Using a macro to construct a function

Question

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Macro for concatenating two strings in C

I have a function that looks something like this:

bool module_foo_process(void* bar) { return doMagic(bar); }

Now, I'd like to generate it with a macro. For instance, the macro for the above function would look like this:

MY_AMAZING_MACRO(foo)

This allows me to write something like:

MY_AMAZING_MACRO(awesome)

and get this:

bool module_awesome_process(void* bar) { return doMagic(bar); }

Any ideas on how this can be accomplished in C?

You might like to read here: http://gcc.gnu.org/onlinedocs/cpp/Stringification.html — alk, Nov 04 '12 at 18:35

score 5 · Accepted Answer · answered Nov 04 '12 at 18:35

5

#define MY_AMAZING_MACRO(name) \
  bool module_##name##_process(void* bar) { return doMagic(bar); }

answered Nov 04 '12 at 18:35

Vaughn Cato

score 4 · Answer 2 · answered Nov 04 '12 at 18:35

4

Use the concatenation operator ##:

#define MY_AMAZING_MACRO(foo) bool module_##foo##_process(void* bar) { return doMagic(bar); }

See the gcc online documentation for more details: Concatenation.

answered Nov 04 '12 at 18:35

DrummerB

2 Answers2