Chief Delphi - Overloaded functions

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jgannon

30-12-2004 19:03

Overloaded functions

In my header file, I have the following function prototypes:

Code:

int abs(int);

float abs(float);

In my source file, I have the following functions:

Code:

int abs(int x)

{

  if(x>=0)

    return x;

  else

    return -x;

}



float abs(float x)

{

  if(x>=0)

    return x;

  else

    return -x;

}

I also have a whole bunch of other overloaded functions. (I know this isn't the best example, but it's short.) However, when I compile it, I get a lot of "type mismatch in redeclaration of 'abs'" and "redefinition of 'abs'" errors. Does the C18 compiler not support overloading, or am I doing something wrong that I'm overlooking?

Max Lobovsky

30-12-2004 19:05

Re: Overloaded functions

If I'm not mistaken, overloadable functions was added in C++ and is not possible in C.

jgannon

30-12-2004 19:08

Re: Overloaded functions

Quote:

Originally Posted by Max Lobovsky

If I'm not mistaken, overloadable functions was added in C++ and is not possible in C.

Hm... that's unfortunate. Is there any way to get the equivalent of overloading, without making two separately named functions? I guess this is what happens when a TI-BASIC/C++/Java programmer tries to do C. :)

Max Lobovsky

30-12-2004 19:18

Re: Overloaded functions

Well for this example, you could easily just cast to int and use the same function. (You could cast to int in all cases, even when it already is an int, to maintain uniformity). I can't really think of any other way.

Mike Betts

30-12-2004 22:51

Re: Overloaded functions

IMHO, no one would ever want to work with floating point at all in an embedded system like this. It makes no sense.

JMHO...

Astronouth7303

31-12-2004 11:04

Re: Overloaded functions

The only thing I can think of is to use a macro

Code:

#define ABS(num) ( ((num) >= 0) ? (num) : (0 - (num)) )

which will work for any numeric type you give it.

But I still wouldn't use floating point.

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