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extern/stdcxx/4.2.1/tests/regress/21.string.stdcxx-231.cpp

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+/************************************************************************
+ *
+ * 21.string.stdcxx-231.cpp - test case from STDCXX-231 issue
+ *
+ * $Id$
+ *
+ ***************************************************************************
+ *
+ * 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.
+ *
+ **************************************************************************/
+
+#include <cassert>
+#include <string>
+#include <sstream>
+
+int main ()
+{
+    std::string s (100, 's');
+
+    const std::string::size_type n = s.capacity ();
+    const std::string::const_pointer p = s.c_str ();
+
+    // verify getline(), clear(), erase() and replace() do not
+    // unnecessarily resize or reallocate the data buffer
+    std::istringstream is ("hello world");
+    std::getline (is, s);
+    assert (s.capacity () == n);
+    assert (s.c_str ()    == p);
+
+    s.clear ();
+    assert (s.capacity () == n);
+    assert (s.c_str ()    == p);
+
+    s.erase ();
+    assert (s.capacity () == n);
+    assert (s.c_str ()    == p);
+
+    s.replace (0, std::string::npos, "1", 0);
+    assert (s.capacity () == n);
+    assert (s.c_str ()    == p);
+
+    return 0;
+}
+