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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../ranges/../utility/functional/negate.html below:

std::negate - cppreference.com

template< class T > struct negate;

(until C++14)

template< class T = void > struct negate;

(since C++14)

Function object for performing negation. Effectively calls operator- on an instance of type T.

[edit] Specializations

The standard library provides a specialization of std::negate 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) T argument_type (deprecated in C++17)(removed in C++20) T

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

(until C++11) [edit] Member functions returns the negation of the argument
(public member function) std::negate::operator()

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

(constexpr since C++14)

Returns the negation of arg.

Parameters arg - value to compute negation of Return value

The result of -arg.

[edit] Exceptions

May throw implementation-defined exceptions.

Possible implementation

constexpr T operator()(const T& arg) const 
{
    return -arg;
}

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