Re: [Boost-users] large variant performance compared (50 elements)

Subject: Re: [Boost-users] large variant performance compared (50 elements)
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2011-01-09 18:35:10

On 09/01/2011 17:29, Steven Watanabe wrote:
> AMDG
>
> On 1/9/2011 6:03 AM, Mathias Gaunard wrote:
>> Writing a variant replacement is actually quite easy, and doing so
>> would greatly reduce your compile times.
>> Variant is old, full of quirks, and doesn't scale well. Why it even
>> requires its MPL input sequence to be Front Extensible (which it
>> doesn't even state in its documentation) is beyond me. This is a very
>> annoying limitation that makes it impractical to use with a large
>> amount of types, since compatibility with joint_view would be very
>> nice in that situation.
>
> So, why not fix Boost.Variant instead of having
> everyone roll his own?

Because, as I said, it's full of quirks.
Writing your own implementation that fits your needs, compiles fast and 
runs fast is way less effort than trying to get fixes into variant.