std::shared_ptr MqttClient::NewConnection()

in source/mqtt/MqttClient.cpp [729:762]
29 lines of code
3 McCabe index (conditional complexity)

            std::shared_ptr<MqttConnection> MqttClient::NewConnection(
                const char *hostName,
                uint16_t port,
                const Io::SocketOptions &socketOptions,
                const Crt::Io::TlsContext &tlsContext,
                bool useWebsocket) noexcept
            {
                if (!tlsContext)
                {
                    AWS_LOGF_ERROR(
                        AWS_LS_MQTT_CLIENT,
                        "id=%p Trying to call MqttClient::NewConnection using an invalid TlsContext.",
                        (void *)m_client);
                    aws_raise_error(AWS_ERROR_INVALID_ARGUMENT);
                    return nullptr;
                }

                // If you're reading this and asking.... why is this so complicated? Why not use make_shared
                // or allocate_shared? Well, MqttConnection constructors are private and stl is dumb like that.
                // so, we do it manually.
                Allocator *allocator = m_client->allocator;
                MqttConnection *toSeat =
                    reinterpret_cast<MqttConnection *>(aws_mem_acquire(allocator, sizeof(MqttConnection)));
                if (!toSeat)
                {
                    return nullptr;
                }

                toSeat = new (toSeat) MqttConnection(m_client, hostName, port, socketOptions, tlsContext, useWebsocket);
                return std::shared_ptr<MqttConnection>(toSeat, [allocator](MqttConnection *connection) {
                    connection->~MqttConnection();
                    aws_mem_release(allocator, reinterpret_cast<void *>(connection));
                });
            }