46 lines
1.5 KiB
Markdown
46 lines
1.5 KiB
Markdown
[func.invoke]
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# 22 General utilities library [[utilities]](./#utilities)
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## 22.10 Function objects [[function.objects]](function.objects#func.invoke)
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### 22.10.5 invoke functions [func.invoke]
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[ð](#lib:invoke)
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`template<class F, class... Args>
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constexpr invoke_result_t<F, Args...> invoke(F&& f, Args&&... args)
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noexcept(is_nothrow_invocable_v<F, Args...>);
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`
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11626)
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*Constraints*: is_invocable_v<F, Args...> is true[.](#1.sentence-1)
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11630)
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*Returns*: *INVOKE*(std::forward<F>(f), std::forward<Args>(args)...) ([[func.require]](func.require "22.10.4 Requirements"))[.](#2.sentence-1)
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[ð](#lib:invoke_r)
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`template<class R, class F, class... Args>
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constexpr R invoke_r(F&& f, Args&&... args)
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noexcept(is_nothrow_invocable_r_v<R, F, Args...>);
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`
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[3](#3)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11643)
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*Constraints*: is_invocable_r_v<R, F, Args...> is true[.](#3.sentence-1)
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[4](#4)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11647)
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*Returns*: *INVOKE*<R>(std::forward<F>(f), std::forward<Args>(args)...) ([[func.require]](func.require "22.10.4 Requirements"))[.](#4.sentence-1)
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