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🐛 Fix ICE with use of __typeof__ #261

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Merged
merged 1 commit into from
Aug 12, 2025
Merged

🐛 Fix ICE with use of __typeof__ #261

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16 changes: 13 additions & 3 deletions include/stdx/utility.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -145,13 +145,23 @@ struct from_any {
constexpr operator int() const { return 0; }
};

struct value_marker {};

struct type_val {
template <typename T, typename U,
typename = std::enable_if_t<same_as_unqualified<type_val, U>>>
friend constexpr auto operator+(T t, U const &) -> T {
return t;
}
friend constexpr auto operator+(type_val const &f) -> type_val { return f; }

template <typename T, typename U,
typename = std::enable_if_t<same_as_unqualified<type_val, U>>>
friend constexpr auto operator*(T, U const &) -> value_marker {
return {};
}
friend constexpr auto operator*(type_val const &f) -> type_val { return f; }

// NOLINTNEXTLINE(google-explicit-constructor)
template <typename T> constexpr operator T() const {
if constexpr (std::is_default_constructible_v<T>) {
Expand All @@ -164,7 +174,7 @@ struct type_val {
};

template <typename> constexpr inline auto is_type = true;
template <> constexpr inline auto is_type<from_any> = false;
template <> constexpr inline auto is_type<value_marker> = false;

class cx_base {
struct unusable {};
Expand Down Expand Up @@ -226,8 +236,8 @@ template <typename T> constexpr auto is_ct_v<T const> = is_ct_v<T>;

#ifndef STDX_IS_TYPE
#define STDX_IS_TYPE(...) \
::stdx::cxv_detail::is_type<__typeof__(::stdx::cxv_detail::from_any( \
__VA_ARGS__))>
::stdx::cxv_detail::is_type<decltype((__VA_ARGS__) * \
::stdx::cxv_detail::type_val{})>
#endif

#ifndef CX_VALUE
Expand Down