gistfile1.cpp

// This is a quick example to show how something like ruby blocks might be implemented in another language

// psuedo code follows, don't get hung up on syntax
class Array {
  std::vector<int> array;
  
  Array (std::vector in) {
    self.array = in;
  }
  
  // the array itself has a .each member function that accepts a block (anonymous function) as an argument 
  void each(&block) {
  
    // .each will iterate over itself in a totally old school procedural fashion
    for(unsigned int i=0; i < self.array.size(); i++) {
    
      // for each element of the array, it just calls the block (anonymous function) 
      // you gave .each with that element as an argument
      block(self.array[i]);
    }
  }
}

// this function is the "block" that we'll pass in to the .each method
void printstuff (string arg) {
  printf("%s\n", arg);
}

foo = Array.new(['foo','bar','baz']);

// ruby's language syntax makes it easy to declare the block anonymously, right inline.
// here, we pass in a function pointer instead to show what's going on behind the scenes
foo.each(&printstuff);