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