public member function

deque::front

      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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
 
// 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)