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Home » Tip Bank » C++
Language: C++
Expertise: Intermediate
Jul 2, 2001

The ## Concatenation Operator


The preprocessor ## operator concatenates macro arguments. For example:
 
#define paste(x,y) x ## y

The paste() macro takes two arguments and concatenates them into one. The whitespaces surrounding the ## operator as well as the ## symbol are removed in the concatenation process. In the following example, the paste() function-like macro concatenates the literal 1000 and the affix L thereby creating the constant 1000L.
#define paste(x,y) x ## y #define LONG_MAX paste(1000,L) // LONG_MAX equals 1000L
Danny Kalev
 
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