Re: [boost] [Variant] C++11 variadic template implementation

Subject: Re: [boost] [Variant] C++11 variadic template implementation
From: sfields (stuartfields3_at_[hidden])
Date: 2012-09-11 03:05:25

Mathias Gaunard-2 wrote
> 
> On 15/04/12 11:57, Florian Goujeon wrote:
>> Hi Boosters,
>>
>> I'd like to know if anybody were working on a C++11 version (using
>> variadic
>>
>> templates) of Boost.Variant.
> 
> Variadic templates would not help at all with Boost.Variant.
> 
> 
>> I've written an implementation.
> 
> Did you find a magic way to make a switch statement from a template 
> parameter pack?

Why not just use template partial specialization to explicitly expand the
first N template arguments into a switch statement and  recursively expand
the remaining arguments in the default case if that fails?  Something along
the lines of recursive_apply <Args...>::apply(index) with the default case
calling recursive_apply <Tail...>::apply(index-N) should suffice...is there
some subtly I'm missing here?

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