Implementing a Lua executor

We will implement a reusable C++ Lua executor class step by step. Let us call it LuaExecutor. We will continue to improve this executor by adding new functions to it.

How to include the Lua library in C++ code

To work with the Lua library, you only need three header files:

• lua.h for core functions. Everything here has a lua_ prefix.
• lauxlib.h for the auxiliary library (auxlib). The auxiliary library provides more helper functions built on top of the core functions in lua.h. Everything here has a luaL_ prefix.
• lualib.h for loading and building Lua libraries. For example, the luaL_openlibs function opens all standard libraries.

Lua is implemented in C and those three header files are C header files. To work with C++, Lua provides a convenient wrapper, lua.hpp, whose content is as follows:

extern "C" {
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
}

In your C++ code, lua...