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Assignment operator/copy constructor issue with Boost.Function

Started by Craig_jb Jun 7, 2012 at 10:09 PM 0 replies 2.9k views

Original Post

Jun 7, 2012 at 10:09 PM

I've scoured the internet for hours on this one and still cannot figure it out! Any help is appreciated.


 typedef boost::function<void ()> TaskKernel;
 void TaskScheduler::pushTask(const TaskData& taskData, TaskKernel kernel) 
 { 
 Task* task = m_taskPool->obtain(); 
 task->m_kernel = TaskKernel(kernel);
 task->m_taskData = taskData;
 }
 // later in the calling code
 sch->pushTask(TaskData(), boost::bind(&run);

I get an EXC_BAD_ACCESS in boost move_assign function for the copy constructor or operator= every time. I tried passing the function without boost::bind and with all different variations. No luck...

Is there a special technique I am missing for passing boost::functions around?

the_edd

Jun 7, 2012 at 11:00 PM

Perhaps try changing this:


 // task->m_kernel = TaskKernel(kernel);
 task->m_kernel = kernel;

I haven't looked at the latest code for boost::function, but if it's doing move-emulation for your non-C++11 compiler, that might be causing trouble. If you really need the extra copy, try copying it to a named temporary prior to the assignment (making the source of the assignment an l-value).

EDIT: perhaps you also intended to use pass-by-const-reference for the 'kernel' argument in pushTask()? Though I don't think that will cause this problem.

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