bit_struct.h

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#pragma once
 
#include "di/bit/bitset/prelude.h"
#include "di/bit/bitstruct/bit_tag.h"
#include "di/meta/algorithm.h"
#include "di/vocab/array/prelude.h"
#include "di/vocab/tuple/prelude.h"
 
namespace di::bit {
template<size_t byte_size, concepts::BitTag... Tags>
class [[gnu::packed]] BitStruct {
    using List = meta::List<Tags...>;
 
public:
    BitStruct() = default;
 
    template<concepts::BitTag... FromTags>
    requires(meta::Contains<List, FromTags> && ...)
    constexpr explicit BitStruct(FromTags... tags) {
        auto arguments = di::make_tuple(tags...);
        tuple_for_each(
            [&]<concepts::BitTag T>(T tag) {
                this->template set<T>(tag.get());
            },
            arguments);
    }
 
    template<concepts::BitTag Tag>
    constexpr void set(meta::BitValue<Tag> value) {
        Tag::value_into_bits(m_bitset, value);
    }
 
    template<concepts::BitTag Tag, typename R = meta::BitValue<Tag>>
    constexpr auto get() const -> R {
        return Tag::bits_into_value(m_bitset);
    }
 
private:
    BitSet<8 * byte_size> m_bitset;
};
}
 
namespace di {
using bit::BitStruct;
}