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std::minus in C++
  • Difficulty Level : Expert
  • Last Updated : 27 Jul, 2017

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

Syntax :

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

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

Member types :
x : Type of the first argument in member operator()
y : Type of the second argument in member operator()
result_type : Type returned by member operator()




// C++ program to illustrate std::minus
// by subtracting all array elements from a number
#include <bits/stdc++.h>
  
int main()
{
    // Array with elements to be subtracted
    int arr[] = { 10, 20, 30 };
  
    // size of array
    int size = sizeof(arr) / sizeof(arr[0]);
  
    // Variable from which array is to be subtracted
    int num = 100;
  
    // Variable to store result
    int result;
  
    // using std::accumulate to perform subtraction on array from num
    // using std::minus
    result = std::accumulate(arr, arr + size, num, std::minus<int>());
  
    // Printing the result
    std::cout << "The result of 100-10-20-30 is " << result;
  
    return 0;
}

Output:

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

Another Example:




// C++ program to illustrate std::minus
// by subtracting the respective elements of 2 arrays
#include <iostream> // std::cout
#include <functional> // std::plus
#include <algorithm> // std::transform
  
int main()
{
    // First array
    int first[] = { 100, 200, 300, 400, 500 };
  
    // Second array
    int second[] = { 10, 20, 30, 40, 50 };
  
    // Result array
    int results[5];
  
    // std::transform applies std::minus to the whole array
    std::transform(first, first + 5, second, results, std::minus<int>());
  
    // Printing the result array
    for (int i = 0; i < 5; i++)
        std::cout << results[i] << " ";
  
    return 0;
}

Output:

90 180 270 360 450

This article is contributed by Rohit Thapliyal. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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