C++ Erase vector element by value rather than by position?

Question

vector<int> myVector;

and lets say the values in the vector are this (in this order):

5 9 2 8 0 7

If I wanted to erase the element that contains the value of "8", I think I would do this:

myVector.erase(myVector.begin()+4);

Because that would erase the 4th element. But is there any way to erase an element based off of the value "8"? Like:

myVector.eraseElementWhosValueIs(8);

Or do I simply just need to iterate through all the vector elements and test their values?

Answer 1

You can not do that directly. You need to use std::remove algorithm to move the element to be erased to the end of the vector and then use erase function. Something like: myVector.erase(std::remove(myVector.begin(), myVector.end(), 8), myVec.end());. See this erasing elements from vector for more details.

Answer 2

You can use std::find to get an iterator to a value:

#include <algorithm>
std::vector<int>::iterator position = std::find(vector.begin(), vector.end(), 8);
if (position != vector.end()) // == vector.end() means the element was not found
    myVector.erase(position);

Answer 3

How about std::remove() instead:

vec.erase(std::remove(vec.begin(), vec.end(), 8), vec.end());