#include <chain.hpp>

#include <vector>

#include <string>

#include <list>

#include <iostream>

#include <array>

int main() {

// chaining combines two sequences for iteration

std::vector<int> ivec = {1, 4, 7, 9};

std::vector<int> lvec = {100, 200, 300, 400, 500, 600};

std::cout << "chaining two int vectors together:\n";

for (auto&& e : iter::chain(ivec, lvec)) {

std::cout << e << ' ';

}

std::cout << '\n';

std::vector<char> vec1 = {'c', 'h'};

std::array<char,4> arr1{{'a', 'i', 'n', 'i'}};

std::string s{"ng different "};

std::list<char> lst = {'t', 'y', 'p', 'e', 's'};

// chain can mix different sequence types as long as the type yielded

// by their underlying iterators is *exactly* the same

std::cout << "mixing: ";

for (auto&& c : iter::chain(vec1, arr1, s, lst)) {

std::cout << c;

}

std::cout << '\n';

std::vector<std::vector<int>> matrix = {

{2, 4, 6},

{8, 10, 12},

{14, 16, 18}

};

// chain.from_iterable effectively flattens a sequence by one level

std::cout << "chain.from_iterable to flatten matrix:\n";

for (auto&& i : iter::chain.from_iterable(matrix)) {

std::cout << i << ' ';

}

std::cout << '\n';

}