Re: [Boost-users] Sequence of Types, What For?

From: Ovanes Markarian (om_boost_at_[hidden])
Date: 2006-10-17 12:54:35

Just take a look at boost::variant data structure.

It allows you to store _one_ of enumerated types in the container. If you try to put some not
registered type instance into it you will get a compiler error. I think this data structure is
pretty cool.

What if such a variant<types 1...n> represents a communication protocol which can contain one of
enumerated message type instance. In this case the sender can not put there a message
(per-compiler) which should not be there (not allowed). And a receiver can be 100% sure that it
will not receive a message which should not be handled.

With Kind Regards,

Ovanes Markarian

On Tue, October 17, 2006 04:49, Terry G wrote:
> I've just finished reading C++ Template Metaprogramming again.
> I just don't get it.
>
> Why would someone use a type container?
>
> I have used enable_if, along with some of the logic functions for managing
> an overload set.
> Otherwise, I'm clueless.
>
> I'd really like a reference to an MPL primer or some case studies.
>
> Too much pain with very little gain.  Time to ask for help.
> Rereading this, it sounds negative.
> Really, I think the MPL is really cool!
>
> terry
>
>
>
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