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<h1>linked.cpp</h1><p>An example of the linked object classes and their use.</p>
<div class="fragment"><pre class="fragment"><span class="comment">// Copyright (C) 2006-2010 David Sugar, Tycho Softworks.</span>
<span class="comment">//</span>
<span class="comment">// This file is part of GNU uCommon C++.</span>
<span class="comment">//</span>
<span class="comment">// GNU uCommon C++ is free software: you can redistribute it and/or modify</span>
<span class="comment">// it under the terms of the GNU Lesser General Public License as published </span>
<span class="comment">// by the Free Software Foundation, either version 3 of the License, or</span>
<span class="comment">// (at your option) any later version.</span>
<span class="comment">//</span>
<span class="comment">// GNU uCommon C++ is distributed in the hope that it will be useful,</span>
<span class="comment">// but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<span class="comment">// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<span class="comment">// GNU Lesser General Public License for more details.</span>
<span class="comment">//</span>
<span class="comment">// You should have received a copy of the GNU Lesser General Public License</span>
<span class="comment">// along with GNU uCommon C++.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>

<span class="preprocessor">#ifndef DEBUG</span>
<span class="preprocessor"></span><span class="preprocessor">#define DEBUG</span>
<span class="preprocessor"></span><span class="preprocessor">#endif</span>
<span class="preprocessor"></span>
<span class="preprocessor">#include &lt;<a class="code" href="a00210.html" title="Top level include file for the GNU uCommon C++ core library.">ucommon/ucommon.h</a>&gt;</span>

<span class="preprocessor">#include &lt;stdio.h&gt;</span>

<span class="keyword">using namespace </span>UCOMMON_NAMESPACE;

<span class="keyword">typedef</span> linked_value&lt;int&gt; ints;

<span class="keyword">static</span> OrderedIndex list;

<span class="keyword">class </span>member : <span class="keyword">public</span> DLinkedObject
{
<span class="keyword">public</span>:
    <span class="keyword">inline</span> member(<span class="keywordtype">unsigned</span> v) : DLinkedObject() {value = v;}

    <span class="keywordtype">unsigned</span> value;
};

<span class="keyword">extern</span> <span class="stringliteral">&quot;C&quot;</span> <span class="keywordtype">int</span> main()
{
    linked_pointer&lt;ints&gt; ptr;
    <span class="keywordtype">unsigned</span> count = 0;
    <span class="comment">// Since value templates pass by reference, we must have referencable</span>
    <span class="comment">// objects or variables.  This avoids passing values by duplicating</span>
    <span class="comment">// objects onto the stack frame, though it causes problems for built-in</span>
    <span class="comment">// types...</span>
    <span class="keywordtype">int</span> xv = 3, xn = 5;
    ints v1(&amp;list, xv);
    ints v2(&amp;list);
    v2 = xn;

    ptr = &amp;list;
    <span class="keywordflow">while</span>(ptr) {
        <span class="keywordflow">switch</span>(++count)
        {
        <span class="keywordflow">case</span> 1:
            assert(ptr-&gt;value == 3);
            <span class="keywordflow">break</span>;
        <span class="keywordflow">case</span> 2:
            assert(ptr-&gt;value == 5);
        }
        ++ptr;
    }
    assert(count == 2);

    member ov1 = 1, ov2 = 2, ov3 = 3;

    assert(ov2.value == 2);

    <a name="a0"></a><a class="code" href="a00214.html#a2ff65e13fc62a4f5a56f9748bf5e5293" title="Convenience type for a stack of linked objects.">objstack_t</a> st;
    <a name="a1"></a><a class="code" href="a00214.html#ad3c146b0a18955ca36ae65ef8edacaa0" title="Push a linked object onto a stack of linked objects.">push</a>(st, &amp;ov1);
    <a class="code" href="a00214.html#ad3c146b0a18955ca36ae65ef8edacaa0" title="Push a linked object onto a stack of linked objects.">push</a>(st, &amp;ov2);
    <a class="code" href="a00214.html#ad3c146b0a18955ca36ae65ef8edacaa0" title="Push a linked object onto a stack of linked objects.">push</a>(st, &amp;ov3);

    member *mv = (member *)<a name="a2"></a><a class="code" href="a00214.html#a93aa1abad68882a73a88db1c6bc28064" title="Pop a linked object from a stack of linked objects.">pop</a>(st);
    assert(mv-&gt;value == 3);
    <a class="code" href="a00214.html#a93aa1abad68882a73a88db1c6bc28064" title="Pop a linked object from a stack of linked objects.">pop</a>(st);
    <a class="code" href="a00214.html#a93aa1abad68882a73a88db1c6bc28064" title="Pop a linked object from a stack of linked objects.">pop</a>(st);
    assert(NULL == <a class="code" href="a00214.html#a93aa1abad68882a73a88db1c6bc28064" title="Pop a linked object from a stack of linked objects.">pop</a>(st));

    objqueue&lt;member&gt; que;
    que.add(&amp;ov1);
    que.add(&amp;ov2);
    que.add(&amp;ov3);
    mv = que.pop();
    assert(mv-&gt;value == 3);
    mv = que.pull();
    assert(mv != NULL);
<span class="comment">//  assert(mv-&gt;value == 1);</span>

    <span class="keywordflow">return</span> 0;
}
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