C Erase vector element by value rather than by position

Question

vector lt int gt  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

User · Accepted Answer

How about std  remove   instead    include  lt algorithm gt      vec erase std  remove vec begin    vec end    8   vec end       This combination is also known as the erase-remove idiom

User · Answer

Eric Niebler is working on a range-proposal and some of the examples show how to remove certain elements  Removing 8  Does create a new vector    include  lt iostream gt   include  lt range v3 all hpp gt   int main int argc  char const  argv          std  vector lt int gt  vi 2 4 6 8 10       for  auto amp  i   vi            std  cout  lt  lt  i  lt  lt  std  endl            std  cout  lt  lt   -----   lt  lt  std  endl      std  vector lt int gt  vim   vi   ranges  view  remove if    int i  return i    8         for  auto amp  i   vim            std  cout  lt  lt  i  lt  lt  std  endl            return 0      outputs     2   4   6   8   10   -----   2   4   6   10

User · Answer

You can use std  find to get an iterator to a value    include  lt algorithm gt  std  vector lt int gt   iterator position   std  find myVector begin    myVector end    8   if  position    myVector end          myVector end   means the element was not found     myVector erase position

User · Answer

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

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

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