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Diffstat (limited to 'qpid/cpp/src/qpid/log/Helpers.h')
-rw-r--r-- | qpid/cpp/src/qpid/log/Helpers.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/qpid/cpp/src/qpid/log/Helpers.h b/qpid/cpp/src/qpid/log/Helpers.h new file mode 100644 index 0000000000..82ef8244be --- /dev/null +++ b/qpid/cpp/src/qpid/log/Helpers.h @@ -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*/ |