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boost::thread(*this)

Started by bcome Dec 3, 2004 at 12:23 AM 0 replies 850+ views

Original Post

Dec 3, 2004 at 12:23 AM

I'm trying to compile something like this:


class ThreadedClass
{
public:
    boost::thread *this_thread;

    ThreadedClass();
    ~ThreadedClass();

    void operator ()();
}
ThreadedClass::ThreadedClass()
{
    this_thread = new boost::thread(*this);
}
ThreadedClass::~ThreadedClass()
{
    if (this_thread) delete this_thread;
}
void ThreadedClass::operator ()()
{
    std::cout << "void ThreadedClass::operator ()()!";
    std::cout << std::endl;
}

I have this simplified class and the real class in the same project. The simplified class compiles just fine, yet the real one gives me:


c:\some\folder\someproject\somesourcefile.cpp(36) : error C2664: 'boost::thread::thread(const boost::function0<R> &)' :
cannot convert parameter 1 from 'Namespace::RealClass' to 'const boost::function0<R> &'
        with
        [
            R=void
        ]
        and
        [
            R=void
        ]
        Reason: cannot convert from 'Namespace::RealClass' to 'const boost::function0<R>'
        with
        [
            R=void
        ]
        No constructor could take the source type, or constructor overload resolution was ambiguous

What is wrong? Also I can't even do this:


typedef void (*ThreadFunction)();
ThreadFunction = *this;

I'm compiling under MSVC++ .net Toolkit 2003 with MSVC++ .net 2003 SE headers & libraries. Edit: line split for ease.

joanusdmentia

Dec 3, 2004 at 12:53 AM

You'll want to use boost::bind():

this_thread = new boost::thread(boost::bind(MyThreadFunc,this));

Quote:
typedef void (*ThreadFunction)();

ThreadFunction = *this;

Of course it won't work, this points to an instance of ThreadedClass, *not* a function. operator() doesn't make the class a function, operator() is just a normal function. Passing a class with operator() like a function will only work if the parameter is templated, ie

template<typename Func>void dostuff(Func func){    func();}struct MyFunc{    void operator()()    {        // do stuff    }};void test(){    MyFunc myfunc;    dostuff(myfunc);}

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