STL like container typedef shortcut?

Question

A common pattern with STL containers is this:

map map;
for(map::iterator iter = map.begin(); iter != map.end(); ++iter)
{
  .         


        

Answer 1

Over the past few years I've really tried to move away from using manually written loops in preference to using the STL algorithms. Your above code can be changed to:

struct DoLoopBody {
  template 
  inline void operator()(ValueType v) const {
    // ...
  }
};

std::for_each (map.begin(), map.end(), DoLoopBody ());

Unfortunately the class DoLoopBody cannot be a local class, which is often highlighted as a disadvantage. However, I see this as an advantage in that the body of the loop can now be unit tested in isolation.