What is fastest?

[carl]

What is fastest, indexing or iterating a std::vector:

std::vector<std::string> container;
// Add 100000 strings to container

std::vector<std::string>::iterator it = container.begin()
while (it != container.end()) {
std::string str = *it;
// do something with str
it++;
}

or

int size = container.size();
for (int i=0; i< size; i++) {
std::string str = container[i];
// do something with str
}

On this page:

http://stackoverflow.com/questions/776624/whats-faster-iterating-an-stl-vector-with-vectoriterator-or-with-at

there are some different opinions, but what are your experinces?

[Victor Bazarov]

In my experience, those things are compiler-specific, system-specific,
and cannot be theorised upon. They need to be measured.

V
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[Bo Persson]

I think that "different opinions" is the correct result :-)

It varies some, but the difference is VERY small. The "do something
with str" is highly likely to dominate the timing anyway.

Bo Persson