C++ Runnable Snippets

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Passing a function as parameter to another function

C++ has two ways to pass a function as a parameter.

#include <bits/stdc++.h> 
using namespace std;
int add(int x, int y){return x+y;}
int sub(int x, int y){return x-y;}
int operation (int x, int y,int (*function)(int,int)){return function(x,y);}
int operation2(int x, int y,std::function<int(int, int)> function){return function(x,y);}
int main()
{
    std::cout <<"Values 1 & 3. Pointer function: Add:"<<operation (1,3,&add)<<" Sub:"<<operation (1,3,&sub) << std::endl;
    std::cout <<"Values 1 & 3. std::function   : Add:"<<operation2(1,3,&add)<<" Sub:"<<operation2(1,3,&sub) << std::endl;
}

As you see, you can use either operation() or operation2() to give the same result.

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