Re: [Boost-users] Boost.Fusion macro expansion

Subject: Re: [Boost-users] Boost.Fusion macro expansion
From: Robert Jones (robertgbjones_at_[hidden])
Date: 2017-07-31 21:31:22

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_at_[hidden]> 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<std::string, std::string>, futures)
>   (std::map<std::string, std::string>, credit_curves)
>   )
>
> On 30 July 2017 at 17:25, Robert Jones via Boost-users <
> boost-users_at_[hidden]> 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 <boost/fusion/adapted/struct/define_struct.hpp>
>> #include <boost/fusion/include/define_struct.hpp>
>>
>> BOOST_FUSION_DEFINE_STRUCT(
>>   (demo), curves,
>>   ((std::map<std::string, std::string>), futures)
>>   ((std::map<std::string, std::string>), credit_curves)
>>   )
>>
>> int main( )
>> {
>>   return 0;
>> }
>>
>> > make
>> fusion.cpp|9 col 39| error: invalid declarator before ‘)’ token
>>
>> ||    ((std::map<std::string, std::string>), futures)
>>
>>
>> Kind Regards
>>
>> Rob.
>>
>>
>> _______________________________________________
>> Boost-users mailing list
>> Boost-users_at_[hidden]
>> https://lists.boost.org/mailman/listinfo.cgi/boost-users
>>
>
>
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