C++ iterators & loop optimization

Question

I see a lot of c++ code that looks like this:

for( const_iterator it = list.begin(),
     const_iterator ite = list.end();
     it != ite; ++it)

<

Answer 1

I always preferred the first one. Though with inline functions, compiler optimizations and relatively smaller container size ( in my case it's normally max 20-25 items) it really does not make any large difference with respect to performace.

const_iterator it = list.begin();
const_iterator endIt = list.end();

for(; it != endIt ; ++it)
{//do something
}

But recently I am using more of std::for_each wherever it's possible. Its optimized looping which helps to make the code look more readable than other two.

std::for_each(list.begin(), list.end(), Functor());

I will use the loop only when std::for_each cannot be used. (for ex: std::for_each does not allow you to break the loop unless an exception is thrown).