Question

I want to do something like:

#define TYPE uint32_t
#define ADDSUFFIX(x) xTHETYPE

THETYPE * ADDSUFFIX(getvalue) (THETYPE * pMem) {}

And I need to get uint32_t getvalueuint32_t (uint32_t * pMem) {} depends on what TYPE is.

How to make this work ?

Answer 1

You want the “token pasting” operator, but it can get tricky when one of the operands is a parameter or a macro. This worked for me:

#define THETYPE uint32_t
#define ADDSUFFIX_2(x,y) x ## y
#define ADDSUFFIX_1(x,y) ADDSUFFIX_2(x,y)
#define ADDSUFFIX(x) ADDSUFFIX_1(x,THETYPE)

THETYPE * ADDSUFFIX(getvalue) (THETYPE * pMem) {}

If you want getvalue_uint32_t, this works:

#define ADDSUFFIX(x) ADDSUFFIX_1(x ## _,THETYPE)

Also consider:

#define MKFUNC(type,func,param) \
type * ADDSUFFIX_1(func ## _,type) (type * param)
MKFUNC(uint32_t,getvalue,pMem) { }