deque.html

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Returns the <tt>n</tt>'th element.
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<tt>deque()</tt>
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Creates an empty deque.
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<tt>deque(size_type n)</tt>
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Creates a deque with <tt>n</tt> elements.
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<tt>deque(size_type n, const T&amp; t)</tt>
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Creates a deque with <tt>n</tt> copies of <tt>t</tt>.
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<tt>deque(const deque&amp;)</tt>
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The copy constructor.
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template &lt;class <A href="InputIterator.html">InputIterator</A>&gt;
deque(InputIterator f, InputIterator l)
<A href="#4">[4]</A>
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Creates a deque with a copy of a range.
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<tt>~deque()</tt>
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The destructor.
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<tt>deque&amp; operator=(const deque&amp;)</tt>
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The assignment operator
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<tt>reference front()</tt>
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 <A href="FrontInsertionSequence.html">Front Insertion Sequence</A>
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Returns the first element.
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<tt>const_reference front() const</tt>
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Returns the first element.
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<tt>reference back()</tt>
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 <A href="BackInsertionSequence.html">Back Insertion Sequence</A>
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Returns the last element.
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<tt>const_reference back() const</tt>
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 <A href="BackInsertionSequence.html">Back Insertion Sequence</A>
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Returns the last element.
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<tt>void push_front(const T&amp;)</tt>
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 <A href="FrontInsertionSequence.html">Front Insertion Sequence</A>
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Inserts a new element at the beginning.
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<tt>void push_back(const T&amp;)</tt>
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 <A href="BackInsertionSequence.html">Back Insertion Sequence</A>
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Inserts a new element at the end.
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<tt>void pop_front()</tt>
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 <A href="FrontInsertionSequence.html">Front Insertion Sequence</A>
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Removes the first element.
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<tt>void pop_back()</tt>
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 <A href="BackInsertionSequence.html">Back Insertion Sequence</A>
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Removes the last element.
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<tt>void swap(deque&amp;)</tt>
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Swaps the contents of two deques.
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iterator insert(iterator pos, 
                const T&amp; x)
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Inserts <tt>x</tt> before <tt>pos</tt>.
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template &lt;class <A href="InputIterator.html">InputIterator</A>&gt;
void insert(iterator pos, 
            InputIterator f, InputIterator l)
<A href="#4">[4]</A>
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Inserts the range <tt>[f, l)</tt> before <tt>pos</tt>.
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void insert(iterator pos,
            size_type n, const T&amp; x)
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Inserts <tt>n</tt> copies of <tt>x</tt> before <tt>pos</tt>.
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<tt>iterator erase(iterator pos)</tt>
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Erases the element at position <tt>pos</tt>.
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<tt>iterator erase(iterator first, iterator last)</tt>
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Erases the range <tt>[first, last)</tt>
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<tt>void clear()</tt>
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Erases all of the elements.
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bool operator==(const deque&amp;, 
                const deque&amp;)
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Tests two deques for equality.  This is a global function, not
   a member function.
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bool operator&lt;(const deque&amp;, 
               const deque&amp;)
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Lexicographical comparison.  This is a global function, not
   a member function.
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<h3>New members</h3>
All of <tt>deque</tt>'s members are defined in the 
<A href="RandomAccessContainer.html">Random access container</A>,
<A href="FrontInsertionSequence.html">Front insertion sequence</A>, 
and <A href="BackInsertionSequence.html">Back insertion sequence</A>
requirements.  <tt>Deque</tt> does not introduce any new members.
<h3>Notes</h3>
<P><A name="1">[1]</A>
The name <i>deque</i> is pronounced &quot;deck&quot;, and stands for
&quot;double-ended queue.&quot;  Knuth (section 2.6) reports that the name was
coined by E. J. Schweppe.  See section 2.2.1 of Knuth for more
information about deques.  (D. E. Knuth, <i>The Art of Computer
Programming.  Volume 1: Fundamental Algorithms</i>, second edition.  
Addison-Wesley, 1973.)
<P><A name="2">[2]</A>
Inserting an element at the beginning or end of a <tt>deque</tt> takes
amortized constant time.  Inserting an element in the middle is linear
in <tt>n</tt>, where <tt>n</tt> is the smaller of the number of 
elements from the insertion point to the beginning, and the number of 
elements from the insertion point to the end.
<P><A name="3">[3]</A>
The semantics of iterator invalidation for <tt>deque</tt> is as
follows.  <tt>Insert</tt> (including <tt>push_front</tt> and
<tt>push_back</tt>) invalidates all iterators that refer to a
<tt>deque</tt>.  <tt>Erase</tt> in the middle of a <tt>deque</tt>
invalidates all iterators that refer to the <tt>deque</tt>.  
<tt>Erase</tt> at the beginning or end of a <tt>deque</tt> (including
<tt>pop_front</tt> and <tt>pop_back</tt>) invalidates an iterator only
if it points to the erased element.
<P><A name="4">[4]</A>
This member function relies on <i>member template</i> functions, which
at present (early 1998) are not supported by all compilers.  If your
compiler supports member templates, you can call this function with
any type of <A href="InputIterator.html">input iterator</A>.  If your
compiler does not yet support member templates, though, then the
arguments must either be of type <tt>const value_type*</tt> or of type
<tt>deque::const_iterator</tt>.
<h3>See also</h3>
<tt><A href="Vector.html">vector</A></tt>,
<tt><A href="List.html">list</A></tt>,
<tt><A href="Slist.html">slist</A></tt>

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