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)

The SEQ_ARG_PAIRS macro does expand into

({"A", create<AFile>}) ({"B", create<BFile>}) ({"C", create<CFile>})

but ARG_PAIRS fails with the following error:

test.cpp:20:1: error: macro "BOOST_PP_SEQ_SIZE_0" passed 2 arguments, but takes just 1

ARG_PAIRS

BOOST_PP_SEQ_ENUM_0 ({"B", create<BFile>}) ({"C", create<CFile>}) ({"A", create<AFile>}) ({"B", create<BFile>}) ({"C", create<CFile>})

Any ideas?

thanks a lot