[Boost-bugs] [Boost C++ Libraries] #2144: boost::thread constructor wants to make copies of the argument

Subject: [Boost-bugs] [Boost C++ Libraries] #2144: boost::thread constructor wants to make copies of the argument
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2008-07-24 13:54:54

#2144: boost::thread constructor wants to make copies of the argument
-----------------------------------+----------------------------------------
 Reporter:  mmikucionis_at_[hidden]  |       Owner:  anthonyw    
     Type:  Bugs                   |      Status:  new         
Milestone:  Boost 1.36.0           |   Component:  thread      
  Version:  Boost 1.35.0           |    Severity:  Optimization
 Keywords:                         |  
-----------------------------------+----------------------------------------
 Hi,

 I noticed that boost::thread constructor makes a copy of its argument.
 Suppose I have a big structure that I use as thread context and I don't
 want redundant copies on stack or anywhere else.

 For example:

 struct foo
 {
   void operator()()
   {
      // zzz
   }
 private:
   foo(foo&); // no copying, please
 };

 boost::thread(foo()); // this fails due to private copy constructor

 I bumped into this problem when I included boost::thread itself into the
 structure (forbids copying too ;).

 Thus I wonder if the argument could be replaced by a reference to an
 argument which would not insist on copying things.

 As a workaround I do the following now:

 void bar(foo *ptr) { (*ptr)(); }
 boost::thread(boost::bind(bar, new foo));

 I looked at repository on the web and I could not find class thread
 anymore (moved somewhere else since 1.35?), so maybe it's already fixed...

 Thanks for great library!

-- 
Ticket URL: <http://svn.boost.org/trac/boost/ticket/2144>
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