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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef BITWISEENUM_H
#define BITWISEENUM_H
/**
* This template is loosely based on MiLi's bitwise_enums.h written by Daniel Gutson (FuDePAN).
* Their implementation is licensed under GPLv3, so we had to rewrite it. Still all kudos should go to them.
*
* URL of the MiLi project: http://code.google.com/p/mili/
**/
/**
* @brief BitwiseEnum<class Enum>
*
* example usage:
* enum Colors {red, green, blue};
* typedef BitwiseEnum<Colors> Color;
* enum Vehicles {car, bus, train};
* void foo(Color c);
* Color c = Colors::red | Colors::green;
*
* foo(c); // valid
* foo(Colors::red); // valid
* foo(Colors::red | Colors::green); // valid
* foo(Vehicles::car); // not valid
* foo(1); // not valid
**/
template <class Enum>
class BitwiseEnum
{
private:
int v;
public:
BitwiseEnum(const Enum& _v) : v(_v) {}
BitwiseEnum() : v(0) {}
//! fixes http://code.google.com/p/mili/issues/detail?id=40
operator int() const { return v; }
// We use c++ default ones
/*BitwiseEnum<Enum>& operator = (const Enum& v2)
{
return v = v2;
}
BitwiseEnum<Enum>& operator = (const BitwiseEnum<Enum>& be2)
{
return v = be2.v;
}*/
//===================================
// BitwiseEnum<Enum> operators
// Compound assignment operators
BitwiseEnum<Enum>& operator |= (const BitwiseEnum<Enum>& be2)
{
v |= be2.v;
return *this;
}
BitwiseEnum<Enum>& operator &= (const BitwiseEnum<Enum>& be2)
{
v &= be2.v;
return *this;
}
BitwiseEnum<Enum>& operator ^= (const BitwiseEnum<Enum>& be2)
{
v ^= be2.v;
return *this;
}
// Bitwise operators
BitwiseEnum<Enum> operator | (const BitwiseEnum<Enum>& be2) const
{
BitwiseEnum<Enum> be(*this);
be.v |= be2.v;
return be;
}
BitwiseEnum<Enum> operator & (const BitwiseEnum<Enum>& be2) const
{
BitwiseEnum<Enum> be(*this);
be.v &= be2.v;
return be;
}
BitwiseEnum<Enum> operator ^ (const BitwiseEnum<Enum>& be2) const
{
BitwiseEnum<Enum> be(*this);
be.v ^= be2.v;
return be;
}
// Comparison operators
bool operator == (const BitwiseEnum<Enum>& be2) const
{
return v == be2.v;
}
bool operator != (const BitwiseEnum<Enum>& be2) const
{
return v != be2.v;
}
//===================================
// Enum operators
// Compound assignment operators
BitwiseEnum<Enum>& operator |= (const Enum& v2)
{
v |= v2;
return *this;
}
BitwiseEnum<Enum>& operator &= (const Enum& v2)
{
v &= v2;
return *this;
}
BitwiseEnum<Enum>& operator ^= (const Enum& v2)
{
v ^= v2;
return *this;
}
// Bitwise operators
BitwiseEnum<Enum> operator | (const Enum& v) const
{
BitwiseEnum<Enum> be(*this);
be.v |= v;
return be;
}
BitwiseEnum<Enum> operator & (const Enum& v) const
{
BitwiseEnum<Enum> be(*this);
be.v &= v;
return be;
}
BitwiseEnum<Enum> operator ^ (const Enum& v) const
{
BitwiseEnum<Enum> be(*this);
be.v ^= v;
return be;
}
// Comparison operators
bool operator == (const Enum& v2) const
{
return v == v2;
}
bool operator != (const Enum& v2) const
{
return v != v2;
}
};
template <class Enum>
inline BitwiseEnum<Enum> operator | (Enum a, Enum b)
{
return BitwiseEnum<Enum>(a) | BitwiseEnum<Enum>(b);
}
/* WE DO NOT NEED THESE (I ASSUME)
template <class Enum>
inline BitwiseEnum<Enum> operator & (Enum a, Enum b)
{
return BitwiseEnum<Enum>(a) | BitwiseEnum<Enum>(b);
}
template <class Enum>
inline BitwiseEnum<Enum> operator ^ (Enum a, Enum b)
{
return BitwiseEnum<Enum>(a) | BitwiseEnum<Enum>(b);
}
*/
#endif // BITWISEENUM_H
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