forward_like.hpp

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#ifndef LIBFILEZILLA_FORWARD_LIKE_HEADER
#define LIBFILEZILLA_FORWARD_LIKE_HEADER
 
#include <type_traits>

 
namespace fz {
 
namespace detail {

    template <class T, class U>
    using apply_value_category_t = std::conditional_t<
        std::is_lvalue_reference_v<T>,
        std::remove_reference_t<U>&,
        std::remove_reference_t<U>&&
    >;
 
}

template <class T, class U>
constexpr detail::apply_value_category_t<T, U> forward_like(U && u) noexcept
{
    return static_cast<detail::apply_value_category_t<T, U>>(u);
}
 
}
 
#endif // LIBFILEZILLA_FORWARD_LIKE_HEADER