Predicate to perform operator== on two values.

Example

The code below shows how to replace values that are equal to a zero by a one. Note: this is not a preferred version of ReplaceZeroByOne.


#include <vector>

#include <algorithm

#include <numeric>



void ReplaceZeroByOne(std::vector<int>& v)

{

  std::replace_if(v.begin(),v.end(),

    std::bind2nd(std::equal_to<int>(),0),1);

}

Another exaple


#include <algorithm>

#include <cassert>

#include <functional>

#include <vector>



int main()

{

  //Create a std::vector of 99 zeros and a single 42

  std::vector<int> v(99,0);

  v.push_back(42);



  //Shuffle the std::vector

  std::random_shuffle(v.begin(),v.end());



  //Count the zeros and 42 using std::find_if and std::bind_2nd

  // (though using std::count would be easier)

  assert(std::count_if(v.begin(),v.end(),

    std::bind2nd(std::equal_to<int>(),0)) == 99);

  assert(std::count_if(v.begin(),v.end(),

    std::bind2nd(std::equal_to<int>(),42)) == 1);

}

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(C++) std::equal_to

Example

Another exaple