// _MSC_VER Defined as an integer literal that encodes the major and minor
// number elements of the compiler's version number. The major number is
// the first element of the period-delimited version number and the minor
// number is the second element. For example, if the version number of the
// Visual C++ compiler is 17.00.51106.1, the _MSC_VER macro evaluates to 1700.
// https://msdn.microsoft.com/en-us/library/b0084kay.aspx

_MSC_VER