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better_enum::optional: add conversion operator to std::optional #122

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better_enum::optional: add conversion operator to std::optional #122

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11 changes: 11 additions & 0 deletions enum.h
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,10 @@
#include <iosfwd>
#include <stdexcept>

#if __cplusplus >= 201703L
#include <optional>
#endif


// in-line, non-#pragma warning handling
// not supported in very old compilers (namely gcc 4.4 or less)
Expand Down Expand Up @@ -344,6 +348,13 @@ struct optional {

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:
bool _valid;
T _value;
Expand Down