tmp/tmpufj99fu5/{from.md → to.md}
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| 1 |
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### Header `<compare>` synopsis <a id="compare.syn">[[compare.syn]]</a>
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The header `<compare>` specifies types, objects, and functions for use
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primarily in connection with the three-way comparison operator
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[[expr.spaceship]].
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``` cpp
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namespace std {
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// [cmp.categories], comparison category types
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class partial_ordering;
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class weak_ordering;
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class strong_ordering;
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// named comparison functions
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constexpr bool is_eq (partial_ordering cmp) noexcept { return cmp == 0; }
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constexpr bool is_neq (partial_ordering cmp) noexcept { return cmp != 0; }
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constexpr bool is_lt (partial_ordering cmp) noexcept { return cmp < 0; }
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constexpr bool is_lteq(partial_ordering cmp) noexcept { return cmp <= 0; }
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constexpr bool is_gt (partial_ordering cmp) noexcept { return cmp > 0; }
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constexpr bool is_gteq(partial_ordering cmp) noexcept { return cmp >= 0; }
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// [cmp.common], common comparison category type
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template<class... Ts>
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struct common_comparison_category {
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using type = see below;
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};
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template<class... Ts>
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using common_comparison_category_t = typename common_comparison_category<Ts...>::type;
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// [cmp.concept], concept three_way_comparable
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template<class T, class Cat = partial_ordering>
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concept three_way_comparable = see below;
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template<class T, class U, class Cat = partial_ordering>
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concept three_way_comparable_with = see below;
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// [cmp.result], result of three-way comparison
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template<class T, class U = T> struct compare_three_way_result;
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template<class T, class U = T>
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using compare_three_way_result_t = typename compare_three_way_result<T, U>::type;
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// [comparisons.three.way], class compare_three_way
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struct compare_three_way;
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// [cmp.alg], comparison algorithms
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inline namespace unspecified {
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inline constexpr unspecified strong_order = unspecified;
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inline constexpr unspecified weak_order = unspecified;
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inline constexpr unspecified partial_order = unspecified;
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inline constexpr unspecified compare_strong_order_fallback = unspecified;
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inline constexpr unspecified compare_weak_order_fallback = unspecified;
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inline constexpr unspecified compare_partial_order_fallback = unspecified;
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}
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}
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```
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