C++ Erase vector element by value rather than by position? [duplicate]

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.eraseElementWhoseValueIs(8); 

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

Answer 1

How about std::remove() instead:

#include <algorithm> ... vec.erase(std::remove(vec.begin(), vec.end(), 8), vec.end()); 

This combination is also known as the erase-remove idiom.

Answer 2

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

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