std::transform with predicate : transform « STL Algorithms Modifying sequence operations « C++

1. C++
2. STL Algorithms Modifying sequence operations
3. transform

std::transform with predicate

  
 

#include <iostream>
using std::cout;
using std::endl;

#include <algorithm>
#include <numeric>
#include <vector>
#include <iterator>

int calculateCube( int );

int main()
{

   std::ostream_iterator< int > output( cout, " " );

   int a2[ 10 ] = { 100, 2, 8, 1, 50, 3, 8, 8, 9, 10 };
   std::vector< int > v2( a2, a2 + 10 ); // copy of a2
   cout << "Vector v2 contains: ";
   std::copy( v2.begin(), v2.end(), output );

   std::vector< int > cubes( 10 ); // instantiate vector cubes

   // calculate cube of each element in v; place results in cubes
   std::transform( v2.begin(), v2.end(), cubes.begin(), calculateCube );
   cout << "\n\nThe cube of every integer in Vector v is:\n";
   std::copy( cubes.begin(), cubes.end(), output );


   cout << endl;
   return 0;
}
int calculateCube( int value )
{
   return value * value * value;
}

/* 
Vector v2 contains: 100 2 8 1 50 3 8 8 9 10

The cube of every integer in Vector v is:
1000000 8 512 1 125000 27 512 512 729 1000

 */        
    
  

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