tuple_transform.hpp

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#pragma once
 
#include <tuple>
 
namespace Nui::Detail
{
    template <typename Tuple, template <typename> typename Predicate>
    struct TupleTransform
    {};
 
    template <template <typename> typename Predicate, typename... List>
    struct TupleTransform<std::tuple<List...>, Predicate>
    {
        using type = std::tuple<typename Predicate<List>::type...>;
    };
 
    template <typename Tuple, template <typename> typename Predicate>
    using TupleTransform_t = typename TupleTransform<Tuple, Predicate>::type;
 
    template <typename Tuple, template <typename> typename Predicate>
    struct FlatTupleTransform
    {};
 
    template <template <typename> typename Predicate, typename... List>
    struct FlatTupleTransform<std::tuple<List...>, Predicate>
    {
        using type = decltype(std::tuple_cat(std::declval<typename Predicate<List>::type>()...));
    };
 
    template <typename Tuple, template <typename> typename Predicate>
    using FlatTupleTransform_t = typename FlatTupleTransform<Tuple, Predicate>::type;
}