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@ens-lyon.org> wrote:

On 6 July 2016 at 22:27, Cherotek Music <cherotek@gmail.com> 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.

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