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fix: const enum signature_of ambiguity error (#444)

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This fixes the template specialization ambiguity error when a signature_of applied upon a const (and/or volatile) enum type would render the const specialization and the enum specialization as two equally-ranked candidates.
This commit is contained in:
Stanislav Angelovič
2024-05-15 15:46:24 +02:00
committed by GitHub
parent e6b87b106c
commit c6705faf2f
3 changed files with 22 additions and 5 deletions
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include/sdbus-c++/TypeTraits.h
+7 -3
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@@ -140,6 +140,10 @@ namespace sdbus {
struct signature_of<volatile _T> : signature_of<_T>
{};
template <typename _T>
struct signature_of<const volatile _T> : signature_of<_T>
{};
template <typename _T>
struct signature_of<_T&> : signature_of<_T>
{};
@@ -337,9 +341,9 @@ namespace sdbus {
};
#endif
template <typename _Enum>
struct signature_of<_Enum, typename std::enable_if_t<std::is_enum_v<_Enum>>>
: public signature_of<std::underlying_type_t<_Enum>>
template <typename _Enum> // is_const_v and is_volatile_v to avoid ambiguity conflicts with const and volatile specializations of signature_of
struct signature_of<_Enum, typename std::enable_if_t<std::is_enum_v<_Enum> && !std::is_const_v<_Enum> && !std::is_volatile_v<_Enum>>>
: signature_of<std::underlying_type_t<_Enum>>
{};
template <typename _Key, typename _Value, typename _Compare, typename _Allocator>