std::remove_if is an STL algorithm to removed elements from a container.

std::remove_if overwrites values that must be removed by values that must not be removed with preserving the order. For example: removing '1' from '01112' generates '02112'
std::remove_if returns an iterator to where the container would end would these values be removed. For example: after removing '1' from '01112', which generates '02112', returns an iterator pointing to the first '1'

Download the Qt Creator project 'CppRemove_if' (zip)


#include <algorithm>

#include <cassert>

#include <functional>

#include <vector>



int main()

{

  //Create a std::vector with some values in it

  std::vector<int> v;

  v.push_back(0);

  v.push_back(1);

  v.push_back(2);



  //Check

  assert(v.size() == 3);

  assert(v[0]==0);

  assert(v[1]==1);

  assert(v[2]==2);



  //Remove the '1'

  const std::vector<int>::iterator new_end

   = std::remove_if(v.begin(),v.end(),std::bind2nd(std::equal_to<int>(),1));



  //Resize the std::vector

  v = std::vector<int>(v.begin(),new_end);



  //Check

  assert(v.size() == 2);

  assert(v[0]==0);

  assert(v[1]==2);

}

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(C++) std::remove_if