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more customizing range

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neargye 2019-04-09 14:35:21 +05:00
parent bc99650db9
commit 0d4dad3ab3
1 changed files with 27 additions and 3 deletions
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30
include/magic_enum.hpp
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@ -41,16 +41,40 @@
#include <type_traits>
#include <utility>
// Enum value must be less than MAGIC_ENUM_RANGE_MAX. By default MAGIC_ENUM_RANGE_MAX = 128.
// If need another max range for all enum types by default, redefine the macro MAGIC_ENUM_RANGE_MAX.
#if !defined(MAGIC_ENUM_RANGE_MAX)
# define MAGIC_ENUM_RANGE_MAX 128
#endif
// Enum value must be greater than MAGIC_ENUM_RANGE_MIN. By default MAGIC_ENUM_RANGE_MIN = -128.
// If need another min range for all enum types by default, redefine the macro MAGIC_ENUM_RANGE_MIN.
#if !defined(MAGIC_ENUM_RANGE_MIN)
# define MAGIC_ENUM_RANGE_MIN -128
#endif
namespace magic_enum {
// Enum value must be in range [-256, 256]. If you need another range, add specialization enum_range for necessary enum type.
// Enum value must be in range [-MAGIC_ENUM_RANGE_MAX, MAGIC_ENUM_RANGE_MIN]. By default MAGIC_ENUM_RANGE_MAX = 128, MAGIC_ENUM_RANGE_MIN = -128.
// If need another range for all enum types by default, redefine the macro MAGIC_ENUM_RANGE_MAX and MAGIC_ENUM_RANGE_MIN.
// If need another range for specific enum type, add specialization enum_range for necessary enum type.
template <typename E>
struct enum_range final {
static_assert(std::is_enum_v<E>, "magic_enum::enum_range requires enum type.");
static constexpr int min = std::is_signed_v<std::underlying_type_t<E>> ? -256 : 0;
static constexpr int max = 256;
static constexpr int min = std::is_signed_v<std::underlying_type_t<E>> ? MAGIC_ENUM_RANGE_MIN : 0;
static constexpr int max = MAGIC_ENUM_RANGE_MAX;
};
static_assert(MAGIC_ENUM_RANGE_MAX > 0,
"MAGIC_ENUM_RANGE_MAX must be greater than 0.");
static_assert(MAGIC_ENUM_RANGE_MAX < std::numeric_limits<int>::max(),
"MAGIC_ENUM_RANGE_MAX must be less than INT_MAX.");
static_assert(MAGIC_ENUM_RANGE_MIN <= 0,
"MAGIC_ENUM_RANGE_MIN must be less or equals than 0.");
static_assert(MAGIC_ENUM_RANGE_MIN > std::numeric_limits<int>::min(),
"MAGIC_ENUM_RANGE_MIN must be greater than INT_MIN.");
namespace detail {
template <typename E, typename U = std::underlying_type_t<E>>