Re: [Boost-users] BOOST_PP_SEQ_ENUM troubles

Subject: Re: [Boost-users] BOOST_PP_SEQ_ENUM troubles
From: Cherotek Music (cherotek_at_[hidden])
Date: 2016-07-07 18:05:28

Ah I got it to work with the following:

#define SEQ_FORMATS BOOST_PP_VARIADIC_TO_SEQ(FORMATS)
#define PASTE(l,r) l##r
#define STRINGIZE(x) #x
#define ARG_PAIR(x) {STRINGIZE(x), create<PASTE(x,File)>}
#define NTH_ARG(z, n, data) ARG_PAIR(BOOST_PP_SEQ_ELEM(n, data))
#define ARG_PAIRS BOOST_PP_ENUM(BOOST_PP_SEQ_SIZE(SEQ_FORMATS), NTH_ARG,
SEQ_FORMATS)

Thanks guys!

On Thu, Jul 7, 2016 at 11:57 PM, Cherotek Music <cherotek_at_[hidden]> wrote:

> Thanks for the suggestion but I still can't get it to work :(
>
> #define SEQ_FORMATS BOOST_PP_VARIADIC_TO_SEQ(FORMATS)
> #define ARG_PAIR(x) {#x, create<x##File>}
> #define NTH_ARG(z, n, data) ARG_PAIR(BOOST_PP_SEQ_ELEM(n, data))
> #define ARG_PAIRS BOOST_PP_ENUM(BOOST_PP_SEQ_SIZE(SEQ_FORMATS), NTH_ARG,
> SEQ_FORMATS)
>
> gives the following error:
>
> test.h:14:63: error: pasting ")" and "File" does not give a valid
> preprocessing token
>  #define NTH_ARG(z, n, data) ARG_PAIR(BOOST_PP_SEQ_ELEM(n, data))
>                                                                ^
> test.h:13:33: note: in definition of macro ‘ARG_PAIR’
>  #define ARG_PAIR(x) {#x, create<x##File>}
>
> We're getting closer though
>
> On Thu, Jul 7, 2016 at 6:19 PM, Mathias Gaunard <
> mathias.gaunard_at_[hidden]> wrote:
>
>> On 6 July 2016 at 22:27, Cherotek Music <cherotek_at_[hidden]> wrote:
>>
>>> Hi,
>>> I'm trying to make a macro chain that expands something like this
>>>
>>> *A, B, C*
>>>
>>> into something like this
>>>
>>> *{"A", create<AFile>}, {"B", create<BFile>}, {"C", create<CFile>}*
>>>
>>> This is what I have come up with
>>>
>>> *#define FORMATS A, B, C // Add new formats here*
>>> *#define SEQ_FORMATS BOOST_PP_VARIADIC_TO_SEQ(FORMATS)*
>>> *#define ARG_PAIR(s, data, x) {#x, create<x##File>}*
>>> *#define SEQ_ARG_PAIRS BOOST_PP_SEQ_TRANSFORM(ARG_PAIR, ~, SEQ_FORMATS)*
>>> *#define ARG_PAIRS BOOST_PP_SEQ_ENUM(SEQ_ARG_PAIRS)*
>>>
>>
>> Use BOOST_PP_ENUM with BOOST_PP_SEQ_SIZE and BOOST_PP_SEQ_ELEM instead of
>> BOOST_PP_SEQ_TRANSFORM+BOOST_PP_SEQ_ENUM.
>>
>> _______________________________________________
>> Boost-users mailing list
>> Boost-users_at_[hidden]
>> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>>
>
>