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Algorithm transform - Generates a sequence of elements by applying a unary function

Algorithm transform - Generates a sequence of elements by applying a unary function


transform
	
 
Header
<algorithm>

template<class InputIterator, class OutputIterator, class UnaryOperator>
OutputIterator transform(InputIterator first, InputIterator last, OutputIterator result, UnaryOperator op)

Generates a sequence of elements by applying a unary function op to each element of the range [first, last). It copies the resulting sequence in the range starting result.

template<class InputIterator1, class InputIterator2, class OutputIterator, class BinaryOperator>
OutputIterator transform(InputIterator first1, InputIterator1 last1, InputIterator2 first2, OutputIterator result, BinaryOperator op)

Generates a sequence of elements by applying binary function op to corresponding elements in the range [first1, last1) and elements in the range starting at first2 upto N elements. N = first1 - last1. It copies the resulting sequence in the range starting result.


Sample

#pragma warning(disable : 4786)

#include <algorithm>
#include <iostream>
#include <functional>

int main()
{
	int array1[9] = { 1, 2, 3, 4, 5, 6, 7, 8, 9} ;
	int array2[9] , array3[9] ;

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

	std::cout << "\n\narray1 = " ;
	std::copy(array1, array1+9, intOstreamIt) ;
	std::cout << std::endl ;

	//transform
	//initialize array2 with negatives of elements in array1
	std::transform(array1, array1+9, array2, std::negate<int>()) ;

	std::cout << "\n\narray2, after transform = " ;
	std::copy(array2, array2+9, intOstreamIt) ;
	std::cout << std::endl ;

	//initialize array3 with product of elements in array1 and array2
	std::transform(array1, array1+9, array2, array3, std::multiplies<int>()) ;

	std::cout << "\n\narray3, after transform = " ;
	std::copy(array3, array3+9, intOstreamIt) ;
	std::cout << std::endl ;
	
	return 0 ;
}

Program Output

array1 = 1, 2, 3, 4, 5, 6, 7, 8, 9,


array2, after transform = -1, -2, -3, -4, -5, -6, -7, -8, -9,


array3, after transform = -1, -4, -9, -16, -25, -36, -49, -64, -81,