Re: [Boost-users] [Boost.Fusion] Compile-time callbacks.

From: Vjekoslav Brajkovic (balkan_at_[hidden])
Date: 2008-07-29 22:11:07

On Tue, 29 Jul 2008, Stjepan Rajko wrote:

> On Tue, Jul 29, 2008 at 5:34 PM, Vjekoslav Brajkovic
> <balkan_at_[hidden]> wrote:
>>
>> As I have sad before, I'm not particularly familiar with MPL/Fusion, so any
>> clarifications are very welcome. For instance, the document specifies:
>> "It is named "fusion" because the library is reminiscent of the "fusion"
>> of compile time meta-programming with runtime programming.", but it does
>> not specify which part is compile and which is run-time.
>>
>
> The types are compile-time and the values are run-time.  With most
> fusion containers (say, fusion::vector<int,float>), each element has a
> compile time type and a value that can be changed at run-time (this is
> where it differs from MPL).   Maps/pairs are a slight departure from
> the rest in that the first element of a fusion::pair (the key) does
> not have a value associated with it, only the type.
>
Yeah, it makes much more sense now. Thanks for the clarification. =)

-Vjeko