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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=iso-8859-1">
<meta name="GENERATOR" content="Microsoft FrontPage 2.0">
<title>Class DS_CONTAINER</title>
</head>
<body bgcolor="#FFFFFF">
<table border="0" width="100%">
<tr>
<td><font size="6"><strong>Class DS_CONTAINER</strong></font></td>
<td align="right"><a href="ds_comparator.html"><img
src="../../image/previous.gif" alt="Previous" border="0"
width="40" height="40"></a><a href="ds_cursor.html"><img
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width="40" height="40"></a></td>
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</table>
<hr size="1">
<pre><font color="#000080"><em><strong>indexing</strong></em></font></pre>
<blockquote>
<pre><em>description</em>:
<font color="#800000"><em> "Data structures that can hold zero or more items"
</em></font><em>library: </em><font color="#800000"><em>"Gobo Eiffel Structure Library"
</em></font><em>author: </em><font color="#800000"><em>"Eric Bezault <</em></font><a
href="mailto:ericb@gobosoft.com"><font color="#800000"><em>ericb@gobosoft.com</em></font></a><font
color="#800000"><em>>"
</em></font><em>copyright: </em><font color="#800000"><em>"Copyright (c) 1999, Eric Bezault and others"
</em></font><em>license: </em><font color="#800000"><em> "Eiffel Forum Freeware License v1 (see forum.txt)"</em></font></pre>
</blockquote>
<pre><font color="#000080"><em><strong>deferred class interface</strong></em></font></pre>
<blockquote>
<pre><em>DS_CONTAINER </em>[<em>G</em>]</pre>
</blockquote>
<pre><font color="#000080"><em><strong>feature</strong></em></font><em> </em>{<em>NONE</em>}<font
color="#008000"> -- Initialization</font></pre>
<blockquote>
<pre><a name="make_default"><em>make_default</em></a><em>
</em><font color="#008000"> -- Create an empty container.</font><em>
</em><font color="#000080"><em><strong> deferred</strong></em></font><em>
</em><font color="#000080"><em><strong>ensure</strong></em></font><em>
empty</em>:<em> </em><a href="#is_empty"><em>is_empty</em></a></pre>
</blockquote>
<pre><font color="#000080"><em><strong>feature</strong></em></font><font
color="#008000"> -- Measurement</font></pre>
<blockquote>
<pre><a name="count"><em>count</em></a>:<em> </em><a
href="http://www.gobosoft.com/eiffel/nice/elks95/integer.html"><em>INTEGER</em></a><font
color="#000080"><em><strong>
</strong></em></font><font color="#008000">-- Number of items in container</font><font
color="#000080"><em><strong>
deferred</strong></em></font></pre>
</blockquote>
<pre><font color="#000080"><em><strong>feature</strong></em></font><font
color="#008000"> -- Status report</font></pre>
<blockquote>
<pre><a name="is_empty"><em>is_empty</em></a>:<em> </em><a
href="http://www.gobosoft.com/eiffel/nice/elks95/boolean.html"><em>BOOLEAN</em></a><font
color="#000080"><em><strong>
</strong></em></font><font color="#008000"> -- Is container empty?</font></pre>
</blockquote>
<pre><font color="#000080"><em><strong>feature</strong></em></font><font
color="#008000"> -- Comparison</font></pre>
<blockquote>
<pre><a name="is_equal"><em>is_equal</em></a><em> </em>(<em>other</em>:<em> </em><font
color="#000080"><em><strong>like</strong></em></font><em> </em><font
color="#008080"><em>Current</em></font><em>)</em>:<em> </em><a
href="http://www.gobosoft.com/eiffel/nice/elks95/boolean.html"><em>BOOLEAN</em></a><em>
</em><font color="#008000">-- Is current container equal to </font><em>other</em><font
color="#008000">?</font><em>
</em><font color="#008000">-- (From </font><a
href="http://www.gobosoft.com/eiffel/nice/elks95/general.html#is_equal"><font
color="#008000"><em>GENERAL</em></font></a><font color="#008000">.)</font><em>
</em><font color="#000080"><em><strong>require</strong></em></font><em>
other_not_void</em>:<em> other </em>/=<em> </em><font
color="#008080"><em>Void</em></font><em>
</em><font color="#000080"><em><strong>deferred</strong></em></font><em>
</em><font color="#000080"><em><strong>ensure</strong></em></font><em>
consistent</em>:<em> </em><a
href="http://www.gobosoft.com/eiffel/nice/elks95/general.html#standard_is_equal"><em>standard_is_equal</em></a><em> </em>(<em>other</em>)<em> </em><font
color="#000080"><em><strong>implies</strong></em></font><em> </em><font
color="#008080"><em>Result</em></font><em>
same_type</em>:<em> </em><font color="#008080"><em>Result</em></font><em> </em><font
color="#000080"><em><strong>implies</strong></em></font><em> </em><a
href="http://www.gobosoft.com/eiffel/nice/elks95/general.html#same_type"><em>same_type</em></a><em> </em>(<em>other</em>)<em>
symmetric</em>:<em> </em><font color="#008080"><em>Result</em></font><em> </em><font
color="#000080"><em><strong>implies</strong></em></font><em> other</em>.<a
href="#is_equal"><em>is_equal</em></a><em> </em>(<font
color="#008080"><em>Current</em></font>)<em>
same_count</em>:<em> </em><font color="#008080"><em>Result</em></font><em> </em><font
color="#000080"><em><strong>implies</strong></em></font><em> count </em>=<em> other</em>.<a
href="#count"><em>count</em></a></pre>
</blockquote>
<pre><font color="#000080"><em><strong>feature</strong></em></font> <font
color="#008000">-- Duplication</font></pre>
<blockquote>
<pre><a name="copy"><em>copy</em></a><em> </em>(<em>other</em>:<em> </em><font
color="#000080"><em><strong>like</strong></em></font><em> </em><font
color="#008080"><em>Current</em></font>)<em>
</em><font color="#008000">-- Copy </font><em>other</em><font
color="#008000"> to current container.
-- (From </font><a
href="http://www.gobosoft.com/eiffel/nice/elks95/general.html#copy"><font
color="#008000"><em>GENERAL</em></font></a><font color="#008000">.)</font><em>
</em><font color="#000080"><em><strong>require</strong></em></font><em>
other_not_void</em>:<em> other </em>/= <font
color="#008080"><em>Void</em></font><em>
type_identity</em>:<em> </em><a
href="http://www.gobosoft.com/eiffel/nice/elks95/general.html#same_type"><em>same_type</em></a><em> </em>(<em>other</em>)<em>
</em><font color="#000080"><em><strong>deferred
ensure</strong></em></font><em>
is_equal</em>:<em> </em><a href="#is_equal"><em>is_equal</em></a><em> </em>(<em>other</em>)</pre>
</blockquote>
<pre><font color="#000080"><em><strong>feature</strong></em></font><font
color="#008000"> -- Removal</font></pre>
<blockquote>
<pre><a name="wipe_out"><em>wipe_out</em></a><em>
</em><font color="#008000">-- Remove all items from container.</font><em>
</em><font color="#000080"><em><strong>deferred
ensure</strong></em></font><em>
wiped_out</em>:<em> </em><a href="#is_empty"><em>is_empty</em></a></pre>
</blockquote>
<pre><a name="invariant"><font color="#000080"><em><strong>invariant</strong></em></font></a></pre>
<blockquote>
<pre><em>positive_count</em>:<em> </em><a href="#count"><em>count</em></a><em> </em>>=<em> </em><font
color="#808000"><em>0</em></font><em>
empty_definition</em>:<em> </em><a href="#is_empty"><em>is_empty</em></a><em> </em>= (<a
href="#count"><em>count</em></a><em> </em>=<em> </em><font
color="#808000"><em>0</em></font>)</pre>
</blockquote>
<pre><font color="#000080"><em><strong>end</strong></em></font><font
color="#008000"> -- class DS_CONTAINER</font></pre>
<hr size="1">
<table border="0" width="100%">
<tr>
<td><address>
<font size="2"><b>Copyright 1999-2001</b></font><font
size="1"><b>, </b></font><font size="2"><strong>Eric
Bezault</strong></font><strong> </strong><font
size="2"><br>
<strong>mailto:</strong></font><a
href="mailto:ericb@gobosoft.com"><font size="2">ericb@gobosoft.com</font></a><font
size="2"><br>
<strong>http:</strong></font><a
href="http://www.gobosoft.com"><font size="2">//www.gobosoft.com</font></a><font
size="2"><br>
<strong>Last Updated:</strong> 31 March 2001</font><br>
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$Date: 2001/04/06 16:08:39 $
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