Function main

examples/source/unique_ptr.cpp:46–101

};

int main() {

	std::cout << "=== unique_ptr support ===" << std::endl;

	sol::state lua;
	lua.new_usertype<my_type>(
	     "my_type", "value", &my_type::value);
	{
		std::unique_ptr<my_type> unique
		     = std::make_unique<my_type>();
		lua["unique"] = std::move(unique);
	}
	{
		std::cout << "getting reference to unique_ptr..."
		          << std::endl;
		std::unique_ptr<my_type>& ref_to_unique_ptr
		     = lua["unique"];
		my_type& ref_to_my_type = lua["unique"];
		my_type* ptr_to_my_type = lua["unique"];

		SOL_ASSERT(
		     ptr_to_my_type == ref_to_unique_ptr.get());
		SOL_ASSERT(
		     &ref_to_my_type == ref_to_unique_ptr.get());
		SOL_ASSERT(ref_to_unique_ptr->value == 10);

		// script affects all of them equally
		lua.script("unique.value = 20");

		SOL_ASSERT(ptr_to_my_type->value == 20);
		SOL_ASSERT(ref_to_my_type.value == 20);
		SOL_ASSERT(ref_to_unique_ptr->value == 20);
	}
	{
		std::cout << "getting copy of unique_ptr..."
		          << std::endl;
		my_type copy_of_value = lua["unique"];

		SOL_ASSERT(copy_of_value.value == 20);

		// script still affects pointer, but does not affect
		// copy of `my_type`
		lua.script("unique.value = 30");

		SOL_ASSERT(copy_of_value.value == 20);
	}
	// set to nil and collect garbage to destroy it
	lua.script("unique = nil");
	lua.collect_garbage();
	lua.collect_garbage();

	std::cout << "garbage has been collected" << std::endl;
	std::cout << std::endl;

	return 0;
}