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Showing content from https://en.cppreference.com/w/cpp/language/../header/../utility/functional/logical_not.html below:

std::logical_not - cppreference.com

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.

[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.

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) [edit] Member functions returns the logical NOT of the argument
(public member function) std::logical_not::operator()

bool operator()( const T& arg ) const;

(constexpr since C++14)

Returns the logical NOT of arg.

Parameters arg - value to compute logical NOT of Return value

The result of !arg.

[edit] Exceptions

May throw implementation-defined exceptions.

Possible implementation

constexpr // since C++14
bool operator()(const T& arg) const 
{
    return !arg;
}

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