TCLAP is a small, flexible library that provides a simple interface for defining and accessing command line arguments. It was initially inspired by the user friendly CLAP library. The difference is that this library is templatized, so the argument class is type independent. Type independence avoids identical-except-for-type objects, such as IntArg, FloatArg, and StringArg. While the library is not strictly compliant with the GNU or POSIX standards, it is close.
TCLAP is written in ANSI C++ and is meant to be compatible with any standards-compliant C++ compiler. It is known to work on Linux, MacOS X, Windows, and Solaris platforms. The library is implemented entirely in header files making it easy to use and distribute with other software. It is licensed under the MIT License for worry free distribution.
TCLAP is now a mature, stable, and feature rich package. Please don't let any apparent project inactivity discourage you from using the software!
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NOTE: The current development version of TCLAP is 1.4, it is recommended for use by new projects. The stable version of TCLAP is 1.2 and it will only receive critical bug fixes. You can find the documentation for v1.2 here.