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

In this lua file, we can see definition of the function testLuaFunction1 as well as a call to run the actual function. Now let’s try running the Lua function from c code! Create a new lua file called ‘testLuaFunction2’ in your scripts folder with the following code snippet. Programming in Lua (first edition) contents errata code manual newer editions This is the online version of the first edition of the book Programming in Lua, a detailed and authoritative introduction to all aspects of Lua programming written by Lua's chief architect.

Now that we have everything set up, let’s start!

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Running a simple Lua-code from c++

First off, let’s try doing something simple. Let’s try running a Lua code from a string.

This should print out:

Hello World!

Congratulations! You have run your first Lua-code in c++! As you can see, you don’t really need all these fancy ‘.lua’ files to run Lua-code. You can just use strings for the trivial stuffs.

You might be wondering what the code snippet above is doing.

sol::state state;

This line creates a lua state to be used in the codebase. Any functions or variables you define would ‘live in’ the state that it’s created in.

How to download netflix movies on mac offline. state.open_libraries(sol::lib::base, sol::lib::package);

This line loads up the default libraries that gives you certain functionalities of the Lua language. This includes I/O and other important functionalities. For our test case, we load up these libraries in order to run Lua’s print function. https://karmayellow.weebly.com/blog/spotify-premium-free-apk-june-2019.

If you are intending to create a sandbox for your game, you might not want to load up these libraries as you would essentially be giving your players too much power. You wouldn’t really want to give your modders functionalities to access I/O as it could lead to a security risk.

state.do_string('print('Hello World!')');

This line would run the Lua code snippet from a string. As you might guess, looking at the code, this line would print “Hello World!” to the console window.

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Now let’s try running the same code snippet from a ‘.lua’ file.

In the default directory of your project, create a ‘scripts’ folder to store all your scripts.

Create a file ‘HelloWorld.lua’ in the script folder and add this code inside:

Now try running this code in c++:

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This should also print out:

Hello World!

state.do_file('scripts/HelloWorld.lua');

You might notice the slight change of code here. Instead of do_script, we used do_file, to indicate that we want to run the code from a ‘.lua’ file instead of a string.

Accessing Lua variables from c++

In this part of the tutorial, we will be covering on how to access lua variables in c++ code.

Accessing lua variables from c++ is fairly simple.

Here we have a numeric lua variable named ‘luaNum’. As you can see, in the snippet code above, we are able to both set and get the value just like a normal variable in c++ just by knowing the lua variable’s name.

If nothing goes wrong, you’ll see:

printing in Lua: 3
printing in c++: 3

state['luaNum'] = 3;

This line defines a numeric lua value with the variable name of “luaNum”. As stated above, every time you reference “luaNum” in your lua codebase, you would be referencing this variable. Facetune apk 2018 ios.

state.do_string(std::string('print('printing in Lua: ' . luaNum)');

This line prints the value of “luaNum”. This might be off topic but “.” is the concatenation operator for strings in lua.

Running c++ functions from Lua

We shall first try calling c++ functions from lua. Right now we’ll only run normal functions. We shall look at classes later in part 2 of the tutorial.

Since we already covered that whatever we can do in the ‘.lua’ files can also be done using strings, we shall just cover the topic using strings in order to simplify the tutorial.

Let’s run this code!

If you run this code correctly, you should print out:

Called testCppFunction with return value (1)!

lua.set_function('testCppFunction', testCppFunction);

This lines binds the c++ function into the Lua state with the alias “testCppFunction”

state.do_string('num = testCppFunction(1); print(': Called testCppFunction! Return value:' . num)');

This line calls the testCppFunction by calling “testCppFunction(1)” in the string.

You can also do this with functional objects, lambda, etc. Try it out!

Running Lua functions from c++

Before we do anything fancy like running the lua function from c++, let’s first run the code from a Lua file.

Create a Lua file called “testLuaFunction1.lua” in your scripts folder with the following code snippet:

If you did everything right, running this should print out “Calling testLuaFunction1!”.

In this lua file, we can see definition of the function testLuaFunction1 as well as a call to run the actual function.

Now let’s try

Lua C 17