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fix enum_fuse if values out of range

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neargye 2022-02-11 01:14:05 +02:00
parent 63ff515163
commit e7b9231906
1 changed files with 5 additions and 4 deletions
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9
include/magic_enum.hpp
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@ -891,13 +891,14 @@ template <typename E>
template <typename... Es>
[[nodiscard]] constexpr auto enum_fuse(Es... values) -> std::enable_if_t<(std::is_enum_v<std::decay_t<Es>> && ...), std::size_t>{
static_assert(sizeof...(Es) >= 2, "magic_enum::enum_fuse requires at least 2 enums");
#ifdef __cpp_lib_is_constant_evaluated
if (std::is_constant_evaluated() && !(enum_index(values).has_value() && ...)) {
throw std::logic_error("magic_enum::enum_fuse accepts only in-range enum values");
const bool has_values = (enum_index(values).has_value() && ...);
#if defined(__cpp_lib_is_constant_evaluated) && (defined(__cpp_exceptions) || defined(__EXCEPTIONS) || (defined(_HAS_EXCEPTIONS) && _HAS_EXCEPTIONS))
if (std::is_constant_evaluated() && !has_values) {
throw std::logic_error{"magic_enum::enum_fuse accepts only in-range enum values"};
}
#endif
// Add 1 to prevent matching 2D fusions with 3D fusions etc.
return assert((enum_index(values).has_value() && ...)), detail::cantor_pair((enum_index(values).value() + 1)...);
return assert(has_values), (has_values ? detail::cantor_pair((enum_index(values).value() + 1)...) : 0);
}
// Checks whether enum contains enumerator with such enum value.