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<HTML><HEAD><TITLE>enqueueHead Method</TITLE></HEAD><BODY bgcolor="#FFFFFF"> <a href="../index.html" target="_top"><img src="../icons/usins.gif" alt="Logo" align=right></a><b>Data Structures and Algorithms with Object-Oriented Design Patterns in Python</b><br><A NAME="tex2html3049" HREF="page161.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html3047" HREF="page159.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html3041" HREF="page159.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html3051" HREF="page611.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="../icons/index_motif.gif"></A> <BR><HR><H3><A NAME="SECTION006311000000000000000"><tt>enqueueHead</tt> Method</A></H3><P>Program&nbsp;<A HREF="page160.html#progdequeAsArraya"><IMG  ALIGN=BOTTOM ALT="gif" SRC="../icons/cross_ref_motif.gif"></A> defines the <tt>enqueueHead</tt> method.<P><P><A NAME="7919">&#160;</A><A NAME="progdequeAsArraya">&#160;</A> <IMG WIDTH=575 HEIGHT=313 ALIGN=BOTTOM ALT="program7778" SRC="img703.gif"  ><BR><STRONG>Program:</STRONG> <tt>DequeAsArray</tt> class <tt>enqueueHead</tt> method.<BR><P><P>In addition to <tt>self</tt>,the <tt>enqueueHead</tt> method takes a single argument which isthe object to be added to the head of the deque.The <tt>enqueueHead</tt> method first checks that the deque is not full--a <tt>ContainerFull</tt> exception is raised when the deque is full.Next, the position at which to insert the new element is determinedby decreasing the <tt>_head</tt> instance attribute by one modulo the length of the array.Finally, the object to be enqueued is put into the arrayat the correct position and the <tt>_count</tt> is adjusted accordingly.Under normal circumstances (i.e., when the exception is not raised),the running time of <tt>EnqueueHead</tt> is <I>O</I>(1).<P><HR><A NAME="tex2html3049" HREF="page161.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="../icons/next_motif.gif"></A> <A NAME="tex2html3047" HREF="page159.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="../icons/up_motif.gif"></A> <A NAME="tex2html3041" HREF="page159.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="../icons/previous_motif.gif"></A>  <A NAME="tex2html3051" HREF="page611.html"><IMG WIDTH=43 HEIGHT=24 ALIGN=BOTTOM ALT="index" SRC="../icons/index_motif.gif"></A> <P><ADDRESS><img src="../icons/bruno.gif" alt="Bruno" align=right><a href="../copyright.html">Copyright &#169; 2003</a> by <a href="../signature.html">Bruno R. Preiss, P.Eng.</a>  All rights reserved.</ADDRESS></BODY></HTML>

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