mirror of
https://github.com/RetroDECK/Duckstation.git
synced 2025-02-17 03:15:39 +00:00
241 lines
9.5 KiB
C++
241 lines
9.5 KiB
C++
#pragma once
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#include "YBaseLib/Common.h"
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#include <cstdint>
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#include <cstring>
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#include <type_traits>
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// Force inline helper
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#ifndef ALWAYS_INLINE
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#if defined(_MSC_VER)
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#define ALWAYS_INLINE __forceinline
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#elif defined(__GNUC__) || defined(__clang__)
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#define ALWAYS_INLINE __attribute__((always_inline)) inline
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#else
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#define ALWAYS_INLINE inline
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#endif
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#endif
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using s8 = int8_t;
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using u8 = uint8_t;
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using s16 = int16_t;
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using u16 = uint16_t;
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using s32 = int32_t;
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using u32 = uint32_t;
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using s64 = int64_t;
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using u64 = uint64_t;
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// Enable use of static_assert in constexpr if
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template<class T>
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struct dependent_false : std::false_type
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{
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};
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template<int T>
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struct dependent_int_false : std::false_type
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{
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};
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// Use a signed number for cycle counting
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using CycleCount = int64_t;
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// Use int64 for time tracking
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using SimulationTime = int64_t;
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// Helpers for simulation time.
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constexpr SimulationTime SecondsToSimulationTime(SimulationTime s)
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{
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return s * INT64_C(1000000000);
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}
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constexpr SimulationTime MillisecondsToSimulationTime(SimulationTime ms)
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{
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return ms * INT64_C(1000000);
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}
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constexpr SimulationTime MicrosecondsToSimulationTime(SimulationTime us)
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{
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return us * INT64_C(1000);
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}
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constexpr SimulationTime SimulationTimeToSeconds(SimulationTime s)
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{
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return s / INT64_C(1000000000);
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}
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constexpr SimulationTime SimulationTimeToMilliseconds(SimulationTime ms)
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{
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return ms / INT64_C(1000000);
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}
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constexpr SimulationTime SimulationTimeToMicroseconds(SimulationTime us)
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{
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return us / INT64_C(1000);
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}
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// Calculates the difference between the specified timestamps, accounting for signed overflow.
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constexpr SimulationTime GetSimulationTimeDifference(SimulationTime prev, SimulationTime now)
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{
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if (prev <= now)
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return now - prev;
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else
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return (std::numeric_limits<SimulationTime>::max() - prev) + now;
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}
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// Zero-extending helper
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template<typename TReturn, typename TValue>
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constexpr TReturn ZeroExtend(TValue value)
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{
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// auto unsigned_val = static_cast<typename std::make_unsigned<TValue>::type>(value);
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// auto extended_val = static_cast<typename std::make_unsigned<TReturn>::type>(unsigned_val);
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// return static_cast<TReturn>(extended_val);
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return static_cast<TReturn>(static_cast<typename std::make_unsigned<TReturn>::type>(
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static_cast<typename std::make_unsigned<TValue>::type>(value)));
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}
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// Sign-extending helper
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template<typename TReturn, typename TValue>
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constexpr TReturn SignExtend(TValue value)
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{
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// auto signed_val = static_cast<typename std::make_signed<TValue>::type>(value);
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// auto extended_val = static_cast<typename std::make_signed<TReturn>::type>(signed_val);
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// return static_cast<TReturn>(extended_val);
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return static_cast<TReturn>(
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static_cast<typename std::make_signed<TReturn>::type>(static_cast<typename std::make_signed<TValue>::type>(value)));
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}
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// Type-specific helpers
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template<typename TValue>
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constexpr u16 ZeroExtend16(TValue value)
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{
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return ZeroExtend<u16, TValue>(value);
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}
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template<typename TValue>
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constexpr u32 ZeroExtend32(TValue value)
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{
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return ZeroExtend<u32, TValue>(value);
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}
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template<typename TValue>
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constexpr u64 ZeroExtend64(TValue value)
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{
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return ZeroExtend<u64, TValue>(value);
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}
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template<typename TValue>
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constexpr u16 SignExtend16(TValue value)
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{
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return SignExtend<u16, TValue>(value);
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}
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template<typename TValue>
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constexpr u32 SignExtend32(TValue value)
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{
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return SignExtend<u32, TValue>(value);
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}
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template<typename TValue>
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constexpr u64 SignExtend64(TValue value)
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{
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return SignExtend<u64, TValue>(value);
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}
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template<typename TValue>
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constexpr u8 Truncate8(TValue value)
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{
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return static_cast<u8>(static_cast<typename std::make_unsigned<decltype(value)>::type>(value));
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}
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template<typename TValue>
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constexpr u16 Truncate16(TValue value)
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{
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return static_cast<u16>(static_cast<typename std::make_unsigned<decltype(value)>::type>(value));
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}
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template<typename TValue>
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constexpr u32 Truncate32(TValue value)
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{
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return static_cast<u32>(static_cast<typename std::make_unsigned<decltype(value)>::type>(value));
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}
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// BCD helpers
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inline u8 DecimalToBCD(u8 value)
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{
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return ((value / 10) << 4) + (value % 10);
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}
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inline u8 BCDToDecimal(u8 value)
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{
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return ((value >> 4) * 10) + (value % 16);
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}
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// Boolean to integer
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constexpr u8 BoolToUInt8(bool value)
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{
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return static_cast<u8>(value);
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}
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constexpr u16 BoolToUInt16(bool value)
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{
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return static_cast<u16>(value);
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}
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constexpr u32 BoolToUInt32(bool value)
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{
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return static_cast<u32>(value);
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}
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constexpr u64 BoolToUInt64(bool value)
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{
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return static_cast<u64>(value);
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}
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// Integer to boolean
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template<typename TValue>
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constexpr bool ConvertToBool(TValue value)
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{
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return static_cast<bool>(value);
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}
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// Unsafe integer to boolean
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template<typename TValue>
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constexpr bool ConvertToBoolUnchecked(TValue value)
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{
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// static_assert(sizeof(uint8) == sizeof(bool));
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bool ret;
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std::memcpy(&ret, &value, sizeof(bool));
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return ret;
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}
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// Generic sign extension
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template<int NBITS, typename T>
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constexpr T SignExtendN(T value)
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{
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// http://graphics.stanford.edu/~seander/bithacks.html#VariableSignExtend
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constexpr int shift = 8 * sizeof(T) - NBITS;
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return static_cast<T>((static_cast<std::make_signed_t<T>>(value) << shift) >> shift);
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}
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// Enum class bitwise operators
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#define IMPLEMENT_ENUM_CLASS_BITWISE_OPERATORS(type_) \
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inline constexpr type_ operator&(type_ lhs, type_ rhs) \
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{ \
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return static_cast<type_>(static_cast<std::underlying_type<type_>::type>(lhs) & \
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static_cast<std::underlying_type<type_>::type>(rhs)); \
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} \
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inline constexpr type_ operator|(type_ lhs, type_ rhs) \
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{ \
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return static_cast<type_>(static_cast<std::underlying_type<type_>::type>(lhs) | \
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static_cast<std::underlying_type<type_>::type>(rhs)); \
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} \
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inline constexpr type_ operator^(type_ lhs, type_ rhs) \
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{ \
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return static_cast<type_>(static_cast<std::underlying_type<type_>::type>(lhs) ^ \
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static_cast<std::underlying_type<type_>::type>(rhs)); \
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} \
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inline constexpr type_ operator~(type_ val) \
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{ \
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return static_cast<type_>(~static_cast<std::underlying_type<type_>::type>(val)); \
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} \
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inline constexpr type_& operator&=(type_& lhs, type_ rhs) \
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{ \
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lhs = static_cast<type_>(static_cast<std::underlying_type<type_>::type>(lhs) & \
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static_cast<std::underlying_type<type_>::type>(rhs)); \
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return lhs; \
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} \
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inline constexpr type_& operator|=(type_& lhs, type_ rhs) \
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{ \
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lhs = static_cast<type_>(static_cast<std::underlying_type<type_>::type>(lhs) | \
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static_cast<std::underlying_type<type_>::type>(rhs)); \
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return lhs; \
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} \
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inline constexpr type_& operator^=(type_& lhs, type_ rhs) \
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{ \
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lhs = static_cast<type_>(static_cast<std::underlying_type<type_>::type>(lhs) ^ \
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static_cast<std::underlying_type<type_>::type>(rhs)); \
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return lhs; \
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}
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