repos/CallbackFunctions/CallbackFunctions/CallbackFunctions.cpp

// CallbackFunctions.cpp : Diese Datei enthält die Funktion "main". Hier beginnt und endet die Ausführung des Programms.
//
#include <iostream>
#include <vector>


using namespace std;

void print(vector<int> v) {
    for (auto x : v) cout << x << " ";
    cout << endl;
}

/*
    []:  can only access variables which are local to it.
    [&]: capture all external variables by reference.
    [=]: capture all external variables by value.
    [a, &b]: capture ‘a’ by value and ‘b’ by reference.

*/




int main() {
    vector<int> v1, v2;

    // Capture v1 and v2 by reference
    auto byRef = [&](int m) {
        v1.push_back(m);
        v2.push_back(m);
        };

    // Capture v1 and v2 by value
    auto byVal = [=](int m) mutable {
        v1.push_back(m);
        v2.push_back(m);
        };

    // Capture v1 by reference and v2 by value
    auto mixed = [=, &v1](int m) mutable {
        v1.push_back(m);
        v2.push_back(m);
        };

    // Push 20 in both v1 and v2
    byRef(20);

    // Push 234 in both v1 and v2
    byVal(234);

    // Push 10 in both v1 and v2
    mixed(10);

    print(v1);
    print(v2);

    return 0;
}