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🐛 Workaround GCC issue with type_map #426

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Merged
elbeno merged 1 commit into from
Oct 8, 2026
Merged

🐛 Workaround GCC issue with type_map #426

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30 changes: 14 additions & 16 deletions include/stdx/utility.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -31,8 +31,8 @@ template <typename T> struct map_value_helper {
};
template <typename T> map_value_helper(T) -> map_value_helper<T>;

template <auto V> struct map_value_t {
constexpr static inline auto value = V;
template <map_value_helper V> struct map_value_t {
constexpr static inline auto value = V.value;
};

template <typename... Ts> struct type_map : Ts... {};
Expand All @@ -45,13 +45,12 @@ template <typename K, typename V> struct type_pair {
using value_type = V;
};
template <typename K, typename V> using tt_pair = type_pair<K, V>;
template <detail::map_value_helper K, typename V, typename = void>
using vt_pair = tt_pair<detail::map_value_t<K.value>, V>;
template <detail::map_value_helper K, typename V>
using vt_pair = tt_pair<detail::map_value_t<K>, V>;
template <typename K, detail::map_value_helper V>
using tv_pair = tt_pair<K, detail::map_value_t<V.value>>;
using tv_pair = tt_pair<K, detail::map_value_t<V>>;
template <detail::map_value_helper K, detail::map_value_helper V>
using vv_pair =
tt_pair<detail::map_value_t<K.value>, detail::map_value_t<V.value>>;
using vv_pair = tt_pair<detail::map_value_t<K>, detail::map_value_t<V>>;

template <typename... Ts> using type_map = shrink_t<detail::type_map<Ts...>>;

Expand Down Expand Up @@ -82,12 +81,11 @@ using reverse_type_lookup_t =

template <typename M, detail::map_value_helper K, typename Default = missing_t>
using value_lookup_t =
decltype(detail::lookup<detail::map_value_t<K.value>, Default>(
expand<M>()));
decltype(detail::lookup<detail::map_value_t<K>, Default>(expand<M>()));

template <typename M, detail::map_value_helper V, typename Default = missing_t>
using reverse_value_lookup_t =
decltype(detail::reverse_lookup<detail::map_value_t<V.value>, Default>(
decltype(detail::reverse_lookup<detail::map_value_t<V>, Default>(
expand<M>()));

namespace detail {
Expand All @@ -99,29 +97,29 @@ template <typename M, typename K, detail::map_value_helper Default = missing>
constexpr static auto type_lookup_v =
type_or_t<detail::is_present,
decltype(detail::lookup<K, missing_t>(expand<M>())),
detail::map_value_t<Default.value>>::value;
detail::map_value_t<Default>>::value;

template <typename M, typename V, detail::map_value_helper Default = missing>
constexpr static auto reverse_type_lookup_v =
type_or_t<detail::is_present,
decltype(detail::reverse_lookup<V, missing_t>(expand<M>())),
detail::map_value_t<Default.value>>::value;
detail::map_value_t<Default>>::value;

template <typename M, detail::map_value_helper K,
detail::map_value_helper Default = missing>
constexpr static auto value_lookup_v =
type_or_t<detail::is_present,
decltype(detail::lookup<detail::map_value_t<K.value>, missing_t>(
decltype(detail::lookup<detail::map_value_t<K>, missing_t>(
expand<M>())),
detail::map_value_t<Default.value>>::value;
detail::map_value_t<Default>>::value;

template <typename M, detail::map_value_helper V,
detail::map_value_helper Default = missing>
constexpr static auto reverse_value_lookup_v =
type_or_t<detail::is_present,
decltype(detail::reverse_lookup<detail::map_value_t<V.value>,
decltype(detail::reverse_lookup<detail::map_value_t<V>,
missing_t>(expand<M>())),
detail::map_value_t<Default.value>>::value;
detail::map_value_t<Default>>::value;

template <typename T, typename U>
[[nodiscard]] constexpr auto forward_like(U &&u) noexcept -> decltype(auto) {
Expand Down