template<typename Collection>
std::enable_if_t<
    !std::is_rvalue_reference_v<Collection&>,
    void
>
operator|(const Collection& col, int)
{
    cout<<"lvalue\n";
}

template<typename Collection>
std::enable_if_t<
    std::is_rvalue_reference_v<Collection&&>,
    void
>
operator|(Collection&& col, int)
{
    cout<<"rvalue\n";
}