Re: [boost] [fusion] Definition for FUSION_MAX_MAP_SIZE

Subject: Re: [boost] [fusion] Definition for FUSION_MAX_MAP_SIZE
From: Agustín K-ballo Bergé (kaballo86_at_[hidden])
Date: 2014-06-30 11:44:29

On 30/06/2014 12:40 p.m., Edward Diener wrote:
> On 6/30/2014 11:15 AM, Agustín K-ballo Bergé wrote:
>> On 30/06/2014 09:26 a.m., Edward Diener wrote:
>>> The documentation for fusion implies that FUSION_MAX_MAP_SIZE is defined
>>> whenever a fusion header is included.
>>
>> It doesn't, it simply reserves the option for any header to define it or
>> include a header that does. This is the general case for max sizes, and
>> allows fusion to do things as implementing a container in terms of a
>> different one.
>>
>>> What fusion header needs to be
>>> included in order to bring in the definition for FUSION_MAX_MAP_SIZE ?
>>
>> As far as I can tell, `FUSION_MAX_MAP_SIZE` is only defined if you
>> include <boost/fusion/container/map.hpp> and the implementation is
>> non-variadic.
>
> What do you mean by 'and the implementation is non-variadic' ?
>

If the compiler has enough C++11 support, you'll get a variadic 
implementation:

     template <typename ...Ts> struct map;

For such implementation, `FUSION_MAX_MAP_SIZE` makes no sense as there 
is no hard limit.

Regards,
-- 
Agustín K-ballo Bergé.-
http://talesofcpp.fusionfenix.com