typo in factory documentation example code

[Erik Sjölund <erik.sjolund@…>]

At this page: http://www.boost.org/doc/libs/1_44_0/libs/functional/factory/doc/html/index.html

this line seems wrong:

std::auto_ptr<an_abstract_factory> x = factories[some_name]->create();

I think it should be:

std::auto_ptr<an_abstract_class> x = factories[some_name]->create();

cheers,
Erik Sjölund

[Steven Watanabe]

This example is wrong for any number of reasons:

• It requires an illegal implicit conversion from a pointer to an auto_ptr.
• It attempts to create an object of an abstract class a_factory (in ptr_map::operator[])
• It treats the result of factories[some_name] as a pointer. It should be a reference.

[Steven Watanabe]

(In [71064]) Make sure this example compiles. Fixes #4548.