Re: property setters not working

Following up my own issue...

I misunderstood the Luabind INSTALL instructions and so even though I built
Luabind correctly, I was not specifying LUABIND_DYNAMIC_LINK when compiling
my app.  The symptom was (to me) rather odd: when I trapped the check for
whether to use the property setter (ref. line 320 of class_rep.cpp where it
does this:

    if (lua_tocfunction(L, -1) == &property_tag) ...

), I found that the two sides were not equal, even though &property_tag is
what was originally pushed on the stack:

    Left side: 0x00411db1 luabind::detail::property_tag(struct lua_State *)
int (lua_State *)*
    Right side: 0x001a2690 luabind::detail::property_tag(lua_State *)	int
(lua_State *)*

Adding LUABIND_DYNAMIC_LINK fixes the problem but introduces a very ugly set
of compile warnings:

Warning	1	warning C4251: 'luabind::detail::class_registry::m_classes' :
class 'std::map<_Kty,_Ty,_Pr>' needs to have dll-interface to be used by
clients of struct 'luabind::detail::class_registry'
c:\saved_software\luabind-0.8.1\luabind\detail\class_registry.hpp	70	
Warning	2	warning C4251: 'luabind::detail::object_rep::m_lua_table_ref' :
struct 'luabind::detail::lua_reference' needs to have dll-interface to be
used by clients of class 'luabind::detail::object_rep'
c:\saved_software\luabind-0.8.1\luabind\detail\object_rep.hpp	79	
Warning	3	warning C4251: 'luabind::detail::object_rep::m_dependency_ref' :
struct 'luabind::detail::lua_reference' needs to have dll-interface to be
used by clients of class 'luabind::detail::object_rep'
c:\saved_software\luabind-0.8.1\luabind\detail\object_rep.hpp	82	
Warning	4	warning C4251: 'luabind::detail::class_rep::m_bases' : class
'std::vector<_Ty>' needs to have dll-interface to be used by clients of
class 'luabind::detail::class_rep'
c:\saved_software\luabind-0.8.1\luabind\detail\class_rep.hpp	327	
Warning	5	warning C4251: 'luabind::detail::class_rep::m_self_ref' : struct
'luabind::detail::lua_reference' needs to have dll-interface to be used by
clients of class 'luabind::detail::class_rep'
c:\saved_software\luabind-0.8.1\luabind\detail\class_rep.hpp	340	
Warning	6	warning C4251: 'luabind::detail::class_rep::m_table' : class
'luabind::handle' needs to have dll-interface to be used by clients of class
'luabind::detail::class_rep'
c:\saved_software\luabind-0.8.1\luabind\detail\class_rep.hpp	347	
Warning	7	warning C4251: 'luabind::detail::class_rep::m_default_table' :
class 'luabind::handle' needs to have dll-interface to be used by clients of
class 'luabind::detail::class_rep'
c:\saved_software\luabind-0.8.1\luabind\detail\class_rep.hpp	351	
Warning	8	warning C4251: 'luabind::detail::class_rep::m_getters' : class
'std::map<_Kty,_Ty,_Pr>' needs to have dll-interface to be used by clients
of class 'luabind::detail::class_rep'
c:\saved_software\luabind-0.8.1\luabind\detail\class_rep.hpp	365	
Warning	9	warning C4251: 'luabind::detail::class_rep::m_setters' : class
'std::map<_Kty,_Ty,_Pr>' needs to have dll-interface to be used by clients
of class 'luabind::detail::class_rep'
c:\saved_software\luabind-0.8.1\luabind\detail\class_rep.hpp	366	
Warning	10	warning C4251: 'luabind::detail::class_rep::m_operators' : class
'std::vector<_Ty>' needs to have dll-interface to be used by clients of
class 'luabind::detail::class_rep'
c:\saved_software\luabind-0.8.1\luabind\detail\class_rep.hpp	368	
Warning	11	warning C4251: 'luabind::detail::class_rep::m_static_constants' :
class 'std::map<_Kty,_Ty,_Pr>' needs to have dll-interface to be used by
clients of class 'luabind::detail::class_rep'
c:\saved_software\luabind-0.8.1\luabind\detail\class_rep.hpp	373	

Anyone know how to avoid those?

Thanks again,
Sean



seanmhogan wrote:
> 
> Hi.  I'm having a devil of a time binding to a class property and then
> setting that property from Lua.  I'm using Lua 5.1, Luabind 0.8.1, Boost
> 1.39 and Visual Studio 2005.
> 
> The C++ code:
> 
> struct Tough
> {
>     Tough(){}
>     ~Tough(){}
> 
>     int Tough::get_i() const { return i; }
>     void Tough::set_i(int _i) { i = _i; }
> 
>     int i;
> };
> 
> int main()
> {
>     lua_State* L = lua_open();
>     luaL_openlibs(L);
>     luabind::open(L);
> 
>     module(L) [
>         class_<Tough>("Tough")
>             .def(constructor<>())
>             .property("i", &Tough::get_i, &Tough::set_i)
>     ];
> 
>     luaL_dofile(L, "test.lua");
>     object tough1 = globals(L)["tough1"];
>     Tough* ptough = object_cast<Tough*>(tough1);
>     printf("i=%d\n", ptough->get_i());
> }
> 
> test.lua contains simply:
> 
>     tough1 = Tough()
>     tough1.i = 8
> 
> The Tough::set_i() method is never called and stough->i is left as
> -842150451 (uninitialized).  Am I missing something obvious here?
> 
> Thanks,
> Sean
> ---
> Sean Hogan
> Marport Canada
> [email protected]
> 

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