Re: [boost] Visual Studio 2015 Update 3 has removed std::unary_function and std::binary_function

Subject: Re: [boost] Visual Studio 2015 Update 3 has removed std::unary_function and std::binary_function
From: Vinnie Falco (vinnie.falco_at_[hidden])
Date: 2016-11-06 10:01:50

I seem to recall when I used boost::iterator::transform_iterator
(which requires a UnaryFunction in its template argument), if I did
not derive from std::unary_function I got a bunch of compile errors.
This is because some part of the iterator implementation is looking
for those nested types. So while the transform_iterator implementation
itself does not depend on std::unary_function, it does depend on some
or all of those types being present.

I'm not sure if this affects the discussion taking place here or not,
or what changes are needed if any - apologies if it is noise.