Description

The macro defines a mixin in the domain. Call this once per mixin in a compilation unit (.cpp file). A good idea is, if possible, to place it in the compilation unit of the mixin class itself.

To work properly, the macro needs to see a forward declaration of the mixin (by BOOST_DECLARE_MIXIN or BOOST_DECLARE_EXPORED_MIXIN).

Mixin features: The features argument is an ampersand (&) separated list of the features - messages, allocators, and others - that the mixin will support. If the features have a special suffix (as messages do), it applies here.

If the mixin has no features, then boost::mixin::none should be set as the last argument

Example: 

BOOST_DEFINE_MIXIN(mymixin, foo_msg & priority(1, bar_msg) & allocator<myalloc>);
BOOST_DEFINE_MIXIN(simple_mixin, none);