109-lambda1.cpp

#include <iostream>
#include <vector>
#include <functional>

bool all_of(std::vector<int> const &V, std::function<bool(int)> condition)
{
    for (auto x : V)
        if (!condition(x))
            return false;
    return true;
}

int main()
{
    std::vector<int> V0{0, 0, 0, 0};
    std::vector<int> V1{0, 2, 4, 6, 8, 10};
    std::vector<int> V2{-2, -4, 0, 6, 10};
    std::vector<int> V3{6, 10, 17, 187};

    // auto is_even = [](int x) {
    //     return x % 2 == 0;
    // };
    // auto is_even = 3.4;

    auto is_even{[](int x) -> bool {
        return x % 2 == 0;
    }};
    // auto is_even { 3.4 };
    // auto is_even { "Asdasd" };
    // auto is_even { [](...){...} };

    auto is_positive{[](int x) -> bool {
        return x > 0;
    }};

    std::cout << "V0: is_even = " << all_of(V0, is_even) << std::endl;
    std::cout << "V1: is_even = " << all_of(V1, is_even) << std::endl;
    std::cout << "V2: is_even = " << all_of(V2, is_even) << std::endl;
    std::cout << "V3: is_even = " << all_of(V3, is_even) << std::endl;

    std::cout << "V0: is_positive = " << all_of(V0, is_positive) << std::endl;
    std::cout << "V1: is_positive = " << all_of(V1, is_positive) << std::endl;
    std::cout << "V2: is_positive = " << all_of(V2, is_positive) << std::endl;
    std::cout << "V3: is_positive = " << all_of(V3, is_positive) << std::endl;

    auto order{[](int x, int y) {
        return x < y;
    }};
    std::sort(V1.begin(), V1.end(), order);
    //int x{5}; foo(x);

    // std::sort(V1.begin(), V1.end(), [](int x, int y) {
    //     return x < y;
    // });
    //foo(5);

    for (auto v : V1)
    {
        std::cout << v << " ";
    }
    std::cout << std::endl;

    return 0;
}