How to delete more than one element from an array in C++?

Question

I have a question..How can I delete more than one elements from an one dimensional array in C++? Suppose I have an array A={1,3,5,8,9,7} and I want to delete suppose 3,5,7 from array A. Please kindly let me know if anyone knows any efficient algorithm.

You cannot "delete eleemnts from an array". Arrays have fixed size. You should use a standard library container instead. — Kerrek SB
– Kerrek SB, Commented Oct 7, 2013 at 15:57

SirGuy · Accepted Answer · 2013-10-07 15:57:59Z

7

Arrays are not resizable in C++. The best option for a resizable container is std::vector which you would use as:

    std::vector<int> v = {1,3,5,8,9,7};

and then to remove elements by some predicate:

   auto new_end = std::remove_if(v.begin(), v.end(),
                                 std::bind(std::less<int>(), _1, 6));

But this only shuffles the elements around your vector so that they are all at the end. To the actually erase them, you need to call:

   v.erase(new_end, v.end());

answered Oct 7, 2013 at 15:57

SirGuy

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