C++ private modifier ignored on nested anonymous struct
access-modifiers, anonymous-struct, c++, nested, private
Solution
Yes, it is a bug. Microsoft acknowledged it is, the feedback report is here.
Right now the bug is in "will not fix" status and it is unclear when (if ever) it will be addressed. There is a somewhat odd workaround for it, the IntelliSense parser built into Visual Studio, written by the Edison Design Group, does complain about it. You get the red squiggles and the message:
Error: member "Test.privateData" (declared at line 10) is inaccessible
Problem
The following sample code compiles just fine in Visual C++: ``` class Test { private: struct { struct { int privateData; }; }; }; int main(int, char **) { Test test; test.privateData = 0; return 0; } ``` But why? I'd expect a compiler error because the `privateData` member should be inaccessible to the function main, since it's supposed to be `private` like its container's container. I know that nameless structs are not part of official C++, but this design is asinine. By the way I've also tried to change `private` into `protected` and `struct` into `union`: it looks like the compiler refuses to honor access modifiers on anonymous structs and unions that are nested inside another anonymous struct or union. Can someone explain this feature?