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<TITLE>The Accept Member Function</TITLE>
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<b>Data Structures and Algorithms 
with Object-Oriented Design Patterns in C++</b><br>
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<H3><A NAME="SECTION007114000000000000000">The <tt>Accept</tt> Member Function</A></H3>
<P>
Program&nbsp;<A HREF="page136.html#progstack3c" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page136.html#progstack3c"><IMG  ALIGN=BOTTOM ALT="gif" SRC="cross_ref_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/cross_ref_motif.gif"></A> defines the <tt>Accept</tt>
member function for the <tt>StackAsArray</tt> class.
As discussed in Chapter&nbsp;<A HREF="page107.html#chapadts" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/page107.html#chapadts"><IMG  ALIGN=BOTTOM ALT="gif" SRC="cross_ref_motif.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/icons/cross_ref_motif.gif"></A>,
the purpose of the <tt>Accept</tt> member function of a container,
is to accept a visitor,
and cause it to visit one-by-one all of the contained objects.
<P>
<P><A NAME="6287">&#160;</A><A NAME="progstack3c">&#160;</A> <IMG WIDTH=575 HEIGHT=162 ALIGN=BOTTOM ALT="program5914" SRC="img712.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img712.gif"  ><BR>
<STRONG>Program:</STRONG> <tt>StackAsArray</tt> Class <tt>Accept</tt> 	Member Function Definition<BR>
<P>
<P>
In the array implementation of the stack,
the elements contained in the container occupy positions
0, 1, ...,  <IMG WIDTH=68 HEIGHT=20 ALIGN=MIDDLE ALT="tex2html_wrap_inline61316" SRC="img711.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img711.gif"  > of the array.
The body of the <tt>Accept</tt> function is simply a loop
which calls the <tt>Visit</tt> function for each object in the stack.
The running time of the <tt>Accept</tt> function depends on
the running time of the function <tt>Visit</tt>.
Let  <IMG WIDTH=66 HEIGHT=26 ALIGN=MIDDLE ALT="tex2html_wrap_inline61326" SRC="img713.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img713.gif"  > be the running time of the function <tt>Visit</tt>.
In addition to the time for the function call,
each iteration of the loop incurs a constant overhead.
Consequently,
the total running time for <tt>Accept</tt> is  <IMG WIDTH=129 HEIGHT=26 ALIGN=MIDDLE ALT="tex2html_wrap_inline61328" SRC="img714.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img714.gif"  >,
where <I>n</I> is the number of objects in the container.
And if  <IMG WIDTH=120 HEIGHT=26 ALIGN=MIDDLE ALT="tex2html_wrap_inline61332" SRC="img715.gif" tppabs="http://dictator.uwaterloo.ca/Bruno.Preiss/books/opus4/html/img715.gif"  >, the total running time is to <I>O</I>(<I>n</I>).
<P>
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