Adding test case for bug 2080889.

git-svn-id: svn://svn.code.sf.net/p/loki-lib/code/trunk@906 7ec92016-0320-0410-acc4-a06ded1c099a

test/SmartPtr/colvin_gibbons_trick.cpp

@@ -0,0 +1,121 @@
+////////////////////////////////////////////////////////////////////////////////
+// Test program for The Loki Library
+// Copyright (c) 2008 Richard Sposato
+// Permission to use, copy, modify, distribute and sell this software for any
+//     purpose is hereby granted without fee, provided that the above copyright
+//     notice appear in all copies and that both that copyright notice and this
+//     permission notice appear in supporting documentation.
+// The authors make no representations about the
+//     suitability of this software for any purpose. It is provided "as is"
+//     without express or implied warranty.
+////////////////////////////////////////////////////////////////////////////////
+
+// $Id$
+
+
+// ----------------------------------------------------------------------------
+
+
+// loki_smart_auto_ptr.cpp Test program for Loki::SmartPtr configured as
+// auto_ptr using Colvin-Gibbons trick
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <loki/SmartPtr.h>
+
+#include <memory>
+#include <iostream>
+#include <cstdlib>
+
+
+using namespace Loki;
+using namespace std;
+
+
+// ----------------------------------------------------------------------------
+
+class Base
+{
+public:
+    virtual ~Base() {}
+
+    virtual void Hello() { cout << "Base Hello, world!" << endl; }
+};
+
+// ----------------------------------------------------------------------------
+
+class Derived: public Base
+{
+public:
+    virtual void Hello() { cout << "Derived Hello, world!" << endl; }
+};
+
+
+// ----------------------------------------------------------------------------
+
+typedef auto_ptr< Base > AutoPtrBase;
+typedef auto_ptr< Derived > AutoPtrDerived;
+
+typedef SmartPtr< Base, DestructiveCopy > SmartAutoPtrBase;
+typedef SmartPtr< Derived, DestructiveCopy > SmartAutoPtrDerived;
+
+
+// ----------------------------------------------------------------------------
+
+template <class TPtrBase>
+TPtrBase CreateBase()
+{
+    return TPtrBase( new Base );
+}
+
+// ----------------------------------------------------------------------------
+
+template <class TPtrDerived>
+TPtrDerived CreateDerived()
+{
+    return TPtrDerived( new Derived );
+}
+
+// ----------------------------------------------------------------------------
+
+template < class TPtrBase >
+void UseBase( TPtrBase ptr )
+{
+    ptr->Hello();
+}
+
+// ----------------------------------------------------------------------------
+
+template < class TPtrBase, class TPtrDerived >
+void DoTest()
+{
+    TPtrBase spb0 = CreateBase< TPtrBase >();
+    TPtrBase spb1( spb0 );
+
+    UseBase< TPtrBase >( CreateBase< TPtrBase >() );
+
+    TPtrDerived spd1 = CreateDerived< TPtrDerived >();
+    TPtrBase spb2( spd1 );
+
+    // NOTE: this does not compile with gcc 4.3.1 also for std::auto_ptr;
+    // it should work (Copy-initialization, base-from-derived)
+    // according to http://www.open-std.org/jtc1/sc22/wg21/docs/papers/1997/N1128.pdf
+    // It does compile with Visual C++ 8 (need to test with 9)
+    // UseBase<TPtrBase>(CreateDerived<TPtrDerived>());
+
+    // Quick fix
+    UseBase< TPtrBase >( TPtrBase( CreateDerived< TPtrDerived >() ) );
+}
+
+// ----------------------------------------------------------------------------
+
+void TryColvinGibbonsTrick( void )
+{
+    DoTest<AutoPtrBase, AutoPtrDerived>(); // OK
+    DoTest<SmartAutoPtrBase, SmartAutoPtrDerived>(); // FIXME: eror:
+    // assignment of read-only reference 'val'
+}
+
+// ----------------------------------------------------------------------------