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#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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