static bool _IsNumericType(CodeTypeReference t)
{
return(CTE.Equals(_Byte, t) || CTE.Equals(_SByte, t) ||
CTE.Equals(_Short, t) || CTE.Equals(_UShort, t) ||
CTE.Equals(_Int, t) || CTE.Equals(_UInt, t) ||
CTE.Equals(_Long, t) || CTE.Equals(_Ulong, t) ||
CTE.Equals(_FloatType, t) || CTE.Equals(_DoubleType, t) ||
CTE.Equals(_DecimalType, t));
}
static CodeTypeReference _PromoteType(CodeTypeReference x, CodeTypeReference y)
{
if ((_IsNumericType(x) || CTE.Equals(_Char, x)) && (_IsNumericType(y) || CTE.Equals(_Char, y)))
{
//If either operand is of type decimal, the other operand is converted to type decimal, or a compile-time error occurs if the other operand is of type float or double.
if (CTE.Equals(x, _DecimalType))
{
if (CTE.Equals(_FloatType, y))
{
throw new InvalidOperationException("Cannot convert float to decimal");
}
if (CTE.Equals(_DoubleType, y))
{
throw new InvalidOperationException("Cannot convert double to decimal");
}
return(new CodeTypeReference(typeof(decimal)));
}
else if (CTE.Equals(y, _DecimalType))
{
if (CTE.Equals(_FloatType, x))
{
throw new InvalidOperationException("Cannot convert float to decimal");
}
if (CTE.Equals(_DoubleType, x))
{
throw new InvalidOperationException("Cannot convert double to decimal");
}
return(new CodeTypeReference(typeof(decimal)));
}
//Otherwise, if either operand is of type double, the other operand is converted to type double.
if (CTE.Equals(x, _DoubleType) || CTE.Equals(y, _DoubleType))
{
return(new CodeTypeReference(typeof(double)));
}
//Otherwise, if either operand is of type float, the other operand is converted to type float.
if (CTE.Equals(x, _FloatType) || CTE.Equals(y, _FloatType))
{
return(new CodeTypeReference(typeof(double)));
}
//Otherwise, if either operand is of type ulong, the other operand is converted to type ulong,
// or a compile-time error occurs if the other operand is of type sbyte, short, int, or long.
if (CTE.Equals(x, _Ulong))
{
if (CTE.Equals(_SByte, y) ||
CTE.Equals(_Short, y) ||
CTE.Equals(_Int, y) ||
CTE.Equals(_Long, y))
{
throw new InvalidOperationException("Cannot convert signed type to ulong");
}
return(new CodeTypeReference(typeof(ulong)));
}
else if (CTE.Equals(y, _Ulong))
{
if (CTE.Equals(_SByte, x) ||
CTE.Equals(_Short, x) ||
CTE.Equals(_Int, x) ||
CTE.Equals(_Long, x))
{
throw new InvalidOperationException("Cannot convert signed type to ulong");
}
return(new CodeTypeReference(typeof(ulong)));
}
//Otherwise, if either operand is of type long, the other operand is converted to type long.
if (CTE.Equals(x, _Long) || CTE.Equals(y, _Long))
{
return(new CodeTypeReference(typeof(long)));
}
//Otherwise, if either operand is of type uint and the other operand is of type sbyte, short, or int, both operands are converted to type long.
if (CTE.Equals(x, _UInt))
{
if (CTE.Equals(_SByte, y) ||
CTE.Equals(_Short, y) ||
CTE.Equals(_Int, y))
{
return(new CodeTypeReference(typeof(long)));
}
}
else if (CTE.Equals(y, _UInt))
{
if (CTE.Equals(_SByte, x) ||
CTE.Equals(_Short, x) ||
CTE.Equals(_Int, x))
{
return(new CodeTypeReference(typeof(long)));
}
}
//Otherwise, if either operand is of type uint, the other operand is converted to type uint.
if (CTE.Equals(x, _UInt) || CTE.Equals(y, _UInt))
{
return(new CodeTypeReference(typeof(uint)));
}
//Otherwise, both operands are converted to type int.
return(new CodeTypeReference(typeof(int)));
}
if (CTE.Equals(x, y))
{
return(x);
}
throw new InvalidCastException("Cannot promote these types");
}