3log

3log is a name used by multiple software projects. The most commonly referenced usage is a lightweight logging library for C and C++, designed to be simple to integrate and to have a small footprint across platforms.

Features typically emphasized include minimal dependencies, fast logging paths, and support for multiple output destinations such as the console, files, and syslog. Many implementations are header-only or use a single-source library to simplify inclusion. They often provide multiple log levels (debug, info, warning, error) and may include formatting options, thread safety, and compile-time configuration of features. Licensing varies; MIT- and BSD-style licenses are common.

In addition to the logging library, the name 3log is used by other, unrelated projects, such as small blogging tools or data-logging utilities. Because the name is not unique, statements about 3log should specify the exact project and version by referencing its repository or official documentation.

Usage context: 3log–style libraries appeal to projects requiring minimal overhead, portability, and easy integration, including embedded systems, tools, and educational projects. They are generally used as a drop-in replacement for ad-hoc logging calls.

See also: List of logging libraries, Comparison of logging frameworks.