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MichaelCrook

Is there an ACTUAL luabind tutorial

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Ive spent... countless.. COUNTLESS, hours attempting to learn luabind.. but there is Nothing out there... and if there is it is a minute amount of information...

What I would really kill for is a working example I could pick apart and make work for my needs.

What I am trying to do is expose a class so that I can call a function inside of it, passing an int and a string... My issue is that I have to pass in two maps to the creation of the class.. So I pretty much need to be able to pass in objects... but when ever I use luabind::gobals() I get exception problems :(

So what I wanted to know.. Is there any resource out there which will help me learn how to expose a class and pass objects to it.
(hmm, I mean pass object references, as I need to be able to access the data in them after the exposed class has modified them)

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I'm assuming the documentation isn't sufficient?


Not really... I am slowly getting a hold of it, but without other teams at my uni I wouldn't be able to do it.. the biggest thing I needed, luabind::globals has almost no info on it in the documentation, If I get to fully understand it I might make a guide (after this semester)

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The docs says luabind::globals() returns the global environment table, which is a luabind::object. Section 11 of the docs gives you a synopsis of luabind::object's interface. Is there anything else you need?

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for instance... I cannot find a way in hell to fix this error:

CompCompiler.cpp
1>g:\crsm-svn\luatesting\externallibraries\include\luabind\detail\call.hpp(293): error C2027: use of undefined type 'lua_State'
1> g:\crsm-svn\luatesting\externallibraries\include\lua.h(50) : see declaration of 'lua_State'
1> g:\crsm-svn\luatesting\externallibraries\include\luabind\detail\call.hpp(89) : see reference to function template instantiation 'int luabind::detail::invoke_normal<F,boost::mpl::vector3<T0,T1,T2>,Policies>(lua_State *,const luabind::detail::function_object &,luabind::detail::invoke_context &,const F &,Signature,const Policies &,boost::mpl::long_<N>,boost::mpl::true_)' being compiled
1> with
1> [
1> F=luabind::detail::construct<construct_type,pointer,signature>,
1> T0=void,
1> T1=const luabind::adl::argument &,
1> T2=lua_State,
1> Policies=luabind::detail::null_type,
1> Signature=boost::mpl::vector3<void,const luabind::adl::argument &,lua_State>,
1> N=2
1> ]
.........
........


which is being caused by this class:
header:
#pragma once

#include <lua.hpp>
#include <luabind/luabind.hpp>

class CompCompiler
{
public:
CompCompiler();
~CompCompiler();
void setSomeData(int dataz);
void setMoreData(bool statezzz);
int getSomeData(){return(someData);};
bool getMoreData(){return(moreData);};
void setupLuaBinds(lua_State *L);
private:
int someData;
bool moreData;
};

implementation:
#include "CompCompiler.h"

CompCompiler::CompCompiler()
{
someData = 2;

moreData = true;
}

void CompCompiler::setupLuaBinds(lua_State *L)
{
luaL_openlibs(L);
luabind::open(L);

luabind::module(L)
[
luabind::class_<CompCompiler>("CompCompiler")
.def(luabind::constructor<lua_State>())
.def("setSomeData",&CompCompiler::setSomeData)
.def("setMoreData", &CompCompiler::setMoreData)
.def("getSomeData", &CompCompiler::getSomeData)
.def("getMoreData", &CompCompiler::getMoreData)
];

lua_close(L);
}


CompCompiler::~CompCompiler()
{
}


Now, the reason why I am getting this error is probably something trivial.. but as I have no knowledge in luabind I am hitting a brick wall.

I thought, hey maybe it's because inside of a constructor lua_state is unacceptable for some stupid reason, bummer, now my neat idea ain't gonna be as need as I wanted it to be, but when I changed my code (to what you see there) so that lua_state wasn't in the compiler, it was in a fully compiled class, it still gets the error -.-
so apparently atm luabind is angry at me for passing a lua_state... can you even pass a lua_state?

So I am stuck at a brick wall... I am trying to keep my LuaInstances class as abstract as possible (i.e. all it does is hold and distribute the states, the classes using them initiate their part in a given instance (yes I know, if I wanted to be fully abstract I would make a separate class for initiating the class being binded to luabind, but I can't be bothered) can you not do this?

I am trying to make it so that there are multiple instances of lua_state so that I can keep my lua states COMPLETLY seperate so that when who ever is writing the scripts, is writing the scripts, they only have access to a portion of the functions in my code for a given task.. I don't want somone who is changing key bindings having access to entity management -.-.. I considered namespaces, but people would (to the best of my knowledge) be able to access the functions/globals I don't want them having access to.

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btw, if anyone wants to try to help me, I get these more easy to read errors:


Error 1 error C2027: use of undefined type 'lua_State' g:\crsm-svn\luatesting\externallibraries\include\luabind\detail\call.hpp 293

Error 2 error C2664: 'void luabind::detail::construct_aux<Arity,T,Pointer,Signature>::operator ()(const luabind::adl::argument &,lua_State) const' : cannot convert parameter 2 from 'a1' to 'lua_State' g:\crsm-svn\luatesting\externallibraries\include\luabind\detail\call.hpp 294

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ive build a working program using these libraries before, I will though look at my other version which isn't statically linked

edit:

nope, that wasn't the problem, and both of these builds have worked in different situations

edit:
I think I know the problem, it is a static class, therefore accessing it's includes might cause derp

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turns out error is hear:
luabind::module(L)
[
luabind::class_<CompCompiler>("CompCompiler")
.def(luabind::constructor<lua_State>())
.def("setSomeData",&CompCompiler::setSomeData)
.def("setMoreData", &CompCompiler::setMoreData)
.def("getSomeData", &CompCompiler::getSomeData)
.def("getMoreData", &CompCompiler::getMoreData)
];



.def(luabind::constructor<lua_State>())


originally the constructor TRIED to accept a lua_state in the constructor, I changed. sigh... the error message didn't help me at all

edit:
lol one problem fixed, another pop's its head up

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seriously.. anybody out there with ANY knowledge of luabind PLEASE PLEASE help... I have no idea how it works and now I'm getting errors which are either me getting pissed off or luabind being a peice of *(@T... I have 2 lua states being held in a map... I used .find(instEnum)->second to access them.. but when ever I pass this back through a function it causes access violations


First-chance exception at 0x0009facd in LuaInstances.exe: 0xC0000005: Access violation reading location 0xfeeeff32.
Unhandled exception at 0x77df15ee in LuaInstances.exe: 0xC0000005: Access violation reading location 0xfeeeff32.


I know its probably somthing so soo simple.. but I am dead.. luabind is making me want to murder ducklings

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