From: "David Abrahams" <david.abrahams@[...].com> 
>  I think we have a bug in the iterator_adaptor documentation. Specifically,
>  this example: www.boost.org/libs/utility/iterator_adaptors.htm#example
puts
>  the result of calling std::bind1st inside an iterator_adaptor. One
standard
>  library implementation tried to default-construct one of these
>  iterator_adaptors and we discovered that std::binder1st can't be
>  default-constructed. I'd like to replace that part of the example with the
>  result of calling boost::bind() instead. I think it would be relatively
>  harmless to allow the result type of bind() to be default-constructed,
>  because nobody's going to name it anyway.

It's possible to make the result type of bind(f, a, b, ...)
default-construct[ia]ble provided that f, a, b have a default constructor.
reference_wrapper, for instance, doesn't have one.

I don't know. Doesn't seem the right way to fix the problem, but I've no
real objections, either.

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