Concept difference between pre and post increment operator for STL

Question

Supposedly:

for (vector::iterator iter = ivec.begin(); iter != ivec.end(); ++iter)
{}

I do understand the difference when it com

Answer 1

In general pre-increment is usually preferable to post-increment because it may allow for some optimization that can avoid temporaries being constructed. As to exactly how it's implemented that depends on the STL included with your compiler.