Category Archives: C/C++

Changing people or changing rules

Posted on 2009-05-16 by Gustavo Niemeyer

In my previous post I made an open statement which I’d like to clarify a bit further: (…) when the rules don’t work for people, the rules should be changed, not the people. This leaves a lot of room for … Continue reading →

Posted in C/C++, Java, Python | Leave a comment

Class member access control: enforcement vs. convention

Posted on 2009-05-15 by Gustavo Niemeyer

For a long time I’ve been an advocate of Python’s notion of controlling access to private and protected members (attributes, methods, etc) with conventions, by simply naming them like “_name”, with an initial underline.  Even though Python does support the … Continue reading →

Posted in C/C++, Java, Python | 24 Comments

Comparing package versions in PostgreSQL

Posted on 2006-07-30 by Gustavo Niemeyer

This weekend I’ve played a bit with PostgreSQL extensions written in C. A while ago I wrote a Python C extension for Smart to compare Debian package versions. Now I was trying to do something similar inside PostgreSQL, and thus … Continue reading →

Posted in C/C++, PostgreSQL, Project, Python | 1 Comment

Smart Package Manager is out!

Posted on 2004-12-09 by Gustavo Niemeyer

After 6 months of fun working on the project in silence, Smart Package Manager was finally released. As the README says: The Smart Package Manager project has the ambitious objective of creating smart and portable algorithms for solving adequately the … Continue reading →

Posted in C/C++, Project, Python | Leave a comment

Embedding Lua interpreter into RPM

Posted on 2004-03-23 by Gustavo Niemeyer

I’ve recently committed into the RPM CVS HEAD the internal support for Lua scripts. Please, notice that this is experimental stuff. Why embedding Lua in RPM? Many scripts execute simple operations which in an internal interpreter require no forking at … Continue reading →

Posted in C/C++, Lua, Patch | Leave a comment

More additions to APT-RPM Lua interface

Posted on 2004-03-14 by Gustavo Niemeyer

The APT-RPM Lua interface is constantly being improved. This time, the following functions were added: pkgid() and verid() Return a unique integer identifying a package or a version. verpkg() Returns the parent package of some given version. verdeplist() Returns a … Continue reading →

Posted in C/C++, Lua, Project | Leave a comment

New KDE frontend for APT-RPM

Posted on 2004-03-11 by Gustavo Niemeyer

Here is a screenshot of Kynaptic, a new experiment I’m working on. This is a KDE-based frontend for APT-RPM and APT. Kynaptic is based on Synaptic, and shares the same base code on top of the APT library. On the … Continue reading →

Posted in C/C++, Project | 1 Comment

Toy interpreter for Linear Algebra

Posted on 2004-03-02 by Gustavo Niemeyer

While working with Linear Algebra, I’ve decided to build a toy interpreter in C to play around. This was a quite interesting experiment for myself, since it was the first time I’ve built a complete (with tokenizer, compiler, and interpreter) … Continue reading →

Posted in C/C++, Math, Project | 1 Comment

New RPM transaction locking

Posted on 2004-03-01 by Gustavo Niemeyer

Last week I’ve worked with Jeff Johnson to fix a small RPM issue which was bothering us for quite some time. Until this change, RPM was accepting two transactions to be run at the same time but, unfortunately, this might … Continue reading →

Posted in C/C++, Patch | Leave a comment

Compiler warnings in Python’s SRE

Posted on 2004-02-17 by Gustavo Niemeyer

After a long time, and many people complaining about it, I finally took some time to fix some annoying compiler warnings in Python’s regular expression engine. Since it’s a rather uncommon case, I’ll explain it here with a quick example. … Continue reading →

Posted in C/C++, Patch, Python | Leave a comment