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

Subject: Re: [Boost-users] Boost.Fusion macro expansion
From: Gevorg Voskanyan (gevbsd_at_[hidden])
Date: 2017-08-01 04:08:58

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_at_[hidden]> 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_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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