On 14 September 2012 11:29, niXman wrote:

Use BOOST_FUSION_ADAPT_TPL_STRUCT:

http://www.boost.org/doc/libs/1_51_0/libs/fusion/doc/html/fusion/adapted/ada...

That looks to be for adapting a templated struct. I'm just looking to instantiate a templated type in my non-templated struct. (Note: I had actually meant BOOST_FUSION_DEFINE_STRUCT, but it suffers from the same problem.)

--

Nevin ":-)" Liber mailto:nevin@eviloverlord.com (847) 691-1404

On 14 September 2012 12:43, Steven Watanabe wrote:

...

#include

template struct AB {};

BOOST_FUSION_ADAPT_STRUCT( , Silly, (AB<2,3>, ab))

fails

...

How do I work around this?

typedef?

I was hoping for something more scalable. Amongst other things, the real code has a number of boost::array of varying types of sizes, so it is either a lot of typedefs or a lot of wrapper classes to get the number of template arguments down to one. -- Nevin ":-)" Liber mailto:nevin@eviloverlord.com (847) 691-1404

Hi. I think it can be solved by using the BOOST_IDENTITY_TYPE. #include #include template struct AB {}; struct Silly{ AB<2,3> ab; }; BOOST_FUSION_ADAPT_STRUCT( Silly, (BOOST_IDENTITY_TYPE((AB<2,3>)), ab)) ::Silly s; http://ideone.com/WEnJQ BOOST_IDENTITY_TYPE can be used from Boost 1.50.0. http://www.boost.org/doc/libs/release/libs/utility/identity_type/doc/html/in... Thanks.

On 14 September 2012 14:35, Steven Watanabe wrote:

There's this trick: function_traits)>::arg1_type. Unfortunately, this loses CV qualifiers.

That works (and BOOST_IDENTITY_TYPE is just a wrapper around that trick). I'm not worried about the CV qualifiers, as using them on member variables is rare in our code base. Thanks, -- Nevin ":-)" Liber mailto:nevin@eviloverlord.com (847) 691-1404

On 9/19/12 11:49 PM, Joel de Guzman wrote:

On 9/15/12 12:25 AM, Nevin Liber wrote:

...

The following piece of code:

#include

template struct AB {};

BOOST_FUSION_ADAPT_STRUCT( , Silly, (AB<2,3>, ab))

fails with:

main.cpp:8:15: error: macro "BOOST_FUSION_ADAPT_STRUCT" passed 3 arguments, but takes just 2 main.cpp:6:1: error: 'BOOST_FUSION_ADAPT_STRUCT' does not name a type

I am assuming this is because the preprocessor splits line 8 into 'AB<2', '3>', 'ab'.

How do I work around this?

Will:

http://tinyurl.com/96j45k6

help you?

Ah hit send before I could understand more. Please disregard. Regards, -- Joel de Guzman http://www.boostpro.com http://boost-spirit.com