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

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+/**************************************************************************
+ *
+ * rwexcept.cpp - Example program demonstrating the use of the optional
+ *                C++ Standard Library exception mechanism.
+ *
+ * $Id: rwexcept.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 <exception>      // for exception
+#include <iostream>       // for cerr
+#include <vector>         // for vector
+#include <cstdlib>        // for exit()
+
+#include <rw/_error.h>    // for __rw_throw_proc, _RWSTD_ERROR_BAD_CAST
+
+#include <examples.h>
+
+
+// function called from within the library to throw an exception
+void exception_handler (int id, char *what)
+{
+    std::cerr << "exception #" <<  id << ": " << what << '\n';
+
+    // free what buffer
+    if (what)
+        __rw::__rw_free_what_buf (what);
+
+    // a real program would call abort() here to prevent the potentially
+    // dangerous destruction of objects with static storage duration
+    // abort ();
+
+    // introduce exit into the current scope if it's declared in namespace
+    // std (as it should be) to allow referring to the function without
+    // qualification when <cstdlib> incorrectly declares it at file scope
+    using namespace std;
+
+    // successfully exit the process
+    exit (0);
+
+    // return at your own risk
+}
+
+
+// prevent the allocation of more than 4 elements
+struct Allocator: std::allocator<int>
+{
+    size_type max_size () const {
+        return 4;
+    }
+};
+
+
+int main ()
+{
+    typedef std::vector<int, Allocator> Vector;
+
+    Vector v;
+
+    for (Vector::size_type n = 0; n != 2 * v.max_size (); ++n) {
+        try {
+            // try to reserve storage for `n' values
+            v.reserve (n);
+        }
+        catch (std::exception &e) {
+            std::cerr << "caught an exception:" << e.what () << '\n';
+
+            // after the first exception has been caught
+            // replace the default throw procedure used
+            // by the library with a user-defined exception
+            // function and continue to iterate
+            __rw::__rw_throw_proc = exception_handler;
+        }
+    }
+
+    // should not reach
+    std::cerr << "unexpected return from main\n";
+
+    return 1;
+}