Default template parameters for any_range

[bromeon@…]

Would it be possible that more template parameters of boost::any_range get a default value?

It seems like Reference and Difference mostly refer to the same types. The declaration could look like this:

template<
            class Value
          , class Traversal
          , class Reference = Value&
          , class Difference = std::ptrdiff_t
          , class Buffer = use_default
        >
        class any_range;

This would also be consistent with boost::iterator_facade.

[Neil Groves]

Fix committed to the develop branch. The tests will need to cycle a few times and this should be merged for release 1.56