The joy (?) of C++98 argument forwarding

From:
"Alf P. Steinbach" <alfps@start.no>
Newsgroups:
comp.lang.c++
Date:
Mon, 03 May 2010 11:48:51 +0200
Message-ID:
<hrm69v$96j$1@news.eternal-september.org>
Consider ...

<code>
// Copyright (c) Alf P. Steinbach, 2010.
#include "_config.h"

#include <progrock/cppx/pointers/Shared.h>
#include <iostream>

namespace {
     using namespace progrock;

     cppx::Size count = 0;

     class Foo
     {
     protected:
         ~Foo()
         {
             using namespace std;
             --count;
             cout << "Foo destroyed" << endl;
         }

     public:
         Foo()
         {
             using namespace std;
             cout << "Foo constructed" << endl;
             ++count;
         }

         Foo( int x )
         {
             using namespace std;
             cout << "Foo constructed with arg " << x << endl;
             ++count;
         }

         Foo( int x, char const s[] )
         {
             using namespace std;
             cout << "Foo constructed with args " << x << " and \"" << s << "\""
<< endl;
             ++count;
         }
     };

     void test()
     {
         using namespace cppx;

         Shared< Foo > r1 = newObject();
         assert( count == 1 );

         Shared< Foo > r2( r1 );
         assert( count == 1 );

         Shared< Foo > r3( newObject(), args( 42 ) );
         assert( count == 2 );

         Shared< Foo > r4( newObject(), args( 42, "blah blah" ) );
         assert( count == 3 );

         r4 = r2;
         assert( count == 2 );

         r3 = r2;
         assert( count == 1 );

         r3 = r3;
         assert( count == 1 );
     }
}; // namespace anon

void testShared()
{
     test();
     assert( count == 0 );
}
</code>

Is the notation in the 'test' routine OK, or would it be better (in some sense)
with some macro, e.g. like

   Shared< Foo > r( CPPX_NEW_SHARED( 42, "blah blah" ) );

?

Cheers,

- Alf (notation-aware)

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