On Wed, Jul 11, 2018 at 7:49 AM, degski via Boost
This thread shows how and why it's important to get boost to build with Clang/LLVM (clang-cl), as VS is (still) a moving target and clang probably already has it right. By reporting those bugs MS (which it possibly is), you'll also be helping VS (and your-selves) forward. Trying to fix a build of Boost with a vaporware like VS 15.6.6 seems a waste of time and is highly irrelevant.
I couldn't disagree more (although, Boost should also be compiled with clang-cl if it is not discontinued). The latest Visual Studio is not vaporware it is a released, shipping product which many people use to accomplish real work. And in fact, I suspect that Visual Studio actually fixed a bug which is what is causing this new compilation error. The code in question which fails is: BOOST_DEDUCED_TYPENAME difference_type n; This, to my eye, should not compile as the code appears in a class template where difference_type is a nested type of the base class and should not be visible unqualified. The resulting errors appear in the log I linked. Changing that code to the following: BOOST_DEDUCED_TYPENAME BidirectionalIteratorConcept<Iterator>::difference_type n; resolves the error for _MSC_VER >= 1912