C++ Vector Library - crbegin() Function

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Description

The C++ function std::vector::crbegin() returns a constant reverse iterator which points to the last element of the container i.e reverser beginning of container.

Declaration

Following is the declaration for std::vector::crbegin() function form std::vector header.

C++11

const_reverse_iterator crbegin() const noexcept;

Parameters

None

Return value

Returns a random access reverse iterator which points to the reverse beginning of the container.

Exceptions

This member function never throws exception.

Time complexity

Constant i.e. O(1)

Example

The following example shows the usage of std::vector::crbegin() function.

#include <iostream>
#include <vector>

using namespace std;

int main(void) {
   vector<int> v = {1, 2, 3, 4, 5};

   for (auto it = v.crbegin(); it != v.crend(); ++it)
      cout << *it << endl;

   return 0;
}

Let us compile and run the above program, this will produce the following result −

5
4
3
2
1