Object Mentor Blog: C++ Algorithms, Boost and function currying

C++ Algorithms, Boost and function currying

Brett Schuchert — Sat, 12 Jun 2010 23:41:00 -0500

I’ve been experimenting with C++ using the Eclipse CDT and gcc 4.4. Since I’m a fan of boost, I’ve been using that as well. I finally got into I realistic use of boost::bind.

I converted this:

int Dice::total() const {
  int total = 0;

  for(const_iterator current = dice.begin();
      current != dice.end();
      ++current)
    total += (*current)->faceValue();

  return total;
}

Into this:

int Dice::total() const {
  return std::accumulate(
      dice.begin(),
      dice.end(),
      0,
      bind(std::plus<int>(), _1, bind(&Die::faceValue, _2))
  );
}

To see how to go from the first version to the final version with lots of steps in between: http://schuchert.wikispaces.com/cpptraining.SummingAVector.

This is a first draft. I’ll be cleaning it up over the next few days. If you see typos, or if anything is not clear from the code, please let me know where. Also, if my interpretation of what boost is doing under the covers (there’s not much of that) is wrong, please correct me.

Thanks!

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