### Mixed Use of ‘class’ and ‘struct’ Keywords

If you enable the Inconsistent ‘class’ / ‘struct’ Usage setting, the compiler issues a warning if you use the class and struct keywords in the definition and declaration of the same identifier.

class X;
struct X { int a; }; // warning

Use this warning when using static or dynamic libraries to link with object code produced by another C++ compiler that distinguishes between class and structure variables in its name “mangling.”

This setting corresponds to pragma warn_structclass. To check this setting, use __option (warn_structclass).

See Checking Option Settings for information on how to use this directive.