demonstrate the two-sequence form of transform() : transform « STL Algorithms Modifying sequence operations « C++






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

demonstrate the two-sequence form of transform()

  
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int midpoint(int a, int b);

template<class T> void show(const char *msg, vector<T> vect);

int main()
{
  int i;

  vector<double> v;

  for(i=1; i < 10; ++i) 
     v.push_back((double)i);

  show("Initial contents of v:", v);

  vector<int> v3, v4, v5(10);
  for(i = 0; i < 10; ++i) 
     v3.push_back(i);
  for(i = 10; i < 20; ++i) {
     if(i%2) {
        v4.push_back(i); 
     }else {
        v4.push_back(-i);
     }
  }

  show("Contents of v3:", v3);
  show("Contents of v4:", v4);

  transform(v3.begin(), v3.end(), v4.begin(), v5.begin(), midpoint);

  show("Contents of v5:", v5);

  return 0;
}

template<class T> void show(const char *msg, vector<T> vect) {
  cout << msg << endl;
  for(unsigned i=0; i < vect.size(); ++i)
    cout << vect[i] << endl;
}

// Return the whole-number midpoint between two values.
int midpoint(int a, int b) {
  return((a-b) / 2) + b;
}








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4.Use generic template function with transform
5.Use transform to negate all elements in a container
6.Use transform to transform elements in one container into another container with ten times their value
7.Use transform to print elements negatively and in reverse order
8.Use transform to square each element
9.Use transform to add each element traversed forward with each element traversed backward
10.Use transform to print differences of two corresponding elements
11.Compute the difference
12.Demonstrate both unary and binary function objects.
13.Use a binary function object to find the midpoints between elements in v3 and v4 and store the results in v5.
14.Subtract the mean from every data point
15.Create a sequence that contains the midpoints between the values in two other sequences.
16.Use transform to make the numbers in a list go from a certain range