How do I remove an element from a vector? For example, removing the 3 from a vector containing 1,2,3,4 so it becomes 1,2,4
How do I remove an element from a vector? For example, removing the 3 from a vector containing 1,2,3,4 so it becomes 1,2,4
Call std::vector.erase with the index you want to erase, in case the 3rd index:
Or if you have an iterator, that should work too.Code:std::vector myvec; // Assume vector is filled with data myvec.erase(myvec.begin() + 2);
Last edited by Elysia; 02-04-2008 at 12:24 AM.
Originally Posted by Adak
or if you want to remove all elements equal to 3 so that 1,3,2,3,4,3 becomes 1,2,4 use the erase-remove idiom:
Code:v.erase( remove( v.begin(), v.end(), 3 ), v.end() );
Actually, that's +2, not +3, for erasing the third item.
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Linus Torvalds: "But it clearly is the only right way. The fact that everybody else does it some other way only means that they are wrong"
Right, silly me. 0-based index.
/slaps self.
note that vector's erase takes linear time (proportional to the size of the dataset). If you are doing this relatively often, you should be using something like linked lists.
