
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template(typename T, typename U)(
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requires totally_ordered_with<T, U>)
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constexpr bool operator()(T && t, U && u) const
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{
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return less{}((U &&) u, (T &&) t);
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}
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using is_transparent = void;
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};
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using ordered_less RANGES_DEPRECATED(
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"Repace uses of ranges::ordered_less with ranges::less") = less;
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#if __cplusplus > 201703L && __has_include(<compare>) && \
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defined(__cpp_concepts) && defined(__cpp_impl_three_way_comparison)
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struct compare_three_way
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{
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template(typename T, typename U)(
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requires three_way_comparable_with<T, U>)
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constexpr auto operator()(T && t, U && u) const
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-> decltype((T &&) t <=> (U &&) u)
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{
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return (T &&) t <=> (U &&) u;
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}
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using is_transparent = void;
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};
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#endif // __cplusplus
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namespace cpp20
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{
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using ranges::equal_to;
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using ranges::greater;
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using ranges::greater_equal;
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using ranges::less;
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using ranges::less_equal;
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using ranges::not_equal_to;
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} // namespace cpp20
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/// @}
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} // namespace ranges
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#include <range/v3/detail/epilogue.hpp>
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#endif
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