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std::logical_not

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< cpp‎ | utility‎ | functional
 
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Defined in header <functional>
template< class T >
struct logical_not;
 (until C++14)
template< class T = void >
struct logical_not;
 (since C++14)

Function object for performing logical NOT (logical negation). Effectively calls operator! for type T.

Contents

[edit] Specializations

The standard library provides a specialization of std::logical_not when T is not specified, which leaves the parameter types and return type to be deduced.

(C++14)
 function object implementing !x deducing parameter and return types
(class template specialization) [edit]
(since C++14)

[edit] Member types

Type Definition
result_type (deprecated in C++17)(removed in C++20) bool
argument_type (deprecated in C++17)(removed in C++20) T

These member types are obtained via publicly inheriting std::unary_function<T, bool>.

(until C++11)

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