Pack.hpp

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#ifndef PACK_HPP_
#define PACK_HPP_
 
#include <tuple>
 
namespace capy::meta
{

template<typename UnitType>
struct Unit {
    using InnerType = UnitType;
};
 
template<typename Unit_>
using unit_inner_type_t = typename Unit_::InnerType;

template<typename... Types>
struct Pack {};
 
template<typename Pack_>
constexpr std::size_t pack_size_v = []<typename... Types>(Pack<Types...>&&) {
    return sizeof...(Types);
}(Pack_{});
 
template<typename Pack_>
constexpr bool pack_is_empty_v = pack_size_v<Pack_> == 0;

template<auto Value>
struct ValueUnit {};

template<typename ValueUnit_>
struct UnwrapValueUnit;

template<auto Value>
struct UnwrapValueUnit<ValueUnit<Value>>
{
    static constexpr auto value = Value;
};

template<typename ValueUnit_>
static constexpr auto unwrap_value_unit_v = UnwrapValueUnit<ValueUnit_>::value;

template<
    template<typename> typename
> 
struct UnaryMetaFunction {};

using EmptyPack = Pack<>;

template<typename Pack_, template<typename...> typename Template>
struct RebindPack;

template<template<typename...> typename Template, typename... Elements>
struct RebindPack<Pack<Elements...>, Template>
{
    using type = Template<Elements...>;
};

template<typename Pack_, template<typename...> typename Template>
using rebind_pack_t = typename RebindPack<Pack_, Template>::type;
 
}
 
#endif // !PACK_HPP_