Re: [Boost-users] [fusion] making an inner struct boost fusion compatible?

Subject: Re: [Boost-users] [fusion] making an inner struct boost fusion compatible?
From: Oswin Krause (Oswin.Krause_at_[hidden])
Date: 2012-09-21 02:35:18

HI,

thanks for the reply.
Is it possible to just copy and rename the macro, or does it depend on 
newer features of fusion? I need to be compatible with boost 1.45 so i 
can't use it directly (also i need to add a few more functions to the 
structure later on)

Greetings,
Oswin

On 2012-09-20 21:53, Nathan Ridge wrote:
>> Hi list,
>>
>> I have the following problem:
>>
>> template<class T, class U, class V>
>> struct MyType{
>> struct nested{
>> typename MetaFunc<T>::type a;
>> typename MetaFunc<U>::type b;
>> typename MetaFunc<V>::type c;
>> };
>> };
>>
>> now this inner struct must be a boost fusion compatible random 
>> access
>> sequence. The examples cover only structs on namespace lvel, how can 
>> i
>> handle this way? Later these classes will be generated by a macro
>> automatically so even dirty hacks are allowed :). But i don't want 
>> to
>> clatter the namespace by pulling nested outside of the class.
>>
>> Is there an easy way or do i have to write the necessary 
>> mtafunctions
>> to make this possible?
>
> You should be able to use BOOST_FUSION_DEFINE_STRUCT_INLINE [1]
> as follows:
>
> template<class T, class U, class V>
> struct MyType{
> Â Â Â  BOOST_FUSION_DEFINE_STRUCT_INLINE(
> Â Â Â Â Â Â Â  nested,
> Â Â Â Â Â Â Â  (typename MetaFunc<T>::type, a)
> Â Â Â Â Â Â Â  (typename MetaFunc<U>::type, b)
> Â Â Â Â Â Â Â  (typename MetaFunc<V>::type, c)
> Â Â Â  )
> };
>
> Note however that BOOST_FUSION_DEFINE_STRUCT_INLINE is new in Boost 
> 1.51.
>
> Regards,
> Nate
>
> [1]
> 
> http://www.boost.org/doc/libs/1_51_0/libs/fusion/doc/html/fusion/adapted/define_struct_inline.html
>
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