boostorg/ublas — pull request #5 by awulkiew (2014-05-18 00:21:49+00:00)
Title: Fix the use of constexpr in msvc-12.0

Currently Ublas doesn't compile on msvc-12.0 because of invalid use of constexpr keyword.
This fix includes and replaces constexpr with BOOST_CONSTEXPR which should expand to nothing on compilers not supporting this keyword.