[STL] for_each()

#include <algorithm>
#include <iostream>
#include <vector>
#include <iomanip>
#include <functional>
#include <iterator>



template<typename Collection, typename unop>
void for_each(Collection col, unop op) {
    std::for_each(col.begin(), col.end(), op);
}

int main()
{
    auto println = [](const char *message) { std::cout << "\n" << message << '\n'; };
    auto lambda_echo = [](int i) { std::cout << std::setw(3) << i; };
    std::vector<int> col{ 23, 23, 37, 42, 23, 23, 37 };

    // call for_each to print the vector
    println("running for_each<T>");
    for_each(col, lambda_echo);

    return 0;
}