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README.md

GXLib

GLib is a wonderful library that provides (among others) many of the basic data structures one needs when programming in C, such as lists and hash-tables.

GXLib is a library that provides extensions to GLib that I'm using for my own programs. Since it depends on GLib 2.x (2.38 or later), GXLib's versioning also starts with 2.x.

So far, there are a number of extensions fo GList that allow for using it with a functional flavor, and takes inspiration from Mozilla's Rust and Scheme's SRFI-1 and the way they allow for solving problems such as those from Project Euler.

Documentation

All functions have been documented, many with examples. See here.

Examples

Here are some examples. If you're not familiar with map and fold etc., it might look a little bit bewildering at first, esp. since you can probably think of a way to do it with an explicit loop.

However, after getting used to them, they provide a very natural and clean way to express solutions to problems. And not only for the kind of mathematical puzzles that are so useful for small examples.

Product of primes

Let's take the product of the prime numbers up to 20. We could make a one-liner, but let's do it step by step.

First, create a list of numbers 1..20, using gx_list_iota:

gint prod;
GList *nums;
nums = gx_list_iota (20 /*number*/, 1/*start*/, 1/*step*/);

Now, we filter out any non-prime numbers. And we do it in-place (ie., changing the list we have, rather than making copy).

nums = gx_list_filter_in_place (nums, (GXPred)gx_is_prime, NULL, NULL);

finally, we take the product:

prod = gx_list_product (nums); /* 9699690 */
g_list_free (nums);

Contributing

GXLib is a young library, so there is ample opportunity for adding more functionality.... contributions are welcome! Here are some guidelines:

  • Follow the existing coding style; like GLib itself, GXLib uses the GNU-coding style. It looks a bit unusual in the beginning, but one gets used to it quickly. In Emacs: C-c . gnu RET.
  • We strive to keep the code-coverage for the tests at 100%. So for each function, there needs to be one or more unit tests (in the tests/ directory).
  • When documenting things, follow the gtk-doc style already in use. If you add example code to the documentation, add the code snippet to test-examples.c as well, so they can be unit-tested, too. Always nice if the example code keeps working!

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