Re: [Boost-users] BOOST_PP_REPEAT to repeat comma-containing text

Subject: Re: [Boost-users] BOOST_PP_REPEAT to repeat comma-containing text
From: Igor R (boost.lists_at_[hidden])
Date: 2014-04-08 08:55:30

> I'm trying to repeat a group of actual parameters (passed to some 3d
> party plain-C "variadic" function).
> The function call looks like this:
>
> func(count,
>   param1, param2, arr1[0], arr2[0],
>   param1, param2, arr1[1], arr2[1],
>   param1, param2, arr1[2], arr2[2] /* etc */);
>
> So essentially, I'd like to repeat (param1, param2, arr1[n], arr2[n]) group.
> What is the right way to invoke BOOST_PP_REPEAT in this case?

Just realized that commas do not affect anything here, so the
straghtforward BOOST_PP_REPEAT invocation does the job:

#define EXPR(z, x, text) BOOST_PP_COMMA_IF(x) param1, param2, arr1[x], arr2[x]
#define REPEAT_PARAMS(x) BOOST_PP_REPEAT(x, EXPR, _)

func(count, REPEAT_PARAMS(5));

Sorry for the noise.