How to define function type with typedef?

Question

I would like to know if it is possible to define a function type using typedef, I tried this syntax:

typedef int (*) (void *, void *) order;

But it doesn't work. Error message : expected identifier or '(' before ')' token

Answer 1

The alias name should be placed where a variable name would be if it was a variable declaration.

Here:

typedef int (*order) (void *, void *);
//            ^~~~~

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Or, if you want a function type rather than a pointer-to-function:

typedef int order(void *, void *);