Computing the distance between vectors using inner_product - C++ template

C++ examples for template:template function

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Description

Computing the distance between vectors using inner_product

Demo Code

#include <numeric>
#include <cmath>
#include <iostream>
#include <functional>

using namespace std;

template<class Value_T>
struct DiffSquared {
  Value_T operator()(Value_T x, Value_T y) const {
    return (x - y) * (x - y);
  }//  w  w w  .  j  av a2 s  .  c o m
};

template<class Iter_T, class Iter2_T>
double vectorDistance(Iter_T first, Iter_T last, Iter2_T first2)  {
  double ret = inner_product(first, last, first2, 0.0L, plus<double>(), DiffSquared<double>());
  return ret > 0.0 ? sqrt(ret) : 0.0;
}
int main() {
  int v1[] = { 1, 5 };
  int v2[] = { 4, 9 };
  cout << "distance between vectors (1,5) and (4,9) is ";
  cout << vectorDistance(v1, v1 + 2, v2) << endl;
}

Result


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