Hi guys,
I'm relatively new to Luabind and have a problem with using a shared_ptr
created in C++ in Lua.
This is the C++ code reduced to a minimum:
struct Member {
Member( int x ) : m_x( x ) {}
int GetNum() { return m_x; }
int m_x;
};
template <class T>
struct Foobar {
typedef boost::shared_ptr<Foobar<T> > Ptr;
Foobar( const T& value ) : x( value ) {}
static Ptr Create( const T& value ) { return
boost::shared_ptr<Foobar<T> >( new Foobar<T>( value ) ); }
T& Get() { return x; }
const T& Get() const { return x; }
T x;
};
The binding looks like follows:
class_<Member>( "Member" )
.def( constructor<int>() )
.def( "GetNum", &Member::GetNum )
,
class_<Foobar<Member*> >( "Foobar" )
.def( "Get",
(Member*&(Foobar<Member*>::*)())&Foobar<Member*>::Get )
.scope [
def( "Create", (Foobar<Member*>::Ptr(*)( Member*
))&Foobar<Member*>::Create )
]
And the Lua code like that:
member = debug.Member( 123 )
property = debug.Foobar.Create( member )
get = property:Get()
print( get:GetNum() )
As soon as get:GetNum() is called, the program crashes. This is the
backtrace:
#0 0x00000000004ef1f6 in Member::GetNum (this=0x7b)
at /home/stefan/code/games/cell/engine/src/cell/LuaBindExport.cpp:22
#1 0x0000000000511da0 in luabind::detail::invoke_member<int
(Member::*)(), boost::mpl::vector2<int, Member&>,
luabind::detail::null_type> (L=0x9e8b60, self=..., ctx=...,
f=@0x9f5a90)
at /usr/include/luabind/detail/call.hpp:283
#2 0x0000000000507722 in luabind::detail::invoke0<int
(Member::*)(), boost::mpl::vector2<int, Member&>,
luabind::detail::null_type, boost::is_void<int> > (L=0x9e8b60,
self=..., ctx=..., f=@0x9f5a90,
policies=...) at /usr/include/luabind/detail/call.hpp:78
#3 0x00000000005064ab in luabind::detail::invoke<int
(Member::*)(), boost::mpl::vector2<int, Member&>,
luabind::detail::null_type> (L=0x9e8b60, self=..., ctx=...,
f=@0x9f5a90, policies=...)
at /usr/include/luabind/detail/call.hpp:101
#4 0x0000000000505158 in
luabind::detail::function_object_impl<int (Member::*)(),
boost::mpl::vector2<int, Member&>,
luabind::detail::null_type>::entry_point (L=0x9e8b60)
at /usr/include/luabind/make_function.hpp:63
#5 0x00007ffff7bc0a56 in ?? () from /usr/lib/liblua5.1.so.0
#6 0x00007ffff7bcb811 in ?? () from /usr/lib/liblua5.1.so.0
#7 0x00007ffff7bc0fc5 in ?? () from /usr/lib/liblua5.1.so.0
#8 0x00007ffff7bc0647 in ?? () from /usr/lib/liblua5.1.so.0
#9 0x00007ffff7bc06c5 in ?? () from /usr/lib/liblua5.1.so.0
#10 0x00007ffff7bbc114 in lua_pcall ()
from /usr/lib/liblua5.1.so.0
#11 0x00000000004e3d23 in
luabind::detail::proxy_function_void_caller<boost::tuples::tuple<boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type> >::~proxy_function_void_caller (this=0x7fffffff9830,
__in_chrg=<value optimized out>)
at /usr/include/luabind/detail/call_function.hpp:262
So basically when returning a newly created boost::shared_ptr, there
seems to go something wrong. After hours of debugging I just can't
figure out why it happens.
Greetings,
Stefan.
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