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extern/stdcxx/4.2.1/tests/regress/27.ostream.unformatted.stdcxx-626.cpp

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+/************************************************************************
+ *
+ * 27.ostream.unformatted.stdcxx-626.cpp - regression test for STDCXX-626
+ *
+ * http://issues.apache.org/jira/browse/STDCXX-626
+ *
+ * $Id: 27.ostream.unformatted.stdcxx-626.cpp 612563 2008-01-16 20:31:30Z 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.
+ * 
+ ************************************************************************/
+
+#include <cassert>
+#include <ostream>
+
+int sync_calls;
+
+struct MyBuf: std::streambuf
+{
+    virtual int sync () {
+        ++sync_calls;
+        return -1;
+    }
+};
+
+
+int main ()
+{
+    MyBuf buf;
+
+    std::ostream os (&buf);
+
+    // verify that ostream::flush() doesn't call streambuf::sync()
+    // when the state of the stream isn't good
+
+    os.setstate (os.badbit);
+
+    os.flush ();
+
+    assert (0 == sync_calls);
+
+    os.setstate (os.eofbit);
+
+    os.flush ();
+
+    assert (0 == sync_calls);
+
+    os.setstate (os.failbit);
+
+    os.flush ();
+
+    assert (0 == sync_calls);
+
+    return 0;
+}