Re: how to include a c struct in C++ namespace

From:
Victor Bazarov <v.Abazarov@comAcast.net>
Newsgroups:
comp.lang.c++
Date:
Wed, 25 Mar 2009 00:14:55 -0400
Message-ID:
<gqcb42$6ht$2@news.datemas.de>
ethan.liuyi@gmail.com wrote:

Hi,

I am trying to wrap c functions with some exception handling, for
example, wrap the socket bind in A::Bind

a.h
namespace A {
 int Bind(int fd, struct sockaddr *addr, socklen_t addrlen) throw
(inet_error);
}

a.cc
namespace A {
 int Bind(int fd, struct sockaddr *addr, socklen_t addrlen) throw
(inet_error) {
    /* if error, throw; otherwise return; */
 }
}

The problem is this generates link error,
 error: reference to ?sockaddr? is ambiguous....

 it seems the compiler think I define a new struct, with the same name
"sockaddr" in name space A, I tr
ied to remove the struct keyword, and it wouldn't compile.

in A, I have to reference to the global C struct, sockaddr etc.
in main(), I have to use those global C structs together with
functions I defined in A.

I am a bit confused here, I didn't define any new struct in A.

so I guess my question is, is there a simple and clean way to use a C
struct within a user defined namespace in C++?


You can always qualify the type-id from outside of the namespace:

    namespace A {
       int Bind(int, ::sockaddr*, ::socklen_t) throw(ine_error);
    }

That should disambiguate the names of the types.

V
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