Re: [boost] compressed_pair initialization

From: Peter Dimov (pdimov_at_[hidden])
Date: 2006-05-18 17:39:07

Howard Hinnant wrote:
> On May 18, 2006, at 5:14 PM, Matt Calabrese wrote:
> 
>> SFINAE would not come into play with just overloaded constructors,
>> regardless of the fact that they are constructors of a template
>> instantiation. The constructors would have to be templates
>> themselves. Correct me if I'm missing something, but would it not be
>> better to just have
>> a compressed_tuple template, or are there reasons I am missing?
> 
> Actually you don't even need a new type compressed_tuple.  You could
> put this functionality straight into tuple.  It'd be a royal pain to
> do for tuple sizes greater than 3 or 4 though.  Dave, how many empty
> members do you find yourself glomming together?  I often have several
> potentially empty members but usually have at least that many non-
> empty members to spread them around on (I have one example where
> wanted to glom two empty members onto a non-empty member).

boost::bind( f, _1, _2, _3, _4, _5 ) has five empty members. :-)