Compiler Error C2723

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'function' : 'specifier' storage-class specifier illegal on function definition

The given specifier is not allowed on a function definition appearing outside of a class declaration. The virtual specifier can only be specified on a member function declaration appearing within the class declaration.

The following is an example of this error:

struct X
{
   virtual void f();
   virtual void g();
};
virtual void X::f() {} // error, virtual specifier
void X::g() {}         // OK