How to pass Lua Closures into C++ Functions in Sol3 ?

[theanimatorspal]

This is inside a new_usertype

        "SetDrawCallback",
        [](Jkr::WindowMulT& inWindow, sol::function& inFunction) {
            inWindow.SetDrawCallBack([&inFunction](void*) { inFunction(); });
        },

but it isn't working. I also tried setting sol::function instead of sol::function&, it compiled but gave runtime error in lua_gettop() function.

[skaarj1989]

Have you tried capturing inFunction by value? maybe it's a lifetime issue?

[theanimatorspal]

Yup. " I also tried setting sol::function instead of sol::function&," I said.

[skaarj1989]

I also tried setting sol::function instead of sol::function&,

This means that you have a temporary argument sol::function inFunction and then you capture that temporary argument by reference in the next lambda (inWindow.SetDrawCallBack).

[theanimatorspal]

Ah man, thank You.