Function main

examples/source/shared_ptr.cpp:46–120

};

int main() {

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

	sol::state lua;
	lua.new_usertype<my_type>(
	     "my_type", "value", &my_type::value);
	{
		std::shared_ptr<my_type> shared
		     = std::make_shared<my_type>();
		lua["shared"] = std::move(shared);
	}
	{
		std::cout << "getting reference to shared_ptr..."
		          << std::endl;
		std::shared_ptr<my_type>& ref_to_shared_ptr
		     = lua["shared"];
		std::cout << "\tshared.use_count(): "
		          << ref_to_shared_ptr.use_count()
		          << std::endl;
		my_type& ref_to_my_type = lua["shared"];
		std::cout << "\tafter getting reference to my_type: "
		          << ref_to_shared_ptr.use_count()
		          << std::endl;
		my_type* ptr_to_my_type = lua["shared"];
		std::cout << "\tafter getting pointer to my_type: "
		          << ref_to_shared_ptr.use_count()
		          << std::endl;

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

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

		SOL_ASSERT(ptr_to_my_type->value == 20);
		SOL_ASSERT(ref_to_my_type.value == 20);
		SOL_ASSERT(ref_to_shared_ptr->value == 20);
	}
	{
		std::cout << "getting copy of shared_ptr..."
		          << std::endl;
		std::shared_ptr<my_type> copy_of_shared_ptr
		     = lua["shared"];
		std::cout << "\tshared.use_count(): "
		          << copy_of_shared_ptr.use_count()
		          << std::endl;
		my_type copy_of_value = lua["shared"];
		std::cout << "\tafter getting value copy of my_type: "
		          << copy_of_shared_ptr.use_count()
		          << std::endl;

		SOL_ASSERT(copy_of_shared_ptr->value == 20);
		SOL_ASSERT(copy_of_value.value == 20);