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POdeadline_timer callback called on a deleted object
 

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    <p>In the flowing code, even though I inherit net class from boost::enable_shared_from_this, when net get deleted,OnTimer still get called on a invalid object one more time.How to solve this problem? Thanks in advance.</p> <pre><code>boost::shared_ptr&lt;boost::asio::io_service&gt; service = boost::make_shared&lt;boost::asio::io_service&gt;(); class net:public boost::enable_shared_from_this&lt;net&gt; { public: net(boost::shared_ptr&lt;boost::asio::io_service&gt;&amp; service); void StartTimer(); void OnTimer(const boost::system::error_code&amp; e); ~net(); private: boost::asio::deadline_timer timer_; int a; }; net::net(boost::shared_ptr&lt;boost::asio::io_service&gt;&amp; service) :timer_(*service, boost::posix_time::milliseconds(1000)) { } net::~net() { timer_.cancel(); } void net::StartTimer() { timer_.async_wait(boost::bind(&amp;net::OnTimer, shared_from_this(), boost::asio::placeholders::error)); } void net::OnTimer(const boost::system::error_code&amp; e) { a = 10; timer_.async_wait(boost::bind(&amp;net::OnTimer, shared_from_this(), boost::asio::placeholders::error)); } unsigned int WINAPI ThreadMain(void* arg) { boost::shared_ptr&lt;net&gt; ptr(new net(service)); ptr-&gt;StartTimer(); Sleep(5000); boost::shared_ptr&lt;net&gt; invalid_ptr; ptr = invalid_ptr; return 0; } int _tmain(int argc, _TCHAR* argv[]) { boost::shared_ptr&lt;boost::asio::io_service::work&gt; io_service_work = boost::make_shared&lt;boost::asio::io_service::work&gt;(*service); boost::system::error_code ec; HANDLE hThread = (HANDLE)_beginthreadex(NULL, 0, ThreadMain, NULL, 0, NULL); if (hThread == NULL) { return -1; } boost::shared_ptr&lt;boost::thread&gt; thread_ = boost::make_shared&lt;boost::thread&gt;(boost::bind(&amp;boost::asio::io_service::run, service.get(), ec)); // in order to make sure OnTimer can be called at least once Sleep(2000); boost::shared_ptr&lt;boost::asio::io_service::work&gt; invalid_ptr; io_service_work = invalid_ptr; thread_-&gt;join(); WaitForSingleObject(hThread, INFINITE); CloseHandle(hThread); return 0; } </code></pre>
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