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

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 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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