std::function

Simple example of using std::function 

#include <functional>

#include <iostream>

int sum(int x, int y, int z){

return x+y;

}

int check(std::function<int(int, int, int)> &s, int x, int y){

return s(x, y);

}

int main(){

std::function<int(int, int, int)> s(sum);

std::cout<<check(s, 10, 20)<<std::endl;

    // Here a datatype of std::function is define and passed to check,

   // which returns int and takes

    // three argument int, int, int types

}

To Create a std::function with template example:

template<class E>

bool h (const E& par1){

std::cout<<"This is correct";

return true;

}

template<class E>

E z(std::function<bool(const E&)> F){

}

int main(){

std::function < bool(const int&)> v(h<int>);

std::cout<<v(10);

}