std::minus in C++
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