Exercises, examples and other material relating to training module U198. This topic is presented on public courses Learning to program in Lua
, Lua Programming
, Lua Programming
Realease 5.2 of Lua includes a number of enhancements which are included in this module. This module will be included in course notes as a separate section, but the material is covered thoughout the course in an appropriate way for the particular requirements of the delegate group.
|Articles and tips on this subject||updated|
|3690||Changes in Lua 5.2 - Garbage Collection|
The garbage collection changes aren't coding changes - they will effect the internal efficiency and fix some issues there. Ephemeron tables are somewhat linked as they're providing a solution to a garbage collection issuse that required solution.
There's a change to a generational collector at some ...
|3686||The goto statement in Lua|
In the past there was considerable debate in academia and industry on the merits of the use of goto statements, and indeed Lua didn't have them until release 5.2. Well used in Lua, they can provide an escape from inner loops, jumping to a label using a ::label:: format. For example:
|3683||Weak references in Lua - what are they, and why use them?|
In programming languages where memory is allocated dynamically (that applies to most of the languages we teach), there has to be a mechanism to gather up memory that is no longer used as the program is running so that it can be re-allocated later within the same program, and that mechanism is usually ...
|3687||Binary / bitwise operations in Lua with the standard bit32 library|
If you want to do bit manipulation in Lua, you can use the bit32 library (which is loaded as a table) from Lua 5.2, and it's backported to newer Lua 5.1 versions as well. Bit manipulation is particularly useful in applications where data is packed into a series of bytes - in effect an array of booleans.
Examples from our training material
|bitwise|| The bit32 library|
|gotolua|| Lua goto - introduced in 5.2|
|wrt|| Weak references - set up and practical use|
Some modules are available for download
as a sample of our material or under an Open Training Notes License
for free download from [here]
Topics covered in this module
Yieldable pcall and metamethods.
Lexical scheme for globals.
Library for bitwise operations.
Light C functions.
Emergency garbage collector.
Finalizers for tables.
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