• ChengWei <rivercheng gmail.com> Sep 14 2011

ChengWei <rivercheng gmail.com> writes:

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In concurrency.d (version 2.055, line 1247 - 1250) , there's some codes
related to internal implementation of List(T).

"
 Range opSlice()
        {
            return Range( cast(Node*) &m_first );
        }
"

What does this mean? m_first itself is Node *, then &m_first is Node **,
then we cast it back to (Node *)? Does it make sense?

If we change "&m_first" to "m_first", it still is weird, because in line
1169:
"
  property bool empty() const
            {
                return !m_prev.next;
            }
"

The list is empty when m_first is null, that is m_prev is null, not
m_prev.next is null.

Is my understanding of these codes completely wrong, or it is a bug in the
code?

Thanks.

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<div>In concurrency.d (version 2.055, line 1247 - 1250) , there&#39;s some =
codes related to internal implementation of List(T).=A0</div><div><br></div=
<div>&quot;</div><div>=A0Range opSlice()</div><div>=A0 =A0 =A0 =A0 {</div>=




<div>=A0 =A0 =A0 =A0 }</div><div>&quot;</div><div><br></div><div>What does =
this mean? m_first itself is Node *, then &amp;m_first is Node **, then we =
cast it back to (Node *)? Does it make sense?</div><div><br></div><div>If w=
e change &quot;&amp;m_first&quot; to &quot;m_first&quot;, it still is weird=
, because in line 1169:</div>

<div><div>&quot;</div><div>=A0 property bool empty() const</div><div>=A0 =
=A0 =A0 =A0 =A0 =A0 {</div><div>=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 return !m_p=
rev.next;</div><div>=A0 =A0 =A0 =A0 =A0 =A0 }</div></div><div>&quot;</div><=
div><br></div><div>The list is empty when m_first is null, that is m_prev i=
s null, not m_prev.next is null.=A0</div>

<div><br></div><div>Is my understanding of these codes completely wrong, or=
 it is a bug in the code?</div><div><br></div><div>Thanks.</div><div><br></=
div><div><br></div>

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