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A freely available lib for assertion checking and logging in GNU C and C++. It's smaller and faster compared to assert.h, and assertions can refer to a saved state. Logging messages can be redirected to destinations including files, processes, or circular buffers in core. These features can be selectively enabled at both compile and runtime. Lists of invariant checking or printing functions can be created which can then be called to check internal consistency or display state. You can find your errors sooner, when it's faster and cheaper to correct them.


User reference manual available in HTML format from

Heckert gnu.small.png This is a GNU package:nana


Download version 2.5 (stable)
released on 12 September 1999


Related Projects


LicenseVerified byVerified onNotes
GPLv2orlaterJanet Casey31 January 2001

Leaders and contributors

Harald Mueller Contributor
Phil Maker Maintainer

Resources and communication

Audience Resource type URI
Developer,Help E-mail
Bug Tracking E-mail

Software prerequisites

This entry (in part or in whole) was last reviewed on 16 May 2005.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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