Where is erase_if?

Question

I\'ve got a container and would like to erase elements based on a predicate. erase_if sounds familiar, but I can\'t find it in C++. What\'s the name and where i

Answer 1

I'm guessing you're thinking of remove_if which takes a predicate to determine if the element ought to be removed.

remove_if returns an iterator pointing to the beginning of the elements to remove in the container. To actually remove them you need to use erase:

container.erase(remove_if(container.start(), container.end(), pred), container.end())

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Either that or perhaps you mistakenly recalled the copy_if algorithm? Which somehow got left out of the standard but was written about - and implemented - in Effective STL.