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#pragma once
#include <type_traits>
#include <util/system/types.h>
#include <util/generic/typetraits.h>
#include <util/generic/fwd.h>
class IOutputStream;
namespace NPrivate {
void PrintFlags(IOutputStream& stream, ui64 value, size_t size);
}
/**
* `TFlags` wrapper provides a type-safe mechanism for storing OR combinations
* of enumeration values.
*
* This class is intended to be used mainly via helper macros. For example:
* @code
* class TAligner {
* public:
* enum EOrientation {
* Vertical = 1,
* Horizontal = 2
* };
* Y_DECLARE_FLAGS(EOrientations, EOrientation)
*
* // ...
* };
*
* Y_DECLARE_OPERATORS_FOR_FLAGS(TAligner::EOrientations)
* @endcode
*/
template <class Enum>
class TFlags {
static_assert(std::is_enum<Enum>::value, "Expecting an enumeration here.");
public:
using TEnum = Enum;
using TInt = std::underlying_type_t<Enum>;
constexpr TFlags(std::nullptr_t = 0)
: Value_(0)
{
}
constexpr TFlags(Enum value)
: Value_(static_cast<TInt>(value))
{
}
/* Generated copy/move ctor/assignment are OK. */
constexpr operator TInt() const {
return Value_;
}
constexpr TInt ToBaseType() const {
return Value_;
}
constexpr static TFlags FromBaseType(TInt value) {
return TFlags(TFlag(value));
}
constexpr friend TFlags operator|(TFlags l, TFlags r) {
return TFlags(TFlag(l.Value_ | r.Value_));
}
constexpr friend TFlags operator|(TEnum l, TFlags r) {
return TFlags(TFlag(static_cast<TInt>(l) | r.Value_));
}
constexpr friend TFlags operator|(TFlags l, TEnum r) {
return TFlags(TFlag(l.Value_ | static_cast<TInt>(r)));
}
constexpr friend TFlags operator^(TFlags l, TFlags r) {
return TFlags(TFlag(l.Value_ ^ r.Value_));
}
constexpr friend TFlags
operator^(TEnum l, TFlags r) {
return TFlags(TFlag(static_cast<TInt>(l) ^ r.Value_));
}
constexpr friend TFlags
operator^(TFlags l, TEnum r) {
return TFlags(TFlag(l.Value_ ^ static_cast<TInt>(r)));
}
constexpr friend TFlags
operator&(TFlags l, TFlags r) {
return TFlags(TFlag(l.Value_ & r.Value_));
}
constexpr friend TFlags operator&(TEnum l, TFlags r) {
return TFlags(TFlag(static_cast<TInt>(l) & r.Value_));
}
constexpr friend TFlags operator&(TFlags l, TEnum r) {
return TFlags(TFlag(l.Value_ & static_cast<TInt>(r)));
}
constexpr friend bool operator==(TFlags l, TFlags r) {
return l.Value_ == r.Value_;
}
constexpr friend bool operator==(TEnum l, TFlags r) {
return static_cast<TInt>(l) == r.Value_;
}
constexpr friend bool operator==(TFlags l, TEnum r) {
return l.Value_ == static_cast<TInt>(r);
}
constexpr friend bool operator!=(TFlags l, TFlags r) {
return l.Value_ != r.Value_;
}
constexpr friend bool operator!=(TEnum l, TFlags r) {
return static_cast<TInt>(l) != r.Value_;
}
constexpr friend bool operator!=(TFlags l, TEnum r) {
return l.Value_ != static_cast<TInt>(r);
}
TFlags& operator&=(TFlags mask) {
*this = *this & mask;
return *this;
}
TFlags& operator&=(Enum mask) {
*this = *this & mask;
return *this;
}
TFlags& operator|=(TFlags flags) {
*this = *this | flags;
return *this;
}
TFlags& operator|=(Enum flags) {
*this = *this | flags;
return *this;
}
TFlags& operator^=(TFlags flags) {
*this = *this ^ flags;
return *this;
}
TFlags& operator^=(Enum flags) {
*this = *this ^ flags;
return *this;
}
constexpr TFlags operator~() const {
return TFlags(TFlag(~Value_));
}
constexpr bool operator!() const {
return !Value_;
}
constexpr explicit operator bool() const {
return Value_;
}
constexpr bool HasFlags(TFlags flags) const {
return (Value_ & flags.Value_) == flags.Value_;
}
TFlags RemoveFlags(TFlags flags) {
Value_ &= ~flags.Value_;
return *this;
}
friend IOutputStream& operator<<(IOutputStream& stream, const TFlags& flags) {
::NPrivate::PrintFlags(stream, static_cast<ui64>(flags.Value_), sizeof(TInt));
return stream;
}
private:
struct TFlag {
constexpr TFlag() {
}
constexpr explicit TFlag(TInt value)
: Value(value)
{
}
TInt Value = 0;
};
constexpr explicit TFlags(TFlag value)
: Value_(value.Value)
{
}
private:
TInt Value_;
};
template <class T>
struct TPodTraits<TFlags<T>> {
enum {
IsPod = TTypeTraits<T>::IsPod
};
};
template <class Enum>
struct THash<TFlags<Enum>> {
size_t operator()(const TFlags<Enum>& flags) const noexcept {
return THash<typename TFlags<Enum>::TInt>()(flags);
}
};
/**
* This macro defines a flags type for the provided enum.
*
* @param FLAGS Name of the flags type to declare.
* @param ENUM Name of the base enum type to use.
*/
#define Y_DECLARE_FLAGS(FLAGS, ENUM) \
using FLAGS = TFlags<ENUM>;
/**
* This macro declares global operator functions for enum base of `FLAGS` type.
* This way operations on individual enum values will provide a type-safe
* `TFlags` object.
*
* @param FLAGS Flags type to declare operator for.
*/
#define Y_DECLARE_OPERATORS_FOR_FLAGS(FLAGS) \
Y_DECLARE_UNUSED \
constexpr inline FLAGS operator|(FLAGS::TEnum l, FLAGS::TEnum r) { \
return FLAGS(l) | r; \
} \
Y_DECLARE_UNUSED \
constexpr inline FLAGS operator~(FLAGS::TEnum value) { \
return ~FLAGS(value); \
}
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