Lua package containing subpackages

Question

I wrote several modules for Lua in C. Each of them contains a Lua useridata datatype and I load and use them like this:

A = require("A")
B = require("B")
a = A.new(3,{1,2,3})
b1 = B.new(1)
b2 = B.new(2) * b1

Now I would like to put both types of user data into one shared library AandB

that can be used like

AB = require("AandB")
AB.A.new(3,{1,2,3})

What's a good way to achieve this? Right now my functions luaopen_*

look like this:

int luaopen_A(lua_State *L) {
  luaL_newmetatable(L, A_MT);
  luaL_setfuncs(L, A_methods, 0);

  luaL_newlib(L, A_functions);

  return 1;
};

And is it possible then to load only a part, for example. for example A = require("AandB.A")

:?

+3

1k5 04 dec. 14 at 21:08

2 answers

lhf · Answer 1 · 2014-12-05T01:30:13+0000

require("AandB.A")

works if you define luaopen_AandB_A

in your C library which one needs to be called AandB.so

.

Generally require

replaces periods with underscores when trying C libraries.

greatwolf · Answer 2 · 2014-12-04T23:08:08+0000

One thing you can do is to write a module lua script, which will pull both A

and B

. Then you can require the script from your used code:

-- AandB.lua
return { A = require 'A', B = require 'B' }

If you want to load part of your module, you can simply do:

A = require "AandB".A