Question

I’m trying to create a packaged task with a functor like this:

Worker w(someString, anotherString, i*length,length);
boost::packaged_task<Match> task(&w);

Operator in the Worker-class is looking like this:

Class Worker {
   Match operator()()
   {
      return matchText(..., ..., ..., ...);
   }
}

Compiler gives me error (translated the error-message from German)

C2064: Statement results in no function which passes 0 arguments

What am I doing wrong?

Answer 1

The constructor of boost::packaged_task expects a functor object (either lvalue or rvalue), not a pointer to it.

boost::packaged_task<Match> task(w);

or

boost::packaged_task<Match> task(std::move(w));