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clean-up

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This commit is contained in:
neargye 2022-02-16 19:18:43 +02:00
parent 756b139368
commit 4e39c3ba55
1 changed files with 12 additions and 11 deletions
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23
include/magic_enum.hpp
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@ -910,18 +910,23 @@ template <typename E>
namespace fusion_detail {
template <typename E>
constexpr std::size_t fuse_one_enum(std::size_t hash, E value) noexcept {
// Add 1 to prevent matching 2D fusions with 3D fusions etc.
return (hash << detail::log2(enum_count<E>() + 1)) | (enum_index(value).value() + 1);
constexpr std::optional<std::size_t> fuse_one_enum(std::optional<std::size_t> hash, E value) noexcept {
if (hash.has_value()) {
if (const auto index = enum_index(value); index.has_value()) {
// Add 1 to prevent matching 2D fusions with 3D fusions etc.
return (hash.value() << detail::log2(enum_count<E>() + 1)) | (index.value() + 1);
}
}
return std::nullopt;
}
template <typename E>
constexpr std::size_t fuse_enum(E value) noexcept {
constexpr std::optional<std::size_t> fuse_enum(E value) noexcept {
return fuse_one_enum(0, value);
}
template <typename E, typename... Es>
constexpr std::size_t fuse_enum(E head, Es... tail) noexcept {
constexpr std::optional<std::size_t> fuse_enum(E head, Es... tail) noexcept {
return fuse_one_enum(fuse_enum(tail...), head);
}
@ -932,12 +937,8 @@ template <typename... Es>
[[nodiscard]] constexpr auto enum_fuse(Es... values) -> std::enable_if_t<(std::is_enum_v<std::decay_t<Es>> && ...), std::optional<std::size_t>> {
static_assert(sizeof...(Es) >= 2, "magic_enum::enum_fuse requires at least 2 enums");
static_assert((detail::log2(enum_count<Es>() + 1) + ...) <= (sizeof(std::size_t) * 8), "magic_enum::enum_fuse does not work for large enums");
const bool has_values = (enum_index(values).has_value() && ...);
if (has_values) {
return fusion_detail::fuse_enum(values...);
} else {
return assert(has_values), std::nullopt;
}
const auto fuse = fusion_detail::fuse_enum(values...);
return assert(fuse.has_value()), fuse;
}
namespace ostream_operators {