In such cases you just typedef those comma-containing types and pass the typedef names to macros. HTH, Gevorg On Tue, 1 Aug 2017, 01:31 Robert Jones via Boost-users, < boost-users@lists.boost.org> wrote:

Yeah, that was my first version, which failed, and I figured the problem was the commas in the maps, which would be interpreted as argument separators by the macro processor. As far as I'm aware the usual solution is to parenthesise the comma containing arguments, but in this case that seems to blow up inside Fuion.

On 31 July 2017 at 00:56, Steve Lorimer via Boost-users < boost-users@lists.boost.org> wrote:

...

From looking at the docs, is it because you're wrapping the member type in parens?

BOOST_FUSION_DEFINE_STRUCT( (namespace0)(namespace1)..., struct_name, (member_type0, member_name0) (member_type1, member_name1) ... )

that is, have you tried:

BOOST_FUSION_DEFINE_STRUCT( (demo), curves, (std::map, futures) (std::map, credit_curves) )

On 30 July 2017 at 17:25, Robert Jones via Boost-users < boost-users@lists.boost.org> wrote:

...

Hi Peeps

Can anyone tell me what's wrong with this? I think macro expansion is going awry, but I'm not sure why. Do I really have to typedef the map<...> type to keep Fusion happy?

Thx.

#include<string> #include<map>

#include #include

BOOST_FUSION_DEFINE_STRUCT( (demo), curves, ((std::map), futures) ((std::map), credit_curves) )

int main( ) { return 0; }

...

make fusion.cpp|9 col 39| error: invalid declarator before ‘)’ token

|| ((std::map), futures)

Kind Regards

Rob.

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