Add luabind support

[Xottab-DUTY]

Official repository:
https://github.com/luabind/luabind

Forks:
https://github.com/rpavlik/luabind
https://github.com/OpenXRay/luabind-deboostified/

Documentation:
https://github.com/luabind/luabind/wiki/Docs#implementation-notes

The classes and objects are implemented as user data in Lua. To make sure that the user data really is the internal structure it is supposed to be, we tag their metatables. A user data who's metatable contains a boolean member named __luabind_classrep is expected to be a class exported by luabind. A user data who's metatable contains a boolean member named __luabind_class is expected to be an instantiation of a luabind class.

This means that if you make your own user data and tags its metatable with the exact same names, you can very easily fool luabind and crash the application.

In the Lua registry, luabind keeps an entry called __luabind_classes. It should not be removed or overwritten.

[WheretIB]

Can you tell which specific part doesn't work or can be improved right now?
Is script load not detected at all or do you just want to be able to explore these userdata object contents?

[Xottab-DUTY]

Yes, the second! It will be awesome to see the userdata contents.
Currently, even if you assign a variable like this

function my_class:my_function()
    self.x = 0
end

you won't see the x in locals, because x belongs to the luabind's class and it is implemented using metatables.

[WheretIB]

How compatible is luabind-deboostified with luabind?
I've tried the original and don't like the boost setup, but I'm worried that the custom version support will not help people who use the boost version.

[Xottab-DUTY]

I didn't find any functional difference in src/*.cpp, except some changes in weak_ref.cpp, but it's really hard to analyze public headers, because almost all of them were rewritten.

[Xottab-DUTY]

@WheretIB, was there any progress or decisions made?

[brinkqiang]

@Xottab-DUTY
luabind is deprecated, sol2 outperforms the library in every way.
I wrote an automated bind library based on sol2. You can take a look if you are interested.
https://github.com/brinkqiang/dmsolpp

[Xottab-DUTY]

@Xottab-DUTY luabind is deprecated, sol2 outperforms the library in every way. I wrote an automated bind library based on sol2. You can take a look if you are interested. brinkqiang/dmsolpp

It doesn't outperform in every way. It doesn't support classes like luabind does. (luabind even support virtual functions that can be declared in C++ and overridden in Lua!)
And we are stuck with the legacy Lua scripts that use luabind classes and which we cannot change. So, thank you, but no.

[brinkqiang]

@Xottab-DUTY Xottab-DUTY
luabind even support virtual functions that can be declared in C++ and overridden in Lua.

    module.new_usertype<CCreature>(
        "CCreature"
        , sol::constructors<CCreature()>()
        , sol::meta_function::garbage_collect, sol::destructor([](CCreature& temp) { temp.~CCreature(); })
        , sol::base_classes, sol::bases<CObject>()
        , "SetHP", sol::make_reference<sol::function>(lua.lua_state(), &CCreature::SetHP)
        , "SetMP", sol::make_reference<sol::function>(lua.lua_state(), &CCreature::SetMP)
        , "GetHP", sol::make_reference<sol::function>(lua.lua_state(), &CCreature::GetHP)
        , "GetMP", sol::make_reference<sol::function>(lua.lua_state(), &CCreature::GetMP)
        
        );

use sol::make_referencesol::function

[ForserX]

+1