Re: [boost] [serialization] boost::tuple

From: troy d. straszheim (troy_at_[hidden])
Date: 2005-09-24 03:47:01

Manfred Doudar wrote:
> troy d. straszheim wrote:
> 
> 
>>>jarvi wrote:
>>>The implementation relies on the cons-list implementation of tuples.
>>>It is part of the public interface of Boost.Tuple, but not part of 
>>>the TR1 specification. So if one wants to define serialization so 
>>>that it works with any TR1 compatible tuple implementation, one must 
>>>build the metafunctions around the get<N> templates. The downside of 
>>>this is, that more compiler resources will be used.
>>>   
>>>
>>
>>So the tuple at boost/tuple/tuple.hpp doesn't have tuple_size<>.  One is
>>forced to resort to using either the cons<> stuff, or lots of
>>preprocessor stuff.  I went with cons.
>> 
>>
> 
> 
> Am I missing something here?  I know that boost::tuple lacks a _size<>
> but I've always found a simple work-around with:
> 
> template <typename T>
> size_t tuple_size(T tuple)
> {
>     return boost::tuples::length<T>::value ;
> }
> 
> ... But I agree, that convenience is lacking.
> 

Ah, thank you, I somehow missed that.   So no, one isn't *forced* to 
depend on the cons<> interface, but somehow I ended up there on the 
first go.  Maybe somebody wants to add this to boost::tuples, then that 
serialization routine should work with either.

-t