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

std::multiplies - cppreference.com

template< class T > struct multiplies;

(until C++14)

template< class T = void > struct multiplies;

(since C++14)

Function object for performing multiplication. Effectively calls operator* on two instances of type T.

[edit] Specializations

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

function object implementing x * y 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 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) [edit] Member functions returns the product of two arguments
(public member function) std::multiplies::operator()

T operator()( const T& lhs, const T& rhs ) const;

(constexpr since C++14)

Returns the product of lhs and rhs.

Parameters lhs, rhs - values to multiply Return value

The result of lhs * rhs.

[edit] 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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