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Pantheios was designed to be an Open Source C/C++ Logging API library, offering an optimal combination of 100% type-safety, efficiency, genericity and extensibility.

Pantheios supports filtering of log messages based on severity level including (but not limited to) the eight levels defined by the SysLog protocol.

Pantheios supports back-end output, individually and in combination, to stderr/stdout, SysLog (including a custom implementation of the SysLog protocol for Windows), Win32 debugger, Win32 event log, COM Error Object, or any custom back-end extension you care to write. Importantly, Pantheios is readily extended to use the existing transport mechanisms of feature-rich logging libraries such as ACE, log4cpp, log4cplus, log4cxx.

Pantheios does not contain any compiler-specific or platform-specific constructs. It supports UNIX (including Linux and Mac OS-X), and Windows, and should work with any operating system. It is known to be compatible with Borland (5.5.1+), Comeau (4.3.3+), Digital Mars (8.45+), GCC (3.2+), Intel (6+), Metrowerks (8+), Microsoft Visual C++ (5.0+), and should work with any reasonably modern C++ compiler.

Pantheios was forked from a previous logging architecture, proprietary to Synesis Software, in 2005, and has been used in a number of commercial projects since that time. In one project it serves a middleware suite that handles 10s of millions of financial transactions per week, wherein it has an unmeasurably low impact on performance when logging (of a given severity level) is switched off. (It's also decidedly quick with logging switched on, of course ...)