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cppdraft/func/not/fn.md

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+[func.not.fn]
+
+# 22 General utilities library [[utilities]](./#utilities)
+
+## 22.10 Function objects [[function.objects]](function.objects#func.not.fn)
+
+### 22.10.13 Function template not_fn [func.not.fn]
+
+[🔗](#lib:not_fn)
+
+`template<class F> constexpr unspecified not_fn(F&& f);
+`
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L13133)
+
+In the text that follows:
+
+- [(1.1)](#1.1)
+
+g is a value of the result of a not_fn invocation,
+
+- [(1.2)](#1.2)
+
+FD is the type decay_t<F>,
+
+- [(1.3)](#1.3)
+
+fd is the target object of g ([[func.def]](func.def "22.10.3 Definitions"))
+ of type FD,
+ direct-non-list-initialized with std​::​forward<F​>(f),
+
+- [(1.4)](#1.4)
+
+call_args is an argument pack
+ used in a function call expression ([[expr.call]](expr.call "7.6.1.3 Function call")) of g[.](#1.sentence-1)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L13145)
+
+*Mandates*: is_constructible_v<FD, F> && is_move_constructible_v<FD> is true[.](#2.sentence-1)
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L13150)
+
+*Preconditions*: FD meets the [*Cpp17MoveConstructible*](utility.arg.requirements#:Cpp17MoveConstructible "16.4.4.2 Template argument requirements [utility.arg.requirements]") requirements[.](#3.sentence-1)
+
+[4](#4)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L13154)
+
+*Returns*: A perfect forwarding call wrapper ([[func.require]](func.require#term.perfect.forwarding.call.wrapper "22.10.4 Requirements")) g with call pattern !invoke(fd, call_args...)[.](#4.sentence-1)
+
+[5](#5)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L13159)
+
+*Throws*: Any exception thrown by the initialization of fd[.](#5.sentence-1)
+
+[🔗](#lib:not_fn_)
+
+`template<auto f> constexpr unspecified not_fn() noexcept;
+`
+
+[6](#6)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L13170)
+
+In the text that follows:
+
+- [(6.1)](#6.1)
+
+F is the type of f,
+
+- [(6.2)](#6.2)
+
+g is a value of the result of a not_fn invocation,
+
+- [(6.3)](#6.3)
+
+call_args is an argument pack
+used in a function call expression ([[expr.call]](expr.call "7.6.1.3 Function call")) of g[.](#6.sentence-1)
+
+[7](#7)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L13182)
+
+*Mandates*: If is_pointer_v<F> || is_member_pointer_v<F> is true,
+then f != nullptr is true[.](#7.sentence-1)
+
+[8](#8)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L13187)
+
+*Returns*: A perfect forwarding call wrapper ([[func.require]](func.require "22.10.4 Requirements")) g that
+does not have state entities, and
+has the call pattern !invoke(f, call_args...)[.](#8.sentence-1)