143 lines
4.0 KiB
Markdown
143 lines
4.0 KiB
Markdown
[logical.operations]
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# 22 General utilities library [[utilities]](./#utilities)
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## 22.10 Function objects [[function.objects]](function.objects#logical.operations)
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### 22.10.10 Logical operations [logical.operations]
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#### [22.10.10.1](#general) General [[logical.operations.general]](logical.operations.general)
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[1](#general-1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L12796)
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The library provides basic function object classes for all of the logical
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operators in the language ([[expr.log.and]](expr.log.and "7.6.14 Logical AND operator"), [[expr.log.or]](expr.log.or "7.6.15 Logical OR operator"), [[expr.unary.op]](expr.unary.op "7.6.2.2 Unary operators"))[.](#general-1.sentence-1)
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#### [22.10.10.2](#and) Class template logical_and [[logical.operations.and]](logical.operations.and)
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[ð](#lib:logical_and)
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`template<class T = void> struct logical_and {
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constexpr bool operator()(const T& x, const T& y) const;
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};
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`
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[ð](#lib:operator(),logical_and)
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`constexpr bool operator()(const T& x, const T& y) const;
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`
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[1](#and-1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L12815)
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*Returns*: x && y[.](#and-1.sentence-1)
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[ð](#lib:logical_and%3c%3e)
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`template<> struct logical_and<void> {
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template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
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-> decltype(std::forward<T>(t) && std::forward<U>(u));
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using is_transparent = unspecified;
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};
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`
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[ð](#lib:operator(),logical_and%3c%3e)
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`template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
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-> decltype(std::forward<T>(t) && std::forward<U>(u));
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`
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[2](#and-2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L12837)
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*Returns*: std::forward<T>(t) && std::forward<U>(u)[.](#and-2.sentence-1)
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#### [22.10.10.3](#or) Class template logical_or [[logical.operations.or]](logical.operations.or)
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[ð](#lib:logical_or)
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`template<class T = void> struct logical_or {
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constexpr bool operator()(const T& x, const T& y) const;
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};
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`
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[ð](#lib:operator(),logical_or)
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`constexpr bool operator()(const T& x, const T& y) const;
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`
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[1](#or-1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L12857)
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*Returns*: x || y[.](#or-1.sentence-1)
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[ð](#lib:logical_or%3c%3e)
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`template<> struct logical_or<void> {
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template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
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-> decltype(std::forward<T>(t) || std::forward<U>(u));
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using is_transparent = unspecified;
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};
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`
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[ð](#lib:operator(),logical_or%3c%3e)
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`template<class T, class U> constexpr auto operator()(T&& t, U&& u) const
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-> decltype(std::forward<T>(t) || std::forward<U>(u));
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`
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[2](#or-2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L12879)
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*Returns*: std::forward<T>(t) || std::forward<U>(u)[.](#or-2.sentence-1)
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#### [22.10.10.4](#not) Class template logical_not [[logical.operations.not]](logical.operations.not)
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[ð](#lib:logical_not)
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`template<class T = void> struct logical_not {
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constexpr bool operator()(const T& x) const;
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};
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`
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[ð](#lib:operator(),logical_not)
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`constexpr bool operator()(const T& x) const;
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`
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[1](#not-1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L12899)
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*Returns*: !x[.](#not-1.sentence-1)
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[ð](#lib:logical_not%3c%3e)
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`template<> struct logical_not<void> {
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template<class T> constexpr auto operator()(T&& t) const
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-> decltype(!std::forward<T>(t));
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using is_transparent = unspecified;
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};
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`
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[ð](#lib:operator(),logical_not%3c%3e)
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`template<class T> constexpr auto operator()(T&& t) const
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-> decltype(!std::forward<T>(t));
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`
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[2](#not-2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L12921)
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*Returns*: !std::forward<T>(t)[.](#not-2.sentence-1)
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