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#pragma once
#include "compat/assert.hpp"
#include <type_traits>
#include <tuple>
#include <concepts>
namespace floormat::detail_Pack_output {
template<size_t N>
struct output_bits final
{
static_assert(N > 0);
static_assert(N < sizeof(size_t)*8);
static constexpr size_t length = N;
};
template<std::unsigned_integral T, size_t CAPACITY>
struct output
{
static_assert(std::is_fundamental_v<T>);
static_assert(CAPACITY <= sizeof(T)*8);
static constexpr size_t Capacity = CAPACITY;
T value{0};
};
template<typename T, size_t LENGTH>
struct output_field
{
T value;
static constexpr size_t Length = LENGTH;
};
template<std::unsigned_integral Type, typename Tuple> struct count_bits_;
template <std::size_t ... Is>
constexpr std::index_sequence<sizeof...(Is)-1uz-Is...> reverse_index_sequence(std::index_sequence<Is...> const&);
template <std::size_t N>
using make_reverse_index_sequence = decltype(reverse_index_sequence(std::make_index_sequence<N>{}));
template<typename T, size_t Capacity, size_t Left, size_t I, size_t... Is, typename Tuple>
constexpr T write_(const Tuple& tuple, output<T, Left> st, output_bits<Capacity>, std::index_sequence<I, Is...>)
{
static_assert(Capacity <= sizeof(T)*8);
static_assert(Left <= Capacity);
constexpr size_t N = std::tuple_element_t<I, Tuple>::Length;
static_assert(N <= Left);
T x = std::get<I>(tuple).value;
T value = T(T(st.value << N) | x);
return write_(tuple, output<T, Left - N>{value}, output_bits<Capacity>{}, std::index_sequence<Is...>{});
}
template<typename T, size_t Capacity, size_t Left, typename Tuple>
constexpr T write_(const Tuple&, output<T, Left> st, output_bits<Capacity>, std::index_sequence<>)
{
return st.value;
}
} // namespace floormat::detail_Pack_output
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