Variadic template wrapping function call

Question

I need a macro/templated function that will wrap function call of some method on specific object, i.e

a.Destroy()

where a can be of any type as well as Destroy and Destroy may or may not take 0 to n parameters. Inside this wrapper I need to do some checks.

I would like to be able to call this function as a wrapper:

DESTROY_CHECK(a.Destroy(p1,p2,...))

or

DESTROY_CHECK(a, Destroy(p1,p2,...))

How can I achieve this?

Can you post a real usage example? I assume you don't mean to pass a literal ellipsis to the function call? — Kerrek SB, Nov 09 '16 at 14:47

score 0 · Answer 1 · edited Jun 20 '20 at 09:12

0

You can consider variadic macro:

#define identifier( parameters, ... ) replacement-list
... defines a function-like macro with variable number of arguments. The additional arguments can be accessed using __VA_ARGS__ identifier, which is then replaced with arguments, supplied with the identifier to be replaced.

#define DESTROY_CHECK(x, ...) assert(x.Destroy(__VA_ARGS__))

edited Jun 20 '20 at 09:12

Community

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answered Nov 09 '16 at 14:53

AlexD

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Variadic template wrapping function call

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