deque::front


public member function
      reference front ( );
const_reference front ( ) const;

Access first element

Returns a reference to the first element in the deque container.

Unlike member deque::begin, which returns an iterator to this same element, this function returns a direct reference.

Parameters

none

Return value

A reference to the first element in the deque container.

Member types reference and const_reference are the reference types to the elements of the container (for the default storage allocation model, allocator, these are T& and const T& respectively).

Example

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// deque::front
#include <iostream>
#include <deque>
using namespace std;

int main ()
{
  deque<int> mydeque;

  mydeque.push_front(77);
  mydeque.push_back(16);

  mydeque.front() -= mydeque.back();

  cout << "mydeque.front() is now " << mydeque.front() << endl;

  return 0;
}


Output:
mydeque.front() is now 61


Complexity

Constant.

See also

deque::back Access last element (public member function)
deque::begin Return iterator to beginning (public member function)
deque::push_front Insert element at beginning (public member function)
deque::pop_front Delete first element (public member function)