Passing lambdas as values

functionalcpp.cpp

#include <functional>


int g(int x, int y) {
    auto lambda = [] <typename T>(std::function<T(T,T)> f, T x, T y) { return f(x,y); };
    std::function<int(int,int)> f = [](int x, int y)->int {return x + y;};
    return lambda(f, x,y);
}


int g2(int x, int y) {
    auto lambda = [] <typename FNC, typename T>(FNC f, T x, T y) { return f(x,y); };
    return lambda([](int x, int y)->int {return x + y;}, x,y);
}



int g3(int x, int y) {
    auto lambda = [] (auto f, auto x, auto y) { return f(x,y); };
    return lambda([](int x, int y)->int {return x + y;}, x,y);
}