Re: Anonymous struct

[Ian Lance Taylor <iant@google.com>]

"John S. Fine" <johnsfine@verizon.net> writes:

> Can someone with a good understanding of the C++ standard tell me if
> this program is legal C++
>
> #include <iostream>
> int x = 1;
> int main(int argc, char** argv)
> {
>    struct {
>        int operator()( int y ) { return x + y; }
>    } fun;
>
>    std::cout << fun( 7 ) << std::endl;
>    return 0;
> }
>
> It compiles and runs with gcc 4.4.1.  I have done similar things in
> other situations many times, so I assumed that it was valid.
>
> But another compiler (not a version of GCC) reports:
>
> error C2627: member function defined in unnamed class
>
> I hope that other compiler is just wrong.  But I'd like someone with a
> better understanding of the standard to comment.

You are not permitted to define a member function in an anonymous
union, but I don't see any such restriction for an anonymous class or
struct.

Ian