---
name: "std::experimental::_Not_fn"
section: "3cxx"
platform: "linux"
package: "libstdc++-6-doc"
version: "6.3.0-18+deb9u1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/std::experimental::_Not_fn"
---

# std::experimental::\_Not\_fn(3cxx)

Generalized negator.

## NAME

std::experimental::\_Not\_fn\< \_Fn \> - Generalized negator.

## SYNOPSIS

### Public Member Functions

template\<typename \_Fn2 \> **\_Not\_fn** (\_Fn2 &&\_\_fn, int)\
 **\_Not\_fn** (const **\_Not\_fn** &\_\_fn)=default\
 **\_Not\_fn** (**\_Not\_fn** &&\_\_fn)=default\
 template\<typename... \_Args\> auto **operator()** (\_Args &&... \_\_args) noexcept(noexcept(!\_M\_fn(**std::forward**\< \_Args \>(\_\_args)...))) -\> decltype(!\_M\_fn(**std::forward**\< \_Args \>(\_\_args)...))\
 template\<typename... \_Args\> auto **operator()** (\_Args &&... \_\_args) const noexcept(noexcept(!\_M\_fn(**std::forward**\< \_Args \>(\_\_args)...))) -\> decltype(!\_M\_fn(**std::forward**\< \_Args \>(\_\_args)...))\
 template\<typename... \_Args\> auto **operator()** (\_Args &&... \_\_args) volatile noexcept(noexcept(!\_M\_fn(**std::forward**\< \_Args \>(\_\_args)...))) -\> decltype(!\_M\_fn(**std::forward**\< \_Args \>(\_\_args)...))\
 template\<typename... \_Args\> auto **operator()** (\_Args &&... \_\_args) const volatile noexcept(noexcept(!\_M\_fn(**std::forward**\< \_Args \>(\_\_args)...))) -\> decltype(!\_M\_fn(**std::forward**\< \_Args \>(\_\_args)...))\
 **\_Not\_fn** & **operator=** (const **\_Not\_fn** &\_\_fn)=default\
 **\_Not\_fn** & **operator=** (**\_Not\_fn** &&\_\_fn)=default\

## Detailed Description

### template\<typename \_Fn\>

class std::experimental::\_Not\_fn\< \_Fn \>" Generalized negator.

Definition at line 383 of file experimental/functional.

## Author

Generated automatically by Doxygen for libstdc++ from the source code.