Re: 0.9 VS2008 link error + strange 'attempt to call nil' issue

Cheers mate, this actually fixed both of my issues. Obviously the nil call
when using properties was being caused by some strange linkage issue.
Everything seems to be working great now after defining LUABIND_DYNAMIC_LINK
for my project.

Matt

2010/4/2 Mickaël SÉRÉGÉ <[email protected]>

> Hi,
>
> For your link problem, here is the solution : here<http://sourceforge.net/mailarchive/forum.php?thread_name=19F3E61F0A28414A84A43B0F370A2ABC0FA56AAD8E%40arcaWay.arcadiasoft.local&forum_name=luabind-user>
>
> --------------------------
> Mickaël SÉRÉGÉ
>
>
> 2010/4/2 Matt Holmes <[email protected]>
>
>> Hello,
>>
>> First off, let me say that these questions may have been answered, but try
>> as I might, I can't find a way to search the archive, so I can't tell. I've
>> looked back quite a few months in the archive and saw nothing like my
>> problem, so I decided to send in a question.
>>
>> First off, I build luabind from the 0.9 sources using bjam and MSVC9
>> (auto-detected by boost.build because I was in my VS2008 command line
>> environment). I built both the debug and release versions of the library.
>>
>> After putting a call_function call in to my code, I started to recieve the
>> following link error (when linking against the debug library):
>>
>> Error    1    error LNK2001: unresolved external symbol "private: static
>> unsigned int const luabind::detail::class_id_map::local_id_base"
>> (?local_id_base@class_id_map@detail@luabind@@0IB)    Engine.obj
>> Tachyon
>>
>> I was able to get around this with an absolute hack, which was to
>> instantiate the static variable in one of my compiler units, like so:
>>
>> unsigned int const luabind::detail::class_id_map::local_id_base =
>>     std::numeric_limits<unsigned int>::max() / 2;
>>
>> Again, this is a total hack and not something I like having in my code.
>>
>> Now I can compile, and I can run scripts, and I can even call globally
>> defined functions. If I try and do anything with an instance of a defined
>> class, even check it for nil, I get an 'attempt to call nil' error.
>>
>> That may seem somewhat confusing, but let me show you with code:
>>
>> Here is how I define the class:
>>     luabind::scope Actor::bind() {
>>         using namespace luabind;
>>         return class_<Actor>("Actor")
>>             .property("tag", &Actor::getTag)
>>             .property("name", &Actor::getName, &Actor::setName);
>>     }
>>
>>     luabind::scope ScriptingService::bindCoreApi() {
>>         using namespace luabind;
>>         return def ("log", &global_log);
>>     }
>>
>>     void ScriptingService::openContext(Scriptable* scriptable) {
>>         lua_State* state = lua_open();
>>         luaopen_base(state);
>>         luaopen_math(state);
>>         luaopen_string(state);
>>         luaopen_table(state);
>>
>>         luabind::open(state);
>>         scriptable->setState(state);
>>
>>         luabind::module(state) [
>>             bindCoreApi(),
>>             scriptable->bind()
>>         ];
>>     }
>>
>> In this case, Actor is a Scriptable, and is being passed in to
>> openContext. It's bind is correctly being called, and the class_ scope is
>> being returned.
>>
>> Now if I execute the following Lua on that lua_State:
>>
>> function testEvent(a)
>>     if a ~= nil
>>         log("A is not nil")
>>     else
>>         log("A is nil")
>>     end
>> end
>>
>> I will get an 'attempt to call nil' error, but if I do something like:
>>
>> function testEvent(a)
>>     log("Hello World")
>> end
>>
>> It works fine, so I know the log global function is registered and
>> working.
>>
>> I call the function like so:
>>
>> luabind::call_function<void>(_state, "testEvent", a);
>>
>> where a is a non-null Actor*.
>>
>> Is there something obviously wrong here? And if this has been answered
>> elsewhere, feel free to point me to that, and an archive search if one
>> exists.
>>
>>
>> ------------------------------------------------------------------------------
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>>
>>
>
>
> ------------------------------------------------------------------------------
> Download Intel&#174; Parallel Studio Eval
> Try the new software tools for yourself. Speed compiling, find bugs
> proactively, and fine-tune applications for parallel performance.
> See why Intel Parallel Studio got high marks during beta.
> http://p.sf.net/sfu/intel-sw-dev
> _______________________________________________
> luabind-user mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/luabind-user
>
>

------------------------------------------------------------------------------
Download Intel&#174; Parallel Studio Eval
Try the new software tools for yourself. Speed compiling, find bugs
proactively, and fine-tune applications for parallel performance.
See why Intel Parallel Studio got high marks during beta.
http://p.sf.net/sfu/intel-sw-dev

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