tmp/tmpapkifa8m/{from.md → to.md}
RENAMED
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#### Exposition-only entities, etc. <a id="expos.only.entity">[[expos.only.entity]]</a>
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Several entities
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-
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-
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comment ending in *exposition only*.
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The following are defined for exposition only to aid in the
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specification of the library:
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``` cpp
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namespace std {
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template<class T>
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requires convertible_to<T, decay_t<T>>
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constexpr decay_t<T> decay-copy(T&& v)
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noexcept(is_nothrow_convertible_v<T, decay_t<T>>)
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{ return std::forward<T>(v); }
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constexpr auto synth-three-way =
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[]<class T, class U>(const T& t, const U& u)
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requires requires {
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{ t < u } -> boolean-testable;
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{ u < t } -> boolean-testable;
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}
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@@ -31,9 +30,19 @@ namespace std {
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return weak_ordering::equivalent;
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}
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};
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template<class T, class U = T>
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using synth-three-way-result =
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}
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```
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#### Exposition-only entities, etc. <a id="expos.only.entity">[[expos.only.entity]]</a>
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Several entities defined in [[support]] through [[exec]] and [[depr]]
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are only defined for the purpose of exposition. The declaration of such
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an entity is followed by a comment ending in *exposition only*.
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The following are defined for exposition only to aid in the
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specification of the library:
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``` cpp
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namespace std {
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template<class T>
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requires convertible_to<T, decay_t<T>>
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constexpr decay_t<T> decay-copy(T&& v) // exposition only
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noexcept(is_nothrow_convertible_v<T, decay_t<T>>)
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{ return std::forward<T>(v); }
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constexpr auto synth-three-way = // exposition only
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[]<class T, class U>(const T& t, const U& u)
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requires requires {
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{ t < u } -> boolean-testable;
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{ u < t } -> boolean-testable;
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}
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return weak_ordering::equivalent;
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}
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};
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template<class T, class U = T>
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using synth-three-way-result = // exposition only
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decltype(synth-three-way(declval<T&>(), declval<U&>()));
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}
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```
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An object `dst` is said to be *decay-copied from* a subexpression `src`
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if the type of `dst` is
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``` cpp
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decay_t<decltype((src))>
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```
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and `dst` is copy-initialized from `src`.
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