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Why doesn't this work:

_socket = tcp::socket(ioService);

1) Socket has no default constructor. You have to pass ioService to its constructor. 2) socket it not copiable/assignable.

I tied _socket(ioService), still no luck....

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Also, is there any way to define a timeout on a synchronous connect()?

No.

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If not, what's the workaround?

You can write your own sync. connect with timeout, using async_connect, like this: http://lists.boost.org/Archives/boost/2007/04/120339.php

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Can I do an async connect and then somehow return to synchronous mode of operation?

Sure, you can mix sync and async approaches.

Thanks - will try this out.

On Thu, Feb 18, 2010 at 8:59 AM, Jonathan Franklin wrote:

On Thu, Feb 18, 2010 at 8:49 AM, David Kaplan wrote:

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I tied _socket(ioService), still no luck....

This is presumably a member variable, so you must do it in the constructor initializer list.  I have written many classes that have an asio::socket member variable, so I know it works.

Note that if you need to delay the creation of the socket, you might consider using a smart pointer to a socket. Jon

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Note that if you need to delay the creation of the socket, you might consider using a smart pointer to a socket.

This should solve the issue - thanks! Will try it out...

Besides, you can define io_service as a member of you class, and pass it to asio objects: class my_class { my_class() : sock_(io_) {} private: // io_ must be declared *before* any other asio objects, which are going to be initialized with it! io_service io_; tcp::socket sock_; }; Note, however, that both io_ and sock_ are non-copyable.

I tied _socket(ioService), still no luck....

You have to initialize _socket this way in your object constructor initialization list: class YourClass { YourClass(io_service &io) : _socket(io) {} tcp::socket _socket; };