libcruft-util/log.hpp

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/*
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* Licensed 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
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* 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.
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*
* Copyright 2012 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_LOG_HPP
#define __UTIL_LOG_HPP
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#include "nocopy.hpp"
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#include <iostream>
#include <string>
// Windows.h or one of its friends defines a macro 'ERROR'. Screw Microsoft.
#ifdef ERROR
#undef ERROR
#endif
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namespace util {
// rfc5424 log levels. It is assumed they are contiguous to simplify array
// indexing in logging code.
//
enum level_t {
EMERGENCY, /** system is unusable */
ALERT, /** action must be taken immediately */
CRITICAL, /** critical conditions */
ERROR, /** error conditions */
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WARNING,
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WARN = WARNING, /** warning conditions */
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NOTICE, /** normal but significant condition */
INFORMATIONAL,
INFO = INFORMATIONAL, /** informational messages */
DEBUG, /** debug-level messages */
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NUM_LEVELS,
DEFAULT = INFO
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};
std::ostream&
operator<< (std::ostream&, level_t);
void log (level_t, const std::string &format);
template <typename ...tail>
void log (level_t, const std::string &format, tail ..._tail);
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#define LOG_EMERGENCY(...) do { util::log(util::EMERGENCY, ##__VA_ARGS__); } while (0)
#define LOG_ALERT(...) do { util::log(util::ALERT, ##__VA_ARGS__); } while (0)
#define LOG_CRITICAL(...) do { util::log(util::CRITICAL, ##__VA_ARGS__); } while (0)
#define LOG_ERROR(...) do { util::log(util::ERROR, ##__VA_ARGS__); } while (0)
#define LOG_WARNING(...) do { util::log(util::WARNING, ##__VA_ARGS__); } while (0)
#define LOG_WARN(...) do { util::log(util::WARN, ##__VA_ARGS__); } while (0)
#define LOG_NOTICE(...) do { util::log(util::NOTICE, ##__VA_ARGS__); } while (0)
#define LOG_INFO(...) do { util::log(util::INFO, ##__VA_ARGS__); } while (0)
#if defined(ENABLE_DEBUGGING)
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#define LOG_DEBUG(...) do { util::log(util::DEBUG, ##__VA_ARGS__); } while (0)
#else
#define LOG_DEBUG(...) do { ; } while (0)
#endif
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class scoped_logger : public nocopy {
public:
scoped_logger (const level_t, const std::string&);
~scoped_logger ();
protected:
const level_t m_level;
const std::string &m_message;
};
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}
#include "log.ipp"
#endif