std::replace_copy_if is an STL algorithm to copy a range of elements and, while doing so, replace elements that satisfy a certain predicate.


#include <algorithm>

#include <cassert>

#include <functional>

#include <vector>



int main()

{

  //Create a vector with negative odd numbers

  std::vector<int> v;

  v.push_back( 0);

  v.push_back(-1);

  v.push_back( 2);

  v.push_back(-3);

  v.push_back( 4);

  v.push_back(-5);



  //Replace negatives by zero, simular to ReplaceNegativeByZero

  std::vector<int> w;

  std::replace_copy_if(

    v.begin(),                        //Check v from its first element ...

    v.end(),                          // ... to its last element

    std::back_inserter(w),            //Append result at w

    std::bind2nd(std::less<int>(),0), //If the value is less than zero...

    0);                               // ... set it to zero



  //Check if std::replace_copy_if works as expected

  assert(v.size() == 6);

  assert(w.size() == 6);

  assert(w[0] == 0);

  assert(w[1] == 0); //Replaced

  assert(w[2] == 2);

  assert(w[3] == 0); //Replaced

  assert(w[4] == 4);

  assert(w[5] == 0); //Replaced

}

External links

Cplusplus.com page about std::replace_copy_if

Go back to Richel Bilderbeek's C++ page.

Go back to Richel Bilderbeek's homepage.

(C++) std::replace_copy_if

External links