Method parse_using

sources/instance/instance.cpp:319–333

	}

	void instance_type::parse_using(tree_type<token_base *>::iterator it, bool override)
	{
		if (it.data()->get_type() == token_types::parallel) {
			auto &parallel_list = static_cast<token_parallel *>(it.data())->get_parallel();
			for (auto &t : parallel_list)
				parse_using(t.root());
		}
		else {
			var ns = context->instance->parse_expr(it, true);
			if (ns.is_type_of<namespace_t>())
				context->instance->storage.involve_domain(ns.const_val<namespace_t>()->get_domain(), override);
			else
				throw runtime_error("Only support involve namespace.");
		}
	}

	repl::repl(context_t c) : context(std::move(c))
	{