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Subject: Re: [boost] [MPL][vector] Is there interest in mpl::vector using variadic templates?
From: Antony Polukhin (antoshkka_at_[hidden])
Date: 2017-03-01 18:56:35

2017-02-21 13:52 GMT+03:00 Михаил Максимов via Boost <boost_at_[hidden]>:
> Dear community,
> I've recently started contributing to boost::variant. To speed up variant's
> compilation I'm implementing mpl::vector on variadic templates. For now
> status of new vector implementation is:
> made me wonder, is there interest in variadic templates implementation? Are
> there limitations for it's usefulness, which I did not see?

I'm very interested in patching MPL to be able to use variadic templates.

There are many C++ libraries and code that use MPL. Those libraries
can not switch from MPL to Metal or Hana because:
* they have to be usable in C++98/C++03 and C++11
* they have a huge code base that can not be simply migrated to new library
* they depend on third party libraries that use MPL and need the
ability to interact with those libraries

Moreover, making MPL variadic will not just speed up compilation, but also will:
* reduce executable size and improve startup times if MPL structure is
part of an exported entity
* improve runtime speed if MPL structure is part of an entity that is
used in operations involving typeid()

So please, continue the work and make a pull request.

Best regards,
Antony Polukhin

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