Programming Game AI by Example

Accessing a Lua Function from within C++

Using a similar process to that used in the last two sections, you can allow

your C/C++ program to access Lua functions. Let’s use the simple function

add as an example:

--function to add two numbers together and return the result

function add(a, b)

return (a + b)

end;

A Lua function is a type just like a number, string,ortable, so the process

for accessing one is familiar. First, place the function on the stack and

make sure what’s there is what you are expecting.

//get the function from the global table and push it on the stack

lua_getglobal(pL, "add");

//check that it is there

if (!lua_isfunction(pL, -1))

{

cout