How to access nested Lua tables from C

Question

Let's say I want to set a value (e.g. a function) inside a nested table from the Lua C API.

-- lua.lua
glob = { 
  nest = { 
    -- set value in here
  }
}

How would I have to set the stack to access the inner table?

Is it just calling gettable multiple times and then a settop, like in the following code?

lua_pushstring(state, "glob");
lua_gettable(state, -1);
lua_pushstring(state, "nest");
lua_gettable(state, -1);

lua_pushcclosure(state, &func, 0);
lua_settop(state, "funkyfunc");

lua_pop(state, 2);

What do you intend to do with lua_settop(state, "funkyfunc") ? — lhf
– lhf, Commented Apr 28, 2014 at 23:57

lhf · Accepted Answer · 2014-05-01 11:59:30Z

1

This code sets glob.nest.name to a C function:

lua_getglobal(state, "glob");
lua_getfield(state, -1, "nest");
lua_pushcclosure(state, &func, 0);
lua_setfield(state, -1, "name");

To add others field to glob.nest, just keep going:

...
lua_pushcclosure(state, &anotherfunc, 0);
lua_setfield(state, -1, "anothername");

edited May 1, 2014 at 11:59

answered Apr 28, 2014 at 23:56

lhf

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