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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef UPCAST_H
#define UPCAST_H
namespace upcast {
template<class T> struct UnaryUpcast {};
template<class U, class V> struct BinaryUpcast {};
/* Get rid of const modifier */
template<class T> struct UnaryUpcast<const T> { typedef typename UnaryUpcast<T>::type type; };
/* To reduce size of the BinaryUpcast matrix, UnaryUpcast small types
to (unsigned) int before attempting to BinaryUpcast them. */
template<> struct UnaryUpcast< bool > { typedef signed int type; };
template<> struct UnaryUpcast< signed char > { typedef signed int type; };
template<> struct UnaryUpcast< signed short > { typedef signed int type; };
template<> struct UnaryUpcast< signed int > { typedef signed int type; };
template<> struct UnaryUpcast< signed long > { typedef signed long type; };
template<> struct UnaryUpcast< unsigned char > { typedef signed int type; };
template<> struct UnaryUpcast< unsigned short > { typedef signed int type; };
template<> struct UnaryUpcast< unsigned int > { typedef unsigned int type; };
template<> struct UnaryUpcast< unsigned long > { typedef unsigned long type; };
template<> struct UnaryUpcast< float > { typedef float type; };
template<> struct UnaryUpcast< double > { typedef double type; };
template<> struct UnaryUpcast< long double > { typedef long double type; };
#define UPCAST1(U, V, W) \
template<> struct BinaryUpcast<U,V> { typedef W type; }
#define UPCAST2(U, V, W) \
template<> struct BinaryUpcast<U,V> { typedef W type; }; \
template<> struct BinaryUpcast<V,U> { typedef W type; }
/* Note: this was checked using GCC 4 on AMD64 */
/* param1 + param2 --> return type */
UPCAST1( signed int , signed int , signed int );
UPCAST2( signed int , signed long , signed int );
UPCAST2( signed int , unsigned int , unsigned int );
UPCAST2( signed int , unsigned long , unsigned long );
UPCAST2( signed int , float , float );
UPCAST2( signed int , double , double );
UPCAST2( signed int , long double , long double );
UPCAST1( signed long , signed long , signed long );
UPCAST2( signed long , unsigned int , signed long );
UPCAST2( signed long , unsigned long , unsigned long );
UPCAST2( signed long , float , float );
UPCAST2( signed long , double , double );
UPCAST2( signed long , long double , long double );
UPCAST1( unsigned int , unsigned int , unsigned int );
UPCAST2( unsigned int , unsigned long , unsigned long );
UPCAST2( unsigned int , float , float );
UPCAST2( unsigned int , double , double );
UPCAST2( unsigned int , long double , long double );
UPCAST1( unsigned long , unsigned long , unsigned long );
UPCAST2( unsigned long , float , float );
UPCAST2( unsigned long , double , double );
UPCAST2( unsigned long , long double , long double );
UPCAST1( float , float , float );
UPCAST2( float , double , double );
UPCAST2( float , long double , long double );
UPCAST1( double , double , double );
UPCAST2( double , long double , long double );
UPCAST1( long double , long double , long double );
#undef UPCAST1
#undef UPCAST2
template<class U, class V> struct Upcast {
typedef typename BinaryUpcast<typename UnaryUpcast<U>::type, typename UnaryUpcast<V>::type>::type type;
};
#define UPCAST(U, V) \
typename upcast::Upcast< U, V >::type
}
#endif // UPCAST_H
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