On Wed, Aug 26, 2009 at 11:29 AM, Robert Dailey wrote:

Hello, I have a class called ByteSink that has a move constructor and move assignment operator. I pass an object of type ByteSink into bood::bind() by-value and it fails to compile. First, here is my call to boost::bind():

void SerialClient::Write( ByteSink data ) { m_service.post( boost::bind( &SerialClient::DoWrite, this, data ) ); }

The error message I'm getting will be located at the very bottom of this message to prevent clutter. Note that I am compiling on MSVC9 under Windows. Below is what my move constructor/assignment function prototypes look like for ByteSink:

/// Uses move semantics. ByteSink( ByteSink& other );

/// Uses move semantics. ByteSink& operator= ( ByteSink& other );

And the compiler error I'm getting (It's a bit lengthy) is below. Any idea what is causing this? My best guess is that boost::bind() is using const somewhere, and it cannot find a copy constructor that takes a const ByteSink as a parameter, since I'm not using a typical copy constructor.

1>C:\IT\third_party\boost_1_40_0_beta1\boost/bind/bind.hpp(859) : error C2558: class 'boost::_bi::list2' : no copy constructor available or copy constructor is declared 'explicit' 1> with 1> [ 1> A1=boost::_bi::value, 1> A2=boost::_bi::value<ByteSink> 1> ] 1> C:\IT\third_party\boost_1_40_0_beta1\boost/bind/bind.hpp(859) : while compiling class template member function 'boost::_bi::bind_t::bind_t(F,const L &)' 1> with 1> [ 1> R=void, 1> F=boost::_mfi::mf1, 1> L=boost::_bi::list2,boost::_bi::value<ByteSink>> 1> ] 1> ..\SerialClient.cpp(32) : see reference to class template instantiation 'boost::_bi::bind_t' being compiled 1> with 1> [ 1> R=void, 1> F=boost::_mfi::mf1, 1> L=boost::_bi::list2,boost::_bi::value<ByteSink>> 1> ]

I just verified that boost::bind() requires ByteSink to have a constructor of the form: ByteSink( ByteSink const& ) And it will not accept: ByteSink( ByteSink& )