macro question

[Martin De Kauwe]

Hi,

so I am translating some c++ code and I don't understand what the
following double hash tag means, I have never seen this before? Any
thoughts would be welcomed.

#define NCRAT(x) x##r= (x > 0.) ? x##n / x : 1e6

ps. I understand the conditional, I just don't get what two hashes
means.

Many thanks,

Martin

 

[Ian Collins]

Hi,

so I am translating some c++ code and I don't understand what the
following double hash tag means, I have never seen this before? Any
thoughts would be welcomed.

#define NCRAT(x) x##r= (x> 0.) ? x##n / x : 1e6

ps. I understand the conditional, I just don't get what two hashes
means.

Concatenation

 

[Hubert Kleinheistermann]

Am 04.02.2011 06:01, schrieb Ian Collins:

Concatenation

Yes, Concatenation.

NCRAT(schnerpel) will be expanded like this:

schnerpelr= (x> 0.) ? schnerpeln / x : 1e6