[Boost-users] BOOST_PP_SEQ_ENUM troubles

Subject: [Boost-users] BOOST_PP_SEQ_ENUM troubles
From: Cherotek Music (cherotek_at_[hidden])
Date: 2016-07-06 17:27:42

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