Controlling lifetime of Lua references

[nimble0]

I'm looking for a way to invalidate Lua references so I can match their lifetimes to the CPP object they point to.

It looks like manually setting the metatable to nil is one option:

{
	Test test;
	test.a = 54;

	lua["test"] = &test;
	sol::userdata testRef = lua["test"];

	lua.script(R"(
		print(test, test.a)
	)");

	testRef[sol::metatable_key] = sol::nil;
}

// script error instead of dereferencing a dangling pointer
lua.script(R"(
	print(test, test.a)
)");

Are there any problems with doing this? Is there a better way?

[Rochet2]

You may be interested in this issue as well #1367