112-lambda4.cpp

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

void for_each(std::vector<int> const &V, std::function<void(int)> element_function)
{
    for (auto x : V)
        element_function(x);
}

/* Given a vector of ints and an element, return true if the provided
   element appears in the vector and false otherwise. */
bool search(std::vector<int> &V, int element)
{
    //Task write this function without any loops
    int super_secret_variable{42};
    bool found{false};
    auto fun{
        [&found, element](int x) {
            if (x == element)
                found = true;

            // super_secret_variable = 10;
        }};

    // auto fun{
    //     [&](int x) {
    //         if (x == element)
    //             found = true;
    //         V.push_back(10);
    //         // super_secret_variable = 10;
    //     }};

    for_each(V, fun);

    // std::cout << super_secret_variable << std::endl;

    return found;
}

int main()
{
    std::vector<int> V{6, 10, 17};

    std::cout << "Does V contain 6? ";
    if (search(V, 6))
        std::cout << "Yes." << std::endl;
    else
        std::cout << "No." << std::endl;

    std::cout << "Does V contain 10? ";
    if (search(V, 10))
        std::cout << "Yes." << std::endl;
    else
        std::cout << "No." << std::endl;

    std::cout << "Does V contain 187? ";
    if (search(V, 187))
        std::cout << "Yes." << std::endl;
    else
        std::cout << "No." << std::endl;
    return 0;
}