In article <3c7g47$bhp@hpsystem1.informatik.tu-muenchen.de> schuenem@Informatik.TU-Muenchen.DE (Ulf Schuenemann) writes:
>
>    namespace A {
>[...]
>        ostream& operator<<(ostream& os, const X& x) {
>            return os << x.x;
>        }
>    }
>
>How do I just get this one operator from the namespace?
>A using-declartion wants an identifier. Is "operator<<" an
>identifier (in this case or generally)? Can I write:
>
> using A::operator<<;

 Yes. But:

 A::X x;
 cout << x; // woops! Doen't work.
 cout.A::operator<<(x); // works but is unacceptably ugly

Having to write that is not on. A solution is being sought.

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How to define an output-operator for a class in a namespace?
(I tested the following example with Metaware High C++ 3.2 for OS/2.)
Please answer per email, too. Thanks.

    // headerfile n.h
    #include <iostream.h>

    namespace A {
        class X {
        friend ostream& operator<<(ostream&, const X&);
        public:
            X(int);
        private:
            int x;
        };
    }

    // file n.cpp
    // #include "n.h"

    namespace A {
        X::X(int i) : x(i) {}

        ostream& operator<<(ostream& os, const X& x) {
            return os << x.x;
        }
    }

    // file test.cpp
    // #include "n.h"

    int main() {
        A::X x(10);
        cout << x;               // error
        A::operator<<(cout, x);  // ok, but this isn't what I want...
        return 0;
    }

What is namespace?
thanx
amritansh

In article <RAGHAV.94Dec5131953@deneb.cs.binghamton.edu> raghav@deneb.cs.binghamton.edu (_) writes:

   What is namespace?


Have a look at the following document:

ftp world.std.com
cd AW/stroustrup2e
get iso.ps

- Stefan

You need to put a 'using namespace A;' statement into your file.  This 'opens'
the namespace and allows reference to the symbols within it.
--
Mark Mendell
C Set ++ for AIX Development
IBM Toronto Lab
mendell@vnet.ibm.com

In article <3c29vl$1rkm@tornews.torolab.ibm.com>, mendell@opus.torolab.ibm.com (Mark Mendell) writes:
|> You need to put a 'using namespace A;' statement into your file.  This 'opens'
|> the namespace and allows reference to the symbols within it.
|> --

    namespace A {
[...]
        ostream& operator<<(ostream& os, const X& x) {
            return os << x.x;
        }
    }

How do I just get this one operator from the namespace?
A using-declartion wants an identifier. Is "operator<<" an
identifier (in this case or generally)? Can I write:

 using A::operator<<;


Ulf Schuenemann

--------------------------------------------------------------------
Ulf Sch   nemann
Institut f   r Informatik, Technische Universit   t M   nchen.
email: schuenem@informatik.tu-muenchen.de