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**Boost.PolyCollection**: fast containers of polymorphic objects.
[Online docs](http://boost.org/doc/libs/master/libs/poly_collection)
[Online docs](http://boost.org/libs/poly_collection)
[Seminal article at bannalia.blogspot.com](http://bannalia.blogspot.com/2014/05/fast-polymorphic-collections.html)
Typically, polymorphic objects cannot be stored *directly* in regular containers
and need be accessed through an indirection pointer, which introduces performance
problems related to CPU caching and branch prediction. Boost.PolyCollection
implements a
[novel data structure](http://www.boost.org/doc/libs/master/doc/html/poly_collection/an_efficient_polymorphic_data_st.html)
[novel data structure](http://www.boost.org/doc/html/poly_collection/an_efficient_polymorphic_data_st.html)
that is able to contiguously store polymorphic objects without such indirection,
thus providing a value-semantics user interface and better performance.
Three *polymorphic collections* are provided:
* [`boost::base_collection`](http://www.boost.org/doc/libs/master/doc/html/poly_collection/tutorial.html#poly_collection.tutorial.basics.boost_base_collection)
* [`boost::function_collection`](http://www.boost.org/doc/libs/master/doc/html/poly_collection/tutorial.html#poly_collection.tutorial.basics.boost_function_collection)
* [`boost::any_collection`](http://www.boost.org/doc/libs/master/doc/html/poly_collection/tutorial.html#poly_collection.tutorial.basics.boost_any_collection)
* [`boost::base_collection`](http://www.boost.org/doc/html/poly_collection/tutorial.html#poly_collection.tutorial.basics.boost_base_collection)
* [`boost::function_collection`](http://www.boost.org/doc/html/poly_collection/tutorial.html#poly_collection.tutorial.basics.boost_function_collection)
* [`boost::any_collection`](http://www.boost.org/doc/html/poly_collection/tutorial.html#poly_collection.tutorial.basics.boost_any_collection)
dealing respectively with classic base/derived or OOP polymorphism, function wrapping
in the spirit of `std::function` and so-called