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#pragma once
#include "preprocessor.h"
#include <util/generic/strbuf.h>
#include <array>
#include <optional>
#include <type_traits>
#include <vector>
#include <library/cpp/yt/exception/exception.h>
namespace NYT {
////////////////////////////////////////////////////////////////////////////////
/*
* Smart enumerations augment C++ enum classes with a bunch of reflection
* capabilities accessible via TEnumTraits class specialization.
*
* Please refer to the unit test for an actual example of usage
* (unittests/enum_ut.cpp).
*/
// The actual overload must be provided with DEFINE_ENUM* (see below).
template <class T>
void GetEnumTraitsImpl(T);
template <class T, class S>
constexpr bool CanFitSubtype();
template <class T>
using TEnumTraitsImpl = decltype(GetEnumTraitsImpl(T()));
template <class T>
constexpr std::optional<T> TryGetEnumUnknownValueImpl(T);
template <
class T,
bool DomainSizeKnown = requires{ TEnumTraitsImpl<T>::DomainSize; }
>
struct TEnumTraitsWithKnownDomain
{ };
template <
class T,
bool = std::is_enum_v<T> && !std::is_same_v<TEnumTraitsImpl<T>, void>
>
struct TEnumTraits
{
static constexpr bool IsEnum = false;
static constexpr bool IsBitEnum = false;
static constexpr bool IsStringSerializableEnum = false;
static constexpr bool IsMonotonic = false;
};
template <class T>
struct TEnumTraitsWithKnownDomain<T, /*DomainSizeKnown*/ true>
{
static constexpr int GetDomainSize();
static constexpr const std::array<TStringBuf, GetDomainSize()>& GetDomainNames();
static constexpr const std::array<T, GetDomainSize()>& GetDomainValues();
// For non-bit enums only.
static constexpr T GetMinValue()
requires (!TEnumTraitsImpl<T>::IsBitEnum);
static constexpr T GetMaxValue()
requires (!TEnumTraitsImpl<T>::IsBitEnum);
// For bit enums only.
static std::vector<T> Decompose(T value)
requires (TEnumTraitsImpl<T>::IsBitEnum);
};
template <class T>
struct TEnumTraits<T, true>
: public TEnumTraitsWithKnownDomain<T>
{
static constexpr bool IsEnum = true;
static constexpr bool IsBitEnum = TEnumTraitsImpl<T>::IsBitEnum;
static constexpr bool IsStringSerializableEnum = TEnumTraitsImpl<T>::IsStringSerializableEnum;
static constexpr bool IsMonotonic = TEnumTraitsImpl<T>::IsMonotonic;
static TStringBuf GetTypeName();
static constexpr std::optional<T> TryGetUnknownValue();
static std::optional<TStringBuf> FindLiteralByValue(T value);
static std::optional<T> FindValueByLiteral(TStringBuf literal);
static TString ToString(T value);
static T FromString(TStringBuf literal);
};
////////////////////////////////////////////////////////////////////////////////
//! Defines a smart enumeration with a specific underlying type.
/*!
* \param enumType Enumeration type.
* \param seq Enumeration domain encoded as a <em>sequence</em>.
* \param underlyingType Underlying type.
*/
#define DEFINE_ENUM_WITH_UNDERLYING_TYPE(enumType, underlyingType, seq) \
ENUM__CLASS(enumType, underlyingType, seq) \
ENUM__BEGIN_TRAITS(enumType, underlyingType, false, false, seq) \
ENUM__VALIDATE_UNIQUE(enumType) \
ENUM__END_TRAITS(enumType) \
static_assert(true)
//! Defines a smart enumeration with a specific underlying type.
//! Duplicate enumeration values are allowed.
#define DEFINE_AMBIGUOUS_ENUM_WITH_UNDERLYING_TYPE(enumType, underlyingType, seq) \
ENUM__CLASS(enumType, underlyingType, seq) \
ENUM__BEGIN_TRAITS(enumType, underlyingType, false, false, seq) \
ENUM__END_TRAITS(enumType) \
static_assert(true)
//! Defines a smart enumeration with the default |int| underlying type.
#define DEFINE_ENUM(enumType, seq) \
DEFINE_ENUM_WITH_UNDERLYING_TYPE(enumType, int, seq)
//! Defines a smart enumeration with a specific underlying type.
/*!
* \param enumType Enumeration type.
* \param seq Enumeration domain encoded as a <em>sequence</em>.
* \param underlyingType Underlying type.
*/
#define DEFINE_BIT_ENUM_WITH_UNDERLYING_TYPE(enumType, underlyingType, seq) \
ENUM__CLASS(enumType, underlyingType, seq) \
ENUM__BEGIN_TRAITS(enumType, underlyingType, true, false, seq) \
ENUM__VALIDATE_UNIQUE(enumType) \
ENUM__END_TRAITS(enumType) \
ENUM__BITWISE_OPS(enumType) \
static_assert(true)
//! Defines a smart enumeration with a specific underlying type.
//! Duplicate enumeration values are allowed.
/*!
* \param enumType Enumeration type.
* \param seq Enumeration domain encoded as a <em>sequence</em>.
* \param underlyingType Underlying type.
*/
#define DEFINE_AMBIGUOUS_BIT_ENUM_WITH_UNDERLYING_TYPE(enumType, underlyingType, seq) \
ENUM__CLASS(enumType, underlyingType, seq) \
ENUM__BEGIN_TRAITS(enumType, underlyingType, true, false, seq) \
ENUM__END_TRAITS(enumType) \
ENUM__BITWISE_OPS(enumType) \
static_assert(true)
//! Defines a smart enumeration with the default |unsigned int| underlying type.
/*!
* \param enumType Enumeration type.
* \param seq Enumeration domain encoded as a <em>sequence</em>.
*/
#define DEFINE_BIT_ENUM(enumType, seq) \
DEFINE_BIT_ENUM_WITH_UNDERLYING_TYPE(enumType, unsigned int, seq)
//! Defines a smart enumeration with a specific underlying type and IsStringSerializable attribute.
/*!
* \param enumType Enumeration type.
* \param seq Enumeration domain encoded as a <em>sequence</em>.
* \param underlyingType Underlying type.
*/
#define DEFINE_STRING_SERIALIZABLE_ENUM_WITH_UNDERLYING_TYPE(enumType, underlyingType, seq) \
ENUM__CLASS(enumType, underlyingType, seq) \
ENUM__BEGIN_TRAITS(enumType, underlyingType, false, true, seq) \
ENUM__VALIDATE_UNIQUE(enumType) \
ENUM__END_TRAITS(enumType) \
static_assert(true)
//! Defines a smart enumeration with a specific underlying type and IsStringSerializable attribute.
//! Duplicate enumeration values are allowed.
#define DEFINE_AMBIGUOUS_STRING_SERIALIZABLE_ENUM_WITH_UNDERLYING_TYPE(enumType, underlyingType, seq) \
ENUM__CLASS(enumType, underlyingType, seq) \
ENUM__BEGIN_TRAITS(enumType, underlyingType, false, true, seq) \
ENUM__END_TRAITS(enumType) \
static_assert(true)
//! Defines a smart enumeration with the default |int| underlying type and IsStringSerializable attribute.
#define DEFINE_STRING_SERIALIZABLE_ENUM(enumType, seq) \
DEFINE_STRING_SERIALIZABLE_ENUM_WITH_UNDERLYING_TYPE(enumType, int, seq)
//! When enum from another representation (e.g. string or protobuf integer),
//! instructs the parser to treat undeclared values as |unknownValue|.
/*!
* \param enumType Enumeration type.
* \param unknownValue A sentinel value of #enumType.
*/
#define DEFINE_ENUM_UNKNOWN_VALUE(enumType, unknownValue) \
[[maybe_unused]] constexpr std::optional<enumType> TryGetEnumUnknownValueImpl(enumType) \
{ \
return enumType::unknownValue; \
}
////////////////////////////////////////////////////////////////////////////////
//! Returns |true| iff the enumeration value is not bitwise zero.
template <typename E>
requires TEnumTraits<E>::IsBitEnum
constexpr bool Any(E value) noexcept;
//! Returns |true| iff the enumeration value is bitwise zero.
template <typename E>
requires TEnumTraits<E>::IsBitEnum
constexpr bool None(E value) noexcept;
////////////////////////////////////////////////////////////////////////////////
} // namespace NYT
#define ENUM_INL_H_
#include "enum-inl.h"
#undef ENUM_INL_H_
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