Generics Problem

[thepersonof]

Hi I have a generic class: myclass where I put T as either a float or a double. However whenever I compile I get the error: Cannot convert type 'T' to 'float' I know that any of the types I use can be converted to a float. How can I tell the compiler this? thank you

[eggsovereasy]

You didn't give the code so I'm guessing here... Did you do an exlicit cast?

myclass x = new myclass(5.6);

double y = (double)x.value;

If that fails, you could always do something uglier:

float z = x.value;

double y = (double)z;

[Stefan Troschuetz]

Use the where clause to add a constraint to the generic type T, so that it has to implement the IConvertible interface. Afterwards you can use the ToSingle method to convert instances of the generic type T to Single (float) type.

class myclass where T : IConvertible
{
private void Test(T q)
{
float x = q.ToSingle(null);
}
}

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"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook

www.troschuetz.de

[thepersonof]

thank you very much

[thepersonof]

Problem 1... I now have the same problem, but the other way round. How can I convert a float to type T (which is either a float or a double and is iconvertible)? I get the error: Cannot convert type 'float' to 'T' Problem 2... The error: Operator '*' cannot be applied to operands of type 'T' and 'T' when I multiply two numbers What can I do about this? Does float inherit from some class that defines basic mathematical operations? All help is greatly appreciated.. I feel the end is in sight!! thank you