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When needing very fast execution implying lots of Lua and C code, either push all data into C structures and work from there or push all data into Lua to avoid binding and function calls overhead. For example, it would be a bad idea to loop through all the pixels of an image using operator(int i) to implement a filter in Lua. C classes put into Lua¶ See this section here. Also check out a basic example, special functions example and initializers example! There are many more examples that show off the usage of classes in C, so please peruse them all carefully as it can be as simple or as complex as your needs are. Read the tutorial here(Code. In this video the basics for working on a project in lua C hybrid are finished up. The idea of binding is introduced along with a first simple type of binding.

Illustrative C Lua binding example/tutorial. GitHub Gist: instantly share code, notes, and snippets.

LuaBridge is a lightweight and dependency-free library for mapping data, functions, and classes back and forth between C++ and Lua (a powerful, fast, lightweight, embeddable scripting language) . LuaBridge has been tested and works with Lua revisions starting from 5.1.5., although it should work in any version of Lua from 5.1.0 as well as LuaJit.

LuaBridge offers the following features:

A printable Reference Manual.
Headers-only: No Makefile, no .cpp files, just one #include!
Simple, light, and nothing else needed (like Boost).
No macros, settings, or configuration scripts needed.
Supports different object lifetime management models.
Convenient, type-safe access to the Lua stack.
Automatic function parameter type binding.
Easy access to Lua objects like tables and functions.
Written in a clear and easy to debug style.

Please read the LuaBridge Reference Manual for more details on the API.

Unit Tests

Unit test build requires a CMake and C++11 compliant compiler.

There are 4 unit test flavors:

Tests51 - uses Lua 5.1, with C++11 features
Tests51L - uses Lua 5.1, no C++11 features
Tests52 - uses Lua 5.2, with C++11 features
Tests52L - uses Lua 5.2, no C++11 features

Build using Make on Linux/MacOS:

Generate XCode project on MacOS:

Generate MSVS solution on Windows:

LuaBridge provides both a command line program and a stand-alone graphical program for compiling and running the test suite. The graphical program brings up an interactive window where you can enter execute Lua statements in a persistent environment. This application is cross platform and works on Windows, Mac OS, iOS, Android, and GNU/Linux systems with X11. The stand-alone program should work anywhere. Both of these applications include LuaBridge, Lua version 5.2, and the code necessary to produce a cross platform graphic application. They are all together in a separate repository, with no additional dependencies, available on Github at LuaBridge Demo and Tests. This is what the GUI application looks like, along with the C++ code snippet for registering the two classes:

Official Repository

LuaBridge is published under the terms of the MIT License.

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The original version of LuaBridge was written by Nathan Reed. The project has been taken over by Vinnie Falco, who added new functionality, wrote the new documentation, and incorporated contributions from Nigel Atkinson.

For questions, comments, or bug reports feel free to open a Github issue or contact Vinnie Falco directly at the email address indicated below.

Portions from The Loki Library:
Copyright (C) 2001 by Andrei Alexandrescu

Older versions of LuaBridge up to and including 0.2 are distributed under the BSD 3-Clause License. See the corresponding license file in those versions (distributed separately) for more details.

This is Part 1a of my Integrating Lua into C++ Tutorial series.

There are plenty of scripting languages to work with when binding with C++. Everyone have their personal favorite and mine is Lua.

There are plenty of great tutorials out there that teaches on how to integrate C++ with Lua but I feel that those tutorials are kind of outdated. I feel that there are better ways to do things in 2018. As such, this tutorial counts on utilizing more updated libraries compared to most tutorials out there.

Why use a scripting language?

Lua-users Wiki: Binding Code To Lua

Source codes are usually compiled at compile-time while scripting languages are mostly compiled at run-time. As a game gets bigger, one might notice that compiling the entire code-base would take a long time, which results to a huge productivity hit.

As such, being able to tweak game logic without the need to recompile the code-base would result in a significant productivity boost. There are always people out there complaining about the time it takes to compile a code-base.

Lua C++ Binding Example Code

Some scripting languages, such as Lua, is also easy to learn. This means that non-programmers would be able to provide gameplay behaviors without having access to the main source codes.

With having an environment for the non-programmers to code (e.g. your scripting language), the programmers can effectively constraint the working environment of the non-programmers, for better or for worse. This ensures that the non-programmers are not able to overstep some boundaries, and write game breaking code out of the context that they were supposed to work in.

Scripting languages also makes it super easy to add modding support to your game. You can easily allow your players to modify gameplay features by giving them limited access to your scripting platform. For example, look at Binding of Isaac.

Finally, being able to refresh your code at a press of a button during run-time is really really neat.

Why should I not use a scripting language?

Debugging for scripting languages is a big pain in the ass, unless you are going to make an IDE for your scripting language. It is sadly not as easy to debug as compared to using a host language (like c++), which have so many fancy tools (visual studio, etc.)

The major turn-off for most will be the performance. It is a main issue that scripting languages will always be slower compared to it’s source code equivalent. If speed is a critical must, then it’s better to run everything on the main source code.

Some prerequisites before we start.

Sol2 Lua Binding Library for C++

Sol2 is a C++ library binding to Lua. It is really easy to set up, and easy to use.

There are plenty of tutorials out there on the github page. If you would like to know more, I would recommend you to go to the github page and follow the tutorials there for more grasp on the topic. There are plenty of great tutorials there on how to use the library.

Here’s the link!