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Some lousy simple logger
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// Internal Combustion Engine | |
// | |
// Written in 2012 by Martinho Fernandes <martinho.fernandes@gmail.com> | |
// | |
// To the extent possible under law, the author(s) have dedicated all copyright and related | |
// and neighboring rights to this software to the public domain worldwide. This software is | |
// distributed without any warranty. | |
// | |
// You should have received a copy of the CC0 Public Domain Dedication along with this software. | |
// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>. | |
// Expanding variadic packs of side-effects | |
// Usage: | |
// ICE_EXPAND_SIDE_EFFECTS(f(T)) | |
#ifndef ICE_EXPAND_HPP | |
#define ICE_EXPAND_HPP | |
#include <initializer_list> | |
#define ICE_EXPAND_SIDE_EFFECTS(...) std::initializer_list<char>{ ((__VA_ARGS__), void(), 0) }; | |
#endif // ICE_EXPAND_HPP |
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// Internal Combustion Engine | |
// | |
// Written in 2012 by Martinho Fernandes <martinho.fernandes@gmail.com> | |
// | |
// To the extent possible under law, the author(s) have dedicated all copyright and related | |
// and neighboring rights to this software to the public domain worldwide. This software is | |
// distributed without any warranty. | |
// | |
// You should have received a copy of the CC0 Public Domain Dedication along with this software. | |
// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>. | |
// Logging facilities | |
// Usage: | |
// ICE_LOG(ice::ftr, ice::cerr) << "some log statement"; | |
#ifndef ICE_LOG_HPP | |
#define ICE_LOG_HPP | |
#include <expand.h++> | |
#include <sstream> | |
#include <string> | |
#include <initializer_list> | |
#include <iostream> | |
namespace ice { | |
namespace log { | |
enum level { | |
ftr, // debug | |
fyi, // info | |
wtf, // warning | |
omg, // error | |
fml, // fatal | |
}; | |
template <typename Sink, level Level> | |
struct forwarder : Sink { | |
public: | |
~forwarder() { Sink::write(ss.str()); } | |
template <typename T> | |
forwarder& operator<<(T const& t) { | |
ss << t; | |
return *this; | |
} | |
private: | |
std::stringstream ss; | |
}; | |
template <typename... Sinks> | |
struct sinks : private Sinks... { | |
void write(std::string const& str) { | |
ICE_EXPAND_SIDE_EFFECTS(Sinks::write(str)); | |
} | |
}; | |
struct cerr { | |
void write(std::string const& str) { | |
std::cerr << str << std::endl; | |
} | |
}; | |
} // namespace log | |
} // namespace ice | |
#define ICE_LOG(LEVEL, ...) ::ice::log::forwarder< ::ice::log::sinks< __VA_ARGS__ >, LEVEL>{} | |
#endif // ICE_LOG_HPP |
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