Scoping classes created in Lua using Luabind

I am aware that Lua classes can be created using the OO system that Luabind exposes to Lua:

http://www.rasterbar.com/products/luabind/docs.html#defining-classes-in-lua

class 'lua_testclass'

function lua_testclass:__init(name)
    self.name = name
end

function lua_testclass:print()
    print(self.name)
end

a = lua_testclass('example')
a:print()

However I am unable to figure out how to scope the class within another namespace so I can do the following:

a = MyScope.lua_testclass('example')
a:print()

Anyone has a idea. I do not want my classes to pollute the global namespace in Lua.

Luabind's class function will always pollute the global table. However, you can clean up after it:

function newclass(name)
    oldglobal = _G[name]
    class(name)
    cls = _G[name]
    _G[name] = oldglobal
    return cls
end

Then you would use it like this:

MyScope.lua_testclass = newclass 'lua_testclass'

Analogous to local mod = require 'mod' you have to spell the name of the class twice, but you could easily build another function on top of this that could be used like setclass(MyScope, 'lua_testclass'), automatically putting the class into MyScope:

function setclass(scope, name) scope[name] = newclass(name) end

Disclaimer: All this code is entirely untested.