Lua Quick Start Guide

Calling C functions from Lua

All of the code that we have written so far has been about exposing C to Lua using Lua Bridge. Any C function exposed through Lua Bridge can be called from Lua. If a function is in a namespace and not a class, it is called with the dot syntax: Math.Sqrt(16). But, if a function is in a class, it needs to be called with the colon syntax: vector:Normalize(). The following code shows how to expose a C function to Lua and how to call it from Lua.

The C code needs to declare the appropriate vector 3 class, a Normalize member function, and a global dot product function. Next, the Register function exposes all of these functions to Lua, using Lua Bridge:

class Vec3 {  public:    float x, y, z;        float Normalize() { float dot ...