Case 1: fail to parse std::unique_ptr
#include <memory>
std::unique_ptr<net::deadline_timer> m_timer;

Case 2: fail to parse OnMessageCB
#include "using_content.h"
OnMessageCB m_on_cb;

// file using_content.h
//
using OnMessageCB = std::function<void(long j)>;

Case 3> fail to parse boost type
const boost::posix_time::seconds m_timer{0};

Case 1: fail to parse std::unique_ptr
#include <memory>
std::unique_ptr<net::deadline_timer> m_timer;