[boost] Building ThreadPool with boost::function in boost::lockfree::queue

1 Apr 2013

      ...
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g++ -c -I/usr/local/boost_1_53_0/include TestFunctionCompleteness.cpp
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g++ -c --std=c++0x -I/usr/local/boost_1_53_0/include
TestFunctionCompleteness.cpp
I am having trouble typedef-ing a lockfree::queue with boost::function as
the element for a ThreadPool class I am writing.

TestJobQueue1 below compiles fine while TestJobQueue2 compile fails. I am
using gcc 4.7.2 and boost_1_53_0.

void doSomething() {
   std::cout << "Called doSomething\n";
}

typedef boost::function<void ()> FunctionType;

class TestJobQueue1 {
public:
   typedef std::vector<FunctionType> FunctionArray;

   TestJobQueue1() {
      std::cout << sizeof(FunctionType) << std::endl;
      FunctionType f(&doSomething);
      FunctionArray funcArray;
      funcArray.push_back(f);
      std::cout << funcArray.size() << std::endl;
   }
};

class TestJobQueue2 {
public:
   typedef boost::lockfree::queue<FunctionType> QueueType;

   TestJobQueue2() {
      std::cout << sizeof(FunctionType) << std::endl;
      FunctionType f(&doSomething);
      QueueType funcQueue;
      funcQueue.push(f);
   }
};

produces:

In file included from TestFunctionCompleteness.cpp:11:0:
/usr/local/boost_1_53_0/include/boost/lockfree/queue.hpp: In instantiation
of ‘class boost::lockfree::queue<boost::function<void()> >’:
TestFunctionCompleteness.cpp:42:17:   required from here
/usr/local/boost_1_53_0/include/boost/lockfree/queue.hpp:79:1: error:
invalid application of ‘sizeof’ to incomplete type
‘boost::STATIC_ASSERTION_FAILURE<false>’
/usr/local/boost_1_53_0/include/boost/lockfree/queue.hpp:83:1: error:
invalid application of ‘sizeof’ to incomplete type
‘boost::STATIC_ASSERTION_FAILURE<false>’

produces:

In file included from TestFunctionCompleteness.cpp:11:0:
/usr/local/boost_1_53_0/include/boost/lockfree/queue.hpp: In instantiation
of ‘class boost::lockfree::queue<boost::function<void()> >’:
TestFunctionCompleteness.cpp:42:17:   required from here
/usr/local/boost_1_53_0/include/boost/lockfree/queue.hpp:79:5: error:
static assertion failed: (boost::has_trivial_destructor<T>::value)
/usr/local/boost_1_53_0/include/boost/lockfree/queue.hpp:83:5: error:
static assertion failed: (boost::has_trivial_assign<T>::value)

Is boost::function somehow an incomplete type and not expected to work in
boost::lockfree::queue or is this a bug in the queue implementation? Can
anyone suggest a simple workaround?

Thank you,
Ryan Fogarty