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Showing content from https://cplusplus.com/reference/functional/minus/ below:

class template

std::minus

template <class T> struct minus;

Subtraction function object class

Binary function object class whose call returns the result of subtracting its second argument from its first argument (as returned by the binary operator -).

Generically, function objects are instances of a class with member function operator() defined. This member function allows the object to be used with the same syntax as a function call.

It is defined with the same behavior as:

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template <class T> struct minus : binary_function <T,T,T> {
  T operator() (const T& x, const T& y) const {return x-y;}
};

template <class T> struct minus {
  T operator() (const T& x, const T& y) const {return x-y;}
  typedef T first_argument_type;
  typedef T second_argument_type;
  typedef T result_type;
};

Objects of this class can be used on standard algorithms such as transform or accumulate.

Template parameters

T: Type of the arguments and return type of the functional call.
The type shall support the operation (binary operator-).

Member types member type definition notes first_argument_type T Type of the first argument in member operator() second_argument_type T Type of the second argument in member operator() result_type T Type returned by member operator()
Member functions

T operator() (const T& x, const T& y): Member function returning the subtraction of its arguments (x-y).

Example

// minus example
#include <iostream>     // std::cout
#include <functional>   // std::minus
#include <algorithm>    // std::transform

int main () {
  int numbers[]={10,20,30};
  int result;
  result = std::accumulate (numbers, numbers+3, 100, std::minus<int>());
  std::cout << "The result of 100-10-20-30 is " << result << ".\n";
  return 0;
}

Output:

The result of 100-10-20-30 is 40.