Macro problem

[Null]

Hello, I can't compile this code

#define CATCH_EXCEPTIONS(c)\
try{ \
##c ; \
} \
catch(...){ \
  MessageBox(0,"blah blah","Runtime exception",64); \
}


void fx()
{
    throw 112;
}



int main()
{
  CATCH_EXCEPTIONS(fx());
}

The CATCH_EXCEPTIONS macro should catch exceptions when it is thrown but I get a compiler error:

pasting "{" and "fx" does not give a valid preprocessing token|

How can I fix this?

Thanks for help!

[LB]

Delete the ## on line 4. ## takes a macro argument on the left and right, and it smushes them together with no spaces in-between. http://www.cplusplus.com/doc/tutorial/preprocessor/

#define CATCH_EXCEPTIONS(c)\
try{\
	c;\
}\
catch(...){\
	MessageBox(0,"blah blah","Runtime exception",MB_OK);\
} 

[Null]

Oh, such a stupid mistake!

Thanks!

[jsmith]

Not a great use of macros, I must say.

For one thing, macros should not be used to invent new grammar, which is sort of what you're doing.

And secondly, if you have try-catch blocks littered throughout your code (which prompted creating
the shorthand in the first place) then you are probably misusing exceptions.