[Boost-users] [bind] Will not compile when passing parameter by-value

Subject: [Boost-users] [bind] Will not compile when passing parameter by-value
From: Robert Dailey (rcdailey_at_[hidden])
Date: 2009-08-26 12:29:22

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<A1,A2>' : no copy constructor available or
copy constructor is declared 'explicit'
1>        with
1>        [
1>            A1=boost::_bi::value<SerialClient *>,
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<R,F,L>::bind_t(F,const L &)'
1>        with
1>        [
1>            R=void,
1>            F=boost::_mfi::mf1<void,SerialClient,ByteSink>,
1>            L=boost::_bi::list2<boost::_bi::value<SerialClient
*>,boost::_bi::value<ByteSink>>
1>        ]
1>        ..\SerialClient.cpp(32) : see reference to class template
instantiation 'boost::_bi::bind_t<R,F,L>' being compiled
1>        with
1>        [
1>            R=void,
1>            F=boost::_mfi::mf1<void,SerialClient,ByteSink>,
1>            L=boost::_bi::list2<boost::_bi::value<SerialClient
*>,boost::_bi::value<ByteSink>>
1>        ]