RE: [boost] Re: instantiation_count (was: is_incomplete)

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2002-10-27 03:44:24

Rani Sharoni wrote:
>  > Seems well-formed to me, and works with Intel C++ 6.0 and one other
>  > compiler.
> 
> VC7.1/7/6 also compiled the code but Comead 4.3.0.1 (EDG 
> based) rejected the code. I suspect that Comeau's EDG, unlike 
> the Intel's EDG, is correct because you are actually injecting 
> names into the namespace and C++ doesn't allow that. 

It might turn out that Comeau is correct after all (I am going to clarify
that on comp.std.c++), but for sure it won't be for the reason you cited
above :). Friend functions declared inside class definitions are found
through the Koenig lookup:

    template< typename T > struct her
    {
        friend void foo(her<T> const&);
    };

    int main()
    {
        her<int> h;
        foo(h); // prefectly OK
    }

See 7.3.1.2 [namespace.memdef] para 3 for the details.

Aleksey