mirror of
https://github.com/aantron/better-enums.git
synced 2025-12-06 08:46:42 +08:00
76ad2256dd
Names containing (and not only beginning with) double underscores are reserved in C++. Resolves #15.
53 lines
1.7 KiB
C++
53 lines
1.7 KiB
C++
// This file is part of Better Enums, released under the BSD 2-clause license.
|
|
// See doc/LICENSE for details, or visit http://github.com/aantron/better-enums.
|
|
|
|
// This file provides an implementation of the enum reflection interface
|
|
// proposed in
|
|
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4428.pdf
|
|
// on top of Better Enums.
|
|
|
|
// See further discussion and a demonstration of usage at
|
|
// example/107-c++17-reflection.cc, or visit:
|
|
// http://aantron.github.io/better-enums/demo/C++17ReflectionProposal.html
|
|
|
|
#pragma once
|
|
|
|
#ifndef BETTER_ENUMS_N4428_H
|
|
#define BETTER_ENUMS_N4428_H
|
|
|
|
|
|
|
|
namespace std {
|
|
|
|
template <typename Enum>
|
|
struct enum_traits {
|
|
struct enumerators {
|
|
constexpr static const size_t size = Enum::_size();
|
|
|
|
template <size_t Index>
|
|
struct get {
|
|
constexpr static Enum value = Enum::_values()[Index];
|
|
constexpr static const char *identifier = Enum::_names()[Index];
|
|
};
|
|
|
|
// The above declarations implement N4428 (except for const char*
|
|
// instead of string_literal). The alternative get below is needed for
|
|
// Better Enums that weren't generated with compile-time name trimming,
|
|
// i.e. without BETTER_ENUMS_CONSTEXPR_TO_STRING declared and not
|
|
// through the SLOW_ENUM macro. That is currently the default for
|
|
// Better Enums, since compile-time name trimming is pretty slow, so you
|
|
// would want to use get_alt instead of get.
|
|
template <size_t Index>
|
|
struct get_alt {
|
|
constexpr static Enum value = Enum::_values()[Index];
|
|
static const char* identifier() { return Enum::_names()[Index]; };
|
|
};
|
|
};
|
|
};
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif // #ifndef BETTER_ENUMS_N4428_H
|