Re: return_stl_iterator acting as const?

If I remember correctly... use boost::ref() on the variables in your call to function_call:

 

function_call(boost::ref(myVar));
 


Date: Mon, 2 Mar 2009 01:09:27 -0800
From: [email protected]
To: [email protected]
Subject: [luabind] return_stl_iterator acting as const?

Greetings all,

I'm having a problem setting the value of a class contained within a std::vector from lua, I have the following code:

C++:
class ContainedObject
{
public:
    int value;
};

class ContainerObject
{
public:
    std::vector<ContainedObject> vec;
    int containervalue;
};


luabind::module(L)
[
    luabind::class<ContainedObject>("ContainedObject")
    .def(luabind::constructor<>())
    .def_readwrite("value", &ContainedObject::value),

    luabind::class_<ContainerObject>("ContainerObject")
    .def_readwrite("containervalue",    &ContainerObject::containervalue)
    .def_readwrite("vec",            &ContainerObject::vec, luabind::return_stl_iterator)
];

ContainerObject cont;
ContainedObject Obj;

Obj.value = 10;

cont.push_back(Obj);
cont.containervalue = 15;

luabind::call_function<void>(L, "LuaFunction", &cont);

std::cout << cont.containervalue << std::endl;
std::cout << cont.vec[0].value << std::endl;



Lua code:
function LuaFunction( cont )
    print (cont.containervalue)
    cont.containervalue = 30
    for things in cont.vec
    do
        print (things.value)
        things.vlaue = 5
    end
end


Which prints out:
15
10
30
10
So I am able to modify the containervalue of ContainerObject, but I am not able to modify the ContainedObject value.  Any thoughts here?  Is luabind making a copy of the vector as it passes it off?  If so is there a by reference way possible?

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