Erase-remove idiom

A common programming task is to remove all elements that have a certain value or fulfill a certain criteria from a collection. In C++, this could be achieved using a hand-written loop. It is, however, preferred to use an algorithm from the C++ Standard Library for such tasks.

The algorithms library provides the remove and remove_if algorithms for this. Because these algorithms operate on a range of elements denoted by two forward iterators, they have no knowledge of the underlying container or collection. Thus, the elements are not actually removed from the range, merely moved to the end. When all the removed elements are at the end of the range, remove returns an iterator pointing one past the last unremoved element.

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Tomasz Kulig