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extern/stdcxx/4.2.1/examples/manual/auto_ptr.cpp

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+/**************************************************************************
+ *
+ * auto_ptr.cpp - Example program of auto_ptr.
+ *
+ * $Id: auto_ptr.cpp 550991 2007-06-26 23:58:07Z sebor $
+ *
+ ***************************************************************************
+ *
+ * Licensed to the Apache Software  Foundation (ASF) under one or more
+ * contributor  license agreements.  See  the NOTICE  file distributed
+ * with  this  work  for  additional information  regarding  copyright
+ * ownership.   The ASF  licenses this  file to  you under  the Apache
+ * License, Version  2.0 (the  "License"); you may  not use  this file
+ * except in  compliance with the License.   You may obtain  a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the  License is distributed on an  "AS IS" BASIS,
+ * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
+ * implied.   See  the License  for  the  specific language  governing
+ * permissions and limitations under the License.
+ *
+ * Copyright 1994-2006 Rogue Wave Software.
+ * 
+ **************************************************************************/
+
+#include <iostream>   // for cout, endl
+#include <memory>     // for auto_ptr
+
+#include <examples.h>
+
+
+// A simple structure.
+class X
+{
+    int i_;
+
+public:
+
+    X (int i) : i_ (i) {
+        std::cout << "X::X (" << i_ << ')' << std::endl;
+    }
+
+    ~X () {
+        std::cout << "X::~X [" << i_ << ']' << std::endl;
+    }
+
+    int get () const { return i_; }
+};
+
+
+int main ()
+{
+    // a implicitly initialized to 0 (the null pointer)
+    std::auto_ptr<X> a;
+
+    // Establish a scope.
+    if (1) {
+        // b will hold a pointer to an X.
+        std::auto_ptr<X> b (new X (12345));
+
+        // a will now be the owner of the underlying pointer.
+        a = b;
+    }
+
+    std::cout << "b destroyed" << std::endl;
+
+        // Output the value contained by the underlying pointer.
+#ifndef _RWSTD_NO_NONCLASS_ARROW_RETURN
+        std::cout << a->get () << std::endl;
+#else
+        std::cout << (*a).get () << std::endl;
+#endif
+
+    // The pointer will be delete'd when a is destroyed on leaving scope.
+    return 0;
+}