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

std::modulus - cppreference.com

template< class T > struct modulus;

(until C++14)

template< class T = void > struct modulus;

(since C++14)

Function object for computing remainders of divisions. Implements operator% for type T.

[edit] Specializations

The standard library provides a specialization of std::modulus 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 remainder from the division of the first argument by the second argument
(public member function) std::modulus::operator()

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

(constexpr since C++14)

Returns the remainder of the division of lhs by rhs.

Parameters lhs, rhs - values to divide one by another 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;
}

[edit] See also

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