functionandbind.cpp

#include <iostream>
#include <functional>

using namespace std;
using namespace std::placeholders;

int add(int a, int b) {
    return a+b;
}

int subtract(int a, int b) {
    return a-b;
}

int range_check(std::function<int(int,int)> func, int a, int b) {
    cout << "Range check\n";
    if (a>5) {
        cout << "A is greater than 5\n";
    }
    if (b<6) {
        cout << "B is less than 6\n";
    }
    return func(a,b);
}

auto rangeCheckedAdd = bind(range_check, add, _1, _2);
auto rangeCheckedSubtract = bind(range_check, subtract, _1, _2);

int main() {
    cout << "hello\n";
    int a = 10;
    int b = 5;

    cout << a << "+" << b << "=" << add(a,b) << "\n";
    cout << a << "-" << b << "=" << subtract(a,b) << "\n";

    cout << a << "+" << b << "=" << range_check(add,a,b) << "\n";

    cout << "New add:" << a << "+" << b << "=" << rangeCheckedAdd(a,b) << "\n";
    cout << "New subtract:" << a << "-" << b << "=" << rangeCheckedSubtract(a,b) << "\n";

    return 0;
}