C++ algorithm transform() function

C++ algorithm transform() function with c++ tutorial for beginners and professionals with examples on adjacent_find(),any_of(), copy(), copy_if(), count(), count_if(), equal(), find(), find_end(), find_first_of(), find_if(), find_if_not(), for_each() etc.

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C++ Algorithm transform()

C++ Algorithm transform() function is used in two different ways:

1.unary operation:- This method performs unary operation op on the elements in range [first1, last1] and stores the result in range starting from result.

This transform() applies a function to each element of a range:

2.Binary operation:- This method performs binary operation binary_op on the elements in range [first1, last1] with the elements in the range starting with iterator first2 and stores the result in range starting from result.

This transform() takes two 2 ranges and applies a function that takes 2 parameters, on each couple of elements from the input ranges:

Syntax

unary operation(1)

template <class InputIterator, class OutputIterator, class UnaryOperation>
OutputIterator transform (InputIterator first1, InputIterator last1,
OutputIterator result, UnaryOperation op);

Binary operation(2)

template <class InputIterator1, class InputIterator2,
class OutputIterator, class BinaryOperation>
OutputIterator transform (InputIterator1 first1, InputIterator1 last1,
InputIterator2 first2, OutputIterator result,
BinaryOperation binary_op);

Parameter

first1: An input iterator pointing the position of the first element of the first range to be operated on.

last1: An iterator pointing the position one past the final element of the first range to be operated on.

first2: Input iterator pointing to the first element in the second range to be operated on.

result: An output iterator to the initial position of the range where the operation results are stored.

op: Unary function applied to each element of the range.

binary_op: Binary function that two elements passed as its arguments.

Return value

transform() returns an iterator pointing to the end of the transformed range.

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Java

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