Can't save LuaFunction about mlua HOT 4 CLOSED

UserData needs 'static due to TypeId::of::<T> requirements.
TypeId is used for generating and attaching shared metatable to UserData.

As an alternative, you could use Scope::create_nonstatic_userdata, it does not have 'static requirements and as a tradeoff uses unique metatable per instance (which is less efficient).

from mlua.

let uart = lua.scope(|scope| {
    scope.create_nonstatic_userdata(Uart {
        on_message: lua.create_function(|_, msg: String| Ok(()))?,
    })
})?;

pub fn scope<'lua, 'scope, R, F>(&'lua self, f: F) -> Result<R>
where
    'lua: 'scope,
    R: 'static,
    F: FnOnce<(&Scope<'lua, 'scope>,), Output = Result<R>>,

Oh no, Result<R>> require 'static.

from mlua.

This is how Scope works - it drops scoped objects on function leave.

1. You could place logic inside Scope
2. Or alternatively store Lua objects in Registry using Lua::create_registry_value and keep RegistryKey which is 'static
   You can retrieve values back using Lua::registry_value

from mlua.

thanks, it's perfect

from mlua.