<table><tr><td style="">ahmadsamir added inline comments.
</td><a style="text-decoration: none; padding: 4px 8px; margin: 0 8px 8px; float: right; color: #464C5C; font-weight: bold; border-radius: 3px; background-color: #F7F7F9; background-image: linear-gradient(to bottom,#fff,#f1f0f1); display: inline-block; border: 1px solid rgba(71,87,120,.2);" href="https://phabricator.kde.org/D23902">View Revision</a></tr></table><br /><div><strong>INLINE COMMENTS</strong><div><div style="margin: 6px 0 12px 0;"><div style="border: 1px solid #C7CCD9; border-radius: 3px;"><div style="padding: 0; background: #F7F7F7; border-color: #e3e4e8; border-style: solid; border-width: 0 0 1px 0; margin: 0;"><div style="color: #74777d; background: #eff2f4; padding: 6px 8px; overflow: hidden;"><a style="float: right; text-decoration: none;" href="https://phabricator.kde.org/D23902#inline-135335">View Inline</a><span style="color: #4b4d51; font-weight: bold;">dfaure</span> wrote in <span style="color: #4b4d51; font-weight: bold;">kcoredirlister.cpp:1044</span></div>
<div style="margin: 8px 0; padding: 0 12px; color: #74777D;"><p style="padding: 0; margin: 8px;">It's generally considered bad practice to return a const value, because the caller makes a copy anyway, so this doesn't guarantee anything. And it removes the benefits of rvalues that can be moved, since C++11.</p>
<p style="padding: 0; margin: 8px;">I can see how range-for actually benefits from this, though.</p>
<p style="padding: 0; margin: 8px;">It just seems that the generally agreed solution is to return non-const (for the other benefits) and use a local const variable as intermediary when using this in a range-for.</p></div></div>
<div style="margin: 8px 0; padding: 0 12px;"><p style="padding: 0; margin: 8px;">Noted.</p></div></div><br /><div style="border: 1px solid #C7CCD9; border-radius: 3px;"><div style="padding: 0; background: #F7F7F7; border-color: #e3e4e8; border-style: solid; border-width: 0 0 1px 0; margin: 0;"><div style="color: #74777d; background: #eff2f4; padding: 6px 8px; overflow: hidden;"><a style="float: right; text-decoration: none;" href="https://phabricator.kde.org/D23902#inline-135338">View Inline</a><span style="color: #4b4d51; font-weight: bold;">dfaure</span> wrote in <span style="color: #4b4d51; font-weight: bold;">kcoredirlister.cpp:1960</span></div>
<div style="margin: 8px 0; padding: 0 12px; color: #74777D;"><p style="padding: 0; margin: 8px;">const</p></div></div>
<div style="margin: 8px 0; padding: 0 12px;"><p style="padding: 0; margin: 8px;">(Note to self, "we need a copy" doesn't necessarily mean a non-const copy).</p></div></div><br /><div style="border: 1px solid #C7CCD9; border-radius: 3px;"><div style="padding: 0; background: #F7F7F7; border-color: #e3e4e8; border-style: solid; border-width: 0 0 1px 0; margin: 0;"><div style="color: #74777d; background: #eff2f4; padding: 6px 8px; overflow: hidden;"><a style="float: right; text-decoration: none;" href="https://phabricator.kde.org/D23902#inline-135340">View Inline</a><span style="color: #4b4d51; font-weight: bold;">dfaure</span> wrote in <span style="color: #4b4d51; font-weight: bold;">kcoredirlister.cpp:2073</span></div>
<div style="margin: 8px 0; padding: 0 12px; color: #74777D;"><p style="padding: 0; margin: 8px;"><tt style="background: #ebebeb; font-size: 13px;">holders.count()</tt>, to match what the orig code was doing</p></div></div>
<div style="margin: 8px 0; padding: 0 12px;"><p style="padding: 0; margin: 8px;">Ouch, right.</p></div></div><br /><div style="border: 1px solid #C7CCD9; border-radius: 3px;"><div style="padding: 0; background: #F7F7F7; border-color: #e3e4e8; border-style: solid; border-width: 0 0 1px 0; margin: 0;"><div style="color: #74777d; background: #eff2f4; padding: 6px 8px; overflow: hidden;"><a style="float: right; text-decoration: none;" href="https://phabricator.kde.org/D23902#inline-135341">View Inline</a><span style="color: #4b4d51; font-weight: bold;">dfaure</span> wrote in <span style="color: #4b4d51; font-weight: bold;">kcoredirlister.cpp:2222</span></div>
<div style="margin: 8px 0; padding: 0 12px; color: #74777D;"><p style="padding: 0; margin: 8px;">Why not just <tt style="background: #ebebeb; font-size: 13px;">qAsConst(listDirs)</tt>? Did you identify a risk that the body of the for loop modifies lstDirs?</p></div></div>
<div style="margin: 8px 0; padding: 0 12px;"><p style="padding: 0; margin: 8px;">I thought that way it doesn't get cast (with qAsConst) twice, as lstDirs is used in another for loop a couple of lines down. But I was wrong, qAsConst doesn't copy its arguments, so qAsConst is better suited.</p>
<p style="padding: 0; margin: 8px;">However this loop doesn't look like it modifies lstDirs.</p></div></div><br /><div style="border: 1px solid #C7CCD9; border-radius: 3px;"><div style="padding: 0; background: #F7F7F7; border-color: #e3e4e8; border-style: solid; border-width: 0 0 1px 0; margin: 0;"><div style="color: #74777d; background: #eff2f4; padding: 6px 8px; overflow: hidden;"><a style="float: right; text-decoration: none;" href="https://phabricator.kde.org/D23902#inline-135454">View Inline</a><span style="color: #4b4d51; font-weight: bold;">kcoredirlister.cpp:2237</span></div>
<div style="font: 11px/15px "Menlo", "Consolas", "Monaco", monospace; white-space: pre-wrap; clear: both; padding: 4px 0; margin: 0;"><div style="padding: 0 8px; margin: 0 4px; background: rgba(251, 175, 175, .7);"> <span class="bright"></span><span class="n"><span class="bright">Q_FOREACH</span></span> <span class="p">(</span><span style="color: #aa4000">const</span> <span class="n">QUrl</span> <span style="color: #aa2211">&</span><span class="n">dir<span class="bright"></span></span><span class="bright"></span><span class="p"><span class="bright">,</span></span><span class="bright"> </span><span class="n"><span class="bright">lstD</span>irs</span><span class="p">)</span> <span class="p">{</span>
</div><div style="padding: 0 8px; margin: 0 4px; background: rgba(151, 234, 151, .6);"> <span class="bright"></span><span style="color: #aa4000"><span class="bright">for</span></span> <span class="p">(</span><span style="color: #aa4000">const</span> <span class="n">QUrl</span> <span style="color: #aa2211">&</span><span style="color: #a0a000">dir<span class="bright"></span></span><span class="bright"> </span><span class="p"><span class="bright">:</span></span><span class="bright"> </span><span class="n"><span class="bright">d</span>irs</span><span class="p">)</span> <span class="p">{</span>
</div><div style="padding: 0 8px; margin: 0 4px; "> <span class="n">KFileItemList</span> <span class="n">deletedItems</span><span class="p">;</span>
</div></div></div>
<div style="margin: 8px 0; padding: 0 12px;"><p style="padding: 0; margin: 8px;">But this one might change lstDirs, as itemsDeleted is emitted, which calls deleteDir() and forgetDirs(); I am not sure though. I'll use a const var for this loop.</p></div></div></div></div></div><br /><div><strong>REPOSITORY</strong><div><div>R241 KIO</div></div></div><br /><div><strong>REVISION DETAIL</strong><div><a href="https://phabricator.kde.org/D23902">https://phabricator.kde.org/D23902</a></div></div><br /><div><strong>To: </strong>ahmadsamir, kde-frameworks-devel, dfaure<br /><strong>Cc: </strong>kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns<br /></div>