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std::minus

Defined in header `<functional>`
template< class T > struct minus;		(until C++14)
template< class T = void > struct minus;		(since C++14)

Function object for performing subtraction. Effectively calls operator- on two instances of type T.

Specializations

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

minus<void>

(C++14)

function object implementing x - y deducing argument and return types
(class template specialization)

(since C++14)

Member types

Type	Definition
`result_type` (deprecated in C++17)(removed in C++20)	`T`
`first_argument_type` (deprecated in C++17)(removed in C++20)	`T`
`second_argument_type` (deprecated in C++17)(removed in C++20)	`T`

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

(until C++11)

Member functions

operator()

returns the difference between two arguments
(public member function)

std::minus::operator()

T operator()( const T& lhs, const T& rhs ) const;		(until C++14)
constexpr T operator()( const T& lhs, const T& rhs ) const;		(since C++14)

Returns the difference between lhs and rhs.

Parameters

lhs, rhs

values to subtract from one another

Return value

The result of lhs - rhs.

Exceptions

May throw implementation-defined exceptions.

Possible implementation

constexpr T operator()(const T &lhs, const T &rhs) const 
{
    return lhs - rhs;
}

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