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Tip of the Day
Language: C++
Expertise: Intermediate
Feb 22, 2000



Building the Right Environment to Support AI, Machine Learning and Deep Learning

The replace() Algorithm

Another useful STL algorithm is replace(), which is defined in the standard header <algorithm> and has the following prototype:

  void replace (ForwardIterator start, 
                        ForwardIterator end, 
                        const T & old_value,
                        const T & new_value);
The first and the second arguments mark the sequence's beginning and end, respectively. replace() changes every occurrence of old_value in the sequence to new_value.

The following example uses replace() to replace every occurrence "NT" by "Win2000" in a vector of strings. You can apply replace() to built-in arrays, too. In the second example, replace() scans an array of integers and replaces every 1 by 5:

  #include <algorithm>
  #include <string>
  #include <vector>
  using namespace std;
    vector <string> vs;
      // fill vector
    vs.push_back ("Unix");
    vs.push_back ("VMS");
    vs.push_back ("NT");
      // replace every occurrence of "NT" by "Win2000"
    replace (vs.begin(), vs.end(), "NT", "Win2000");
      // replace() can be applied to built-in arrays too
    int n [] = {1, 0, 2, 1};
    replace( n, n + 4, -1, 5); // replace every 1 by 5
Danny Kalev
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