Re: [Boost-users] BOOST_PP_SEQ_ENUM troubles

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} #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 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} #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}

We're getting closer though

On Thu, Jul 7, 2016 at 6:19 PM, Mathias Gaunard < mathias.gaunard@ens-lyon.org> wrote:

...

On 6 July 2016 at 22:27, Cherotek Music 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}* *#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.

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