#include <cassert>
#include <forward_list>
#include <initializer_list>
#include <set>
#include <vector>


int main()
{
    {
        int index { 0 };
        std::vector<int> v { 0, 1, 2, 3 };
        for (auto i : select_indices(v, { 0, 1, 2, 3 }))
        {
            assert(i == index++);
        }
    }


    {
        std::vector<double> v { 1.2, 3.45, 6.78, 9.0 };
        auto range { select_indices(v, { 0, 0, 1, 0, 2 }) };
        
        std::vector<double> result { range.begin(), range.end() };
        assert(( result == std::vector<double>{ 1.2, 1.2, 3.45, 1.2, 6.78 } ));
    }
    
    {
        std::set<std::string> v { "a", "b", "c", "d" };
        auto range { select_indices(v, { 0, 1, 1, 0 }) };
        
        std::vector<std::string> result { range.begin(), range.end() };
        assert(( result == std::vector<std::string>{ "a", "b", "b", "a" } ));
    }
    
    {
        std::forward_list<int> v { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 };
        auto range { select_indices(v, { 0, 2, 6, 10 }) };
        
        std::vector<int> result { range.begin(), range.end() };
        assert(( result == std::vector<int>{ 1, 3, 7, 11 } ));
    }
}