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added references to variant_collection

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joaquintides
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@@ -13,16 +13,18 @@ implements a
[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:
Four *polymorphic collections* are provided:
* [`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)
* [`boost::variant_collection`](http://www.boost.org/doc/html/poly_collection/tutorial.html#poly_collection.tutorial.basics.boost_variant_collection)
dealing respectively with classic base/derived or OOP polymorphism, function wrapping
in the spirit of `std::function` and so-called
in the spirit of `std::function`, so-called
[*duck typing*](https://en.wikipedia.org/wiki/Duck_typing) as implemented by
[Boost.TypeErasure](http://www.boost.org/libs/type_erasure).
[Boost.TypeErasure](http://www.boost.org/libs/type_erasure),
and variant-like _closed polymorphism_.
## Learn about Boost.PolyCollection