svn commit: r580404 - /incubator/qpid/trunk/qpid/cpp/src/qpid/log/Helpers.h

[ac...@apache.org]

Author: aconway
Date: Fri Sep 28 09:22:55 2007
New Revision: 580404

URL: http://svn.apache.org/viewvc?rev=580404&view=rev
Log:
	* src/qpid/log/Helpers.h: Format complex types for log messages

Added:
    incubator/qpid/trunk/qpid/cpp/src/qpid/log/Helpers.h   (with props)

Added: incubator/qpid/trunk/qpid/cpp/src/qpid/log/Helpers.h
URL: http://svn.apache.org/viewvc/incubator/qpid/trunk/qpid/cpp/src/qpid/log/Helpers.h?rev=580404&view=auto
==============================================================================
--- incubator/qpid/trunk/qpid/cpp/src/qpid/log/Helpers.h (added)
+++ incubator/qpid/trunk/qpid/cpp/src/qpid/log/Helpers.h Fri Sep 28 09:22:55 2007
@@ -0,0 +1,79 @@
+#ifndef QPID_LOG_HELPERS_H
+#define QPID_LOG_HELPERS_H
+
+/*
+ * 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 <boost/range.hpp>
+
+#include <ostream>
+
+namespace qpid {
+namespace log {
+
+/** @file Helper classes for logging complex types */
+
+/// @internal
+template <class Range>
+struct ListFormatter {
+    typedef typename boost::range_const_iterator<Range>::type Iterator;
+    boost::iterator_range<Iterator> range;
+    const char* separator;
+
+    ListFormatter(const Range& r, const char* s=", ") : range(r), separator(s) {}
+};
+
+/// @internal
+template <class Range>
+std::ostream& operator<<(std::ostream& out, const ListFormatter<Range>& sl) {
+    typename ListFormatter<Range>::Iterator i = sl.range.begin();
+    if (i != sl.range.end()) out << *(i++);
+    while (i != sl.range.end()) out << sl.separator << *(i++);
+    return out;
+}
+
+/** Return a formatting object with operator <<
+ *  to stream range as a separated list.
+ *@param range: a range - all standard containers are ranges,
+ * as is a pair of iterators.
+ *@param separator: printed between elements, default ", "
+ */
+template <class Range>
+ListFormatter<Range> formatList(const Range& range, const char* separator=", ") {
+    return ListFormatter<Range>(range, separator);
+}
+
+/** Return a formatting object with operator <<
+ *  to stream the range defined by iterators [begin, end)
+ *  as a separated list.
+ *@param begin, end: Beginning and end of range.
+ *@param separator: printed between elements, default ", "
+ */
+template <class U, class V>
+ListFormatter<std::pair<U,V> > formatList(U begin, V end, const char* separator=", ") {
+    return formatList(std::make_pair(begin,end), separator);
+}
+
+
+}} // namespace qpid::log
+
+
+
+#endif  /*!QPID_LOG_HELPERS_H*/

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