Using transform() algorithm to negate and multiply function objects. - C++ STL Algorithm

C++ examples for STL Algorithm:transform

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Description

Using transform() algorithm to negate and multiply function objects.

Demo Code

#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
using namespace std;
template<class T> void show(const char *msg, T cont);
int main()/*  w w  w .j a v a 2  s  .  c o  m*/
{
   vector<int> v, v2, result(10);
   for(unsigned i=0; i < 10; ++i) v.push_back(i);
   for(unsigned i=0; i < 10; ++i) v2.push_back(i);
   show("Contents of v:\n", v);
   show("Contents of v2:\n", v2);
   cout << endl;
   // Multiply v and v2 together.
   transform(v.begin(), v.end(), v2.begin(), result.begin(), multiplies<int>());
   show("Result of multiplying the elements in v with those in v2:\n", result);
   cout << endl;
   // Next, negate the contents of result.
   transform(v.begin(), v.end(), v.begin(), negate<int>());
   show("After negating v:\n", v);
   return 0;
}
// Display the contents of a container.
template<class T> void show(const char *msg, T cont) {
   cout << msg;
   T::iterator itr;
   for(itr=cont.begin(); itr != cont.end(); ++itr)
      cout << *itr << " ";
   cout << "\n";
}

Result


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