21 февр. 2012 г. · I know that at() is slower than [] because of its boundary checking, which is also discussed in similar questions like C++ Vector at/[] operator speed.

26 мар. 2010 г. · const_iterators will most likely have none, or negligable, performance difference compared to ordinary iterators.

2 авг. 2011 г. · So with the at() you can react to the error state. Using the operator[] to access the vector out of index will result in undefined behavior.

8 дек. 2015 г. · Vector - using iterator vs index · I think there might be examples showing how to iterate over vectors out on the web somewhere. · Yes there is ...

31 окт. 2011 г. · The standard pattern to preserve iterators is to reserve space upfront, or use a container which preserves iterators. There are compromises either way.

29 февр. 2012 г. · My understanding is "iterator" is more efficient than "index access". (also I think vector::end() is more efficient than vector::size() ).

6 июл. 2016 г. · You should use [] when you are certain that no "out-of bounds" access will happen. You should use at() when "out of bounds" access may happen.

16 мар. 2012 г. · When using std::vector is it always faster when going trough all vector's elements via indexes than using of iterators?

17 янв. 2013 г. · Iterating over a vector using iterators is not faster and is not safer (actually if the vector is possibly resized during the iteration using ...

13 мая 2012 г. · No. STL containers are not thread safe. You should provide exclusive access to each thread(the one that removes/the one that adds), while they're accessing the ...