C++ Transform a std::tuple to a std::vector or std::deque

Question

In the simple parser library I am writing, the results of multiple parsers is combined using std::tuple_cat. But when applying a parser that returns the same result

Answer 1

Here's one way to do it:

#include 
#include 
#include 
#include 

template
auto to_vector_helper(const tuple_type &t, std::index_sequence)
{
    return std::vector{
        std::get(t)...
            };
}

template
auto to_vector(const std::tuple &t)
{
    typedef typename std::remove_reference::type tuple_type;

    constexpr auto s =
        std::tuple_size::value;

    return to_vector_helper
        (t, std::make_index_sequence{});
}

int main()
{
    std::tuple t{2,3};

    std::vector v=to_vector(t);

    std::cout << v[0] << ' ' << v[1] << ' ' << v.size() << std::endl;
    return 0;
}