Microsoft Visual C++ 14 Official
Prior to VC++ 14.0, Microsoft faced increasing criticism from the C++ community for non-conformance with the ISO C++11 standard, which had been finalized in 2011. Visual Studio 2013 (VC++ 12.0) implemented only partial C++11 support and lacked many C++14 features.
"Analysis of C++11 Optimizations in Visual Studio 2015" microsoft visual c++ 14
Search for "Visual Studio 2015 C++ What's New" in the Microsoft Learn archives. Prior to VC++ 14