tmp/tmpl6pidult/{from.md → to.md}
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### Concept
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``` cpp
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template<class T, class Cat>
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concept compares-as = // exposition only
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same_as<common_comparison_category_t<T, Cat>, Cat>;
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@@ -56,32 +56,37 @@ and `Cat` model `three_way_comparable<T, Cat>` only if:
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``` cpp
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template<class T, class U, class Cat = partial_ordering>
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concept three_way_comparable_with =
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three_way_comparable<T, Cat> &&
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three_way_comparable<U, Cat> &&
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-
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three_way_comparable<
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common_reference_t<const remove_reference_t<T>&, const remove_reference_t<U>&>, Cat> &&
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weakly-equality-comparable-with<T, U> &&
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partially-ordered-with<T, U> &&
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requires(const remove_reference_t<T>& t, const remove_reference_t<U>& u) {
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{ t <=> u } -> compares-as<Cat>;
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{ u <=> t } -> compares-as<Cat>;
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};
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```
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Let `t` and `
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`const remove_reference_t<
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`common_reference_t<const remove_reference_t<T>&, const remove_reference_t<U>&>`.
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-
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-
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- `t <=> u` and `u <=> t` have the same domain,
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- `((t <=> u) <=> 0)` and `(0 <=> (u <=> t))` are equal,
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- `(t <=> u == 0) == bool(t == u)` is `true`,
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- `(t <=> u != 0) == bool(t != u)` is `true`,
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- `Cat(t <=> u) == Cat(C(
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- `(t <=> u < 0) == bool(t < u)` is `true`,
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- `(t <=> u > 0) == bool(t > u)` is `true`,
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- `(t <=> u <= 0) == bool(t <= u)` is `true`,
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- `(t <=> u >= 0) == bool(t >= u)` is `true`, and
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- if `Cat` is convertible to `strong_ordering`, `T` and `U` model
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### Concept <a id="cmp.concept">[[cmp.concept]]</a>
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``` cpp
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template<class T, class Cat>
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concept compares-as = // exposition only
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same_as<common_comparison_category_t<T, Cat>, Cat>;
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``` cpp
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template<class T, class U, class Cat = partial_ordering>
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concept three_way_comparable_with =
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three_way_comparable<T, Cat> &&
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three_way_comparable<U, Cat> &&
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comparison-common-type-with<T, U> &&
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three_way_comparable<
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common_reference_t<const remove_reference_t<T>&, const remove_reference_t<U>&>, Cat> &&
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weakly-equality-comparable-with<T, U> &&
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partially-ordered-with<T, U> &&
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requires(const remove_reference_t<T>& t, const remove_reference_t<U>& u) {
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{ t <=> u } -> compares-as<Cat>;
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{ u <=> t } -> compares-as<Cat>;
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};
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```
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Let `t` and `t2` be lvalues denoting distinct equal objects of types
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`const remove_reference_t<T>` and `remove_cvref_t<T>`, respectively, and
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let `u` and `u2` be lvalues denoting distinct equal objects of types
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`const remove_reference_t<U>` and `remove_cvref_t<U>`, respectively. Let
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`C` be
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`common_reference_t<const remove_reference_t<T>&, const remove_reference_t<U>&>`.
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Let `CONVERT_TO_LVALUE<C>(E)` be defined as in
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[[concepts.compare.general]]. `T`, `U`, and `Cat` model
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`three_way_comparable_with<T, U, Cat>` only if:
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- `t <=> u` and `u <=> t` have the same domain,
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- `((t <=> u) <=> 0)` and `(0 <=> (u <=> t))` are equal,
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- `(t <=> u == 0) == bool(t == u)` is `true`,
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- `(t <=> u != 0) == bool(t != u)` is `true`,
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- `Cat(t <=> u) == Cat(CONVERT_TO_LVALUE<C>(t2) <=>
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CONVERT_TO_LVALUE<C>(u2))` is `true`,
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- `(t <=> u < 0) == bool(t < u)` is `true`,
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- `(t <=> u > 0) == bool(t > u)` is `true`,
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- `(t <=> u <= 0) == bool(t <= u)` is `true`,
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- `(t <=> u >= 0) == bool(t >= u)` is `true`, and
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- if `Cat` is convertible to `strong_ordering`, `T` and `U` model
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