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better_enum::optional: add conversion operator to std::optional

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This commit is contained in:
jaskij 2024-02-10 17:49:05 +01:00
parent 520d8ee390
commit 330935c1d6
1 changed files with 11 additions and 0 deletions
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11
enum.h
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@ -14,6 +14,10 @@
#include <iosfwd> #include <iosfwd>
#include <stdexcept> #include <stdexcept>
#if __cplusplus >= 201703L
#include <optional>
#endif
// in-line, non-#pragma warning handling // in-line, non-#pragma warning handling
// not supported in very old compilers (namely gcc 4.4 or less) // not supported in very old compilers (namely gcc 4.4 or less)
@ -344,6 +348,13 @@ struct optional {
BETTER_ENUMS_CONSTEXPR_ const T& value() const { return _value; } BETTER_ENUMS_CONSTEXPR_ const T& value() const { return _value; }
#if defined(__cpp_lib_optional) && (__cpp_lib_optional >= 201606L)
BETTER_ENUMS_CONSTEXPR_ operator std::optional<T>() const {
if(has_value()) {return {_value};}
return std::nullopt;
}
#endif
private: private:
bool _valid; bool _valid;
T _value; T _value;