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Showing content from https://cplusplus.com/reference/deque/deque/cend/ below:

public member function

<deque>

std::deque::cend 
const_iterator cend() const noexcept;

Return const_iterator to end

Returns a const_iterator pointing to the past-the-end element in the container.

A const_iterator is an iterator that points to const content. This iterator can be increased and decreased (unless it is itself also const), just like the iterator returned by deque::end, but it cannot be used to modify the contents it points to, even if the deque object is not itself const.

If the container is empty, this function returns the same as deque::cbegin.

The value returned shall not be dereferenced.



Parameters none

Return Value A const_iterator to the element past the end of the sequence.

Member type const_iterator is a random access iterator type that points to a const element.



Example 
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// deque::cbegin/cend
#include <iostream>
#include <deque>

int main ()
{
  std::deque<int> mydeque = {10,20,30,40,50};

  std::cout << "mydeque contains:";

  for (auto it = mydeque.cbegin(); it != mydeque.cend(); ++it)
    std::cout << ' ' << *it;

  std::cout << '\n';

  return 0;
}

Output: 
mydeque contains: 10 20 30 40 50


Complexity Constant.

Iterator validity No changes.

Data races The container is accessed.
No contained elements are accessed by the call, but the iterator returned can be used to access them. Concurrently accessing or modifying different elements is safe.

Exception safetyNo-throw guarantee: this member function never throws exceptions.
The copy construction or assignment of the returned iterator is also guaranteed to never throw.

See also
deque::end
Return iterator to end (public member function)
deque::cbegin
Return const_iterator to beginning (public member function)

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