They have their own compiler that goes by Visual C++ _____
Here is a mapping of the IDE version to the compiler version. They generally release a major compiler version with each major IDE version.
Visual Studio 2005 - Visual C++ 8.0
Visual Studio 2008 - Visual C++ 9.0
Visual Studio 2010 - Visual C++ 10.0
Visual Studio 2012 - Visual C++ 11.0
Visual Studio 2013 - Visual C++ 12.0
Visual Studio 2015 - Visual C++ 14.0
Visual Studio 2017 - Visual C++ 14.1
Visual Studio 2019 - Visual C++ 14.2
So to explicitly answer your question, Visual Studio 2015 uses the compiler Visual C++ 14.0
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