Optional to use either streaming or printf-like syntax
LOG(INFO) << "Simple to use with streaming syntax, easy as ABC or " << 123;
or
LOGF(WARNING, "Printf-style syntax is also %s", "available");
Conditional logging
int less = 1; int more = 2
LOG_IF(INFO, (less<more)) <<"If "<< less<< "<" << more<< ", then this text will be logged";
or
LOGF_IF(INFO, (less<more), "if %d<%d then this text will be logged", less,more);
Design-by-Contract
CHECK(less != more); // true: won't be FATAL
CHECK(less > more) << "CHECK(false) will trigger a FATAL message, put it on log, then exit";
WHAT IS G2LOG?
====================
In depth information can be found at http://www.codeproject.com/Articles/288827/g2log-An-efficient-asynchronous-logger-using-Cplus
Or just read the short summary below:
-------------------------------------
G2log is an asynchronous, "crash safe" logger and design-by-contract library. What this means in practice is that
1. All the slow I/O disk access is done in a background thread. This ensures that the other parts of the software can immediately continue with their work after making a log entry.
2. g2log provides logging, Design-by-Contract [#CHECK], and flush of log to file at shutdown. Buffered logs will be written to file before the application shuts down.
3. It is thread safe, so using it from multiple threads is completely fine.
4. It is CRAsH SAFE, in that it will catch certain fatal signals, so if your application crashes due to, say a segmentation fault, SIGSEGV, or some other fatal signals it will log and save to file this crash and all previously buffered log entries before exiting.
5. It is cross platform. For now, tested on Windows7 ad Ubuntu
6. On Ubuntu a caught fatal signal will generate a stack dump to the log. This is not yet available on Windows due to the platforms complexity when traversing the stack. Stack dump on Windows will be released later and a beta is available on request.
7. G2log is used in commercial products as well as hobby projects since early 2011.
The code is given for free as public domain. This gives the option to change, use, and do whatever with it, no strings attached.
8. The stable version of g2log is available at https://bitbucket.org/KjellKod/g2log
The in-development g2log where new features are tried out is available at
https://bitbucket.org/KjellKod/g2log-dev ongoing and released features can be seen at
Gtest must be unpacked before used, but it IS included by the CMake and you don't need to do install or compile it in any other way than through the g2log cmake setup.
Is made with standard C++ components with the help of the latest C++11 and std::thread features (thanks to justthread). For more details see www.kjellkod.cc/active-object-with-cpp0x. An example is provided. Other examples on pre C++0x Active Objects can also be found at www.kjellkod.cc (code page)
