Re: [Boost-users] [boost-users][Variant] Sequence instantiation

Subject: Re: [Boost-users] [boost-users][Variant] Sequence instantiation
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2009-08-26 00:12:01

AMDG

Ryan McConnehey wrote:
> I have a sequence of types defined with the Loki library.  I believe 
> the equivalent would be boost::mpl::vector.  The sequence is used to 
> cause compile time asserts for unsupported types being passed to 
> template functions.  Boost variant can be created with a given list of 
> types.
>
> typedef boost::variant< int, std::string, short, long > type_list;
> | <boost/variant.html>|
> Is it possible to create a variant from a sequence by either passing 
> the sequence or iterating through each value in the sequence?  This 
> would reduce the code duplication of having one sequence for assert 
> checking and the other for variants.

Use the metafunction boost::make_variant_over.

In Christ,
Steven Watanabe