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raze/source/common/utility/tflags.h

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/*
** tflags.h
**
**---------------------------------------------------------------------------
** Copyright 2015 Teemu Piippo
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
#pragma once
/*
* TFlags
*
* A Qt-inspired type-safe flagset type.
*
* T is the enum type of individual flags,
* TT is the underlying integer type used (defaults to uint32_t)
*/
template<typename T, typename TT = uint32_t>
class TFlags
{
struct ZeroDummy {};
public:
typedef TFlags<T, TT> Self;
typedef T EnumType;
typedef TT IntType;
TFlags() = default;
TFlags(const Self& other) = default;
TFlags (T value) : Value (static_cast<TT> (value)) {}
// This allows initializing the flagset with 0, as 0 implicitly converts into a null pointer.
TFlags (ZeroDummy*) : Value (0) {}
// Relation operators
Self operator| (Self other) const { return Self::FromInt (Value | other.GetValue()); }
Self operator& (Self other) const { return Self::FromInt (Value & other.GetValue()); }
Self operator^ (Self other) const { return Self::FromInt (Value ^ other.GetValue()); }
Self operator| (T value) const { return Self::FromInt (Value | value); }
Self operator& (T value) const { return Self::FromInt (Value & value); }
Self operator^ (T value) const { return Self::FromInt (Value ^ value); }
Self operator~() const { return Self::FromInt (~Value); }
// Assignment operators
Self& operator= (Self other) { Value = other.GetValue(); return *this; }
Self& operator|= (Self other) { Value |= other.GetValue(); return *this; }
Self& operator&= (Self other) { Value &= other.GetValue(); return *this; }
Self& operator^= (Self other) { Value ^= other.GetValue(); return *this; }
Self& operator= (T value) { Value = value; return *this; }
Self& operator|= (T value) { Value |= value; return *this; }
Self& operator&= (T value) { Value &= value; return *this; }
Self& operator^= (T value) { Value ^= value; return *this; }
// Access the value of the flagset
TT GetValue() const { return Value; }
operator TT() const { return Value; }
// Set the value of the flagset manually with an integer.
// Please think twice before using this.
static Self FromInt (TT value) { return Self (static_cast<T> (value)); }
private:
template<typename X> Self operator| (X value) const { return Self::FromInt (Value | value); }
template<typename X> Self operator& (X value) const { return Self::FromInt (Value & value); }
template<typename X> Self operator^ (X value) const { return Self::FromInt (Value ^ value); }
public: // to be removed.
TT Value;
};
/*
* Additional operators for TFlags types.
*/
#define DEFINE_TFLAGS_OPERATORS(T) \
inline T operator| (T::EnumType a, T::EnumType b) { return T::FromInt (T::IntType (a) | T::IntType (b)); } \
inline T operator& (T::EnumType a, T::EnumType b) { return T::FromInt (T::IntType (a) & T::IntType (b)); } \
inline T operator^ (T::EnumType a, T::EnumType b) { return T::FromInt (T::IntType (a) ^ T::IntType (b)); } \
inline T operator| (T::EnumType a, T b) { return T::FromInt (T::IntType (a) | T::IntType (b)); } \
inline T operator& (T::EnumType a, T b) { return T::FromInt (T::IntType (a) & T::IntType (b)); } \
inline T operator^ (T::EnumType a, T b) { return T::FromInt (T::IntType (a) ^ T::IntType (b)); } \
inline T operator~ (T::EnumType a) { return T::FromInt (~T::IntType (a)); }