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<div class="">Bellow is an additional line which frees the filter, and thereby the output image, when only a raw auto pointer is used.</div>
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<div class="">On Mar 21, 2017, at 11:22 AM, Kiran Joshi <<a href="mailto:kiran.j88@gmail.com" class="">kiran.j88@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="">Hi Brad,
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<div class="">Thanks for correcting me.</div>
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<div class="">When I replace my AddImages() function with what's below, the memory for the<span class="inbox-inbox-Apple-converted-space"> </span><font face="monospace" class=""><b class="">result</b></font><span class="inbox-inbox-Apple-converted-space"> </span>image
still gets cleaned up automatically at the correct time.<br class="">
</div>
<div class="">Would you be able to give an example were the use of <font face="monospace" class="">
<b class="">auto</b></font> could lead to a memory leak? Since I guess I'm still not understanding the problem fully.</div>
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<div class="">Thanks,</div>
<div class="">Kiran</div>
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<div class="">
<div class=""><font face="monospace" class="">ImageType::Pointer AddImages(short a, short b) {</font></div>
<div class=""><font face="monospace" class=""> auto im1 = CreateImage(a);</font></div>
<div class=""><font face="monospace" class=""> auto im2 = CreateImage(b);</font></div>
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</font></div>
<div class=""><font face="monospace" class=""> AddFilterType::Pointer adder = AddFilterType::New();</font></div>
<div class=""><font face="monospace" class=""> adder->SetInput1(im1);</font></div>
<div class=""><font face="monospace" class=""> adder->SetInput2(im2);</font></div>
<div class=""><font face="monospace" class=""> adder->Update();</font></div>
<div class=""><font face="monospace" class=""> <b class=""> auto result = adder->GetOutput();</b></font></div>
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</font></div>
<div class=""><font face="monospace" class=""> AddFilterType::Pointer adder2 = AddFilterType::New();</font></div>
<div class=""><font face="monospace" class=""> adder2->SetInput1(im1);</font></div>
<div class=""><font face="monospace" class=""> adder2->SetInput2(result);</font></div>
<div class=""><font face="monospace" class=""> adder2->Update();</font></div>
<div class=""><font face="monospace" class=""> auto result2 = adder2->GetOutput();</font></div>
<div class=""><span class="Apple-tab-span" style="white-space:pre"><font face="monospace" class=""></font></span></div>
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<div><span class="Apple-tab-span" style="white-space:pre"></span> adder2 = ITK_NULLPTR;</div>
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<div class=""><font face="monospace" class=""> return result2;</font></div>
<div class=""><font face="monospace" class="">}</font></div>
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<div class="gmail_quote">
<div dir="ltr" class="">On Tue, 21 Mar 2017 at 14:59 Lowekamp, Bradley (NIH/NLM/LHC) [C] <<a href="mailto:blowekamp@mail.nih.gov" class="">blowekamp@mail.nih.gov</a>> wrote:<br class="">
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<div style="word-wrap:break-word" class="gmail_msg">Hello,
<div class="gmail_msg"><br class="gmail_msg">
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<div class="gmail_msg">Your code and description illustrates the problem with the implicit auto type.</div>
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<div class="gmail_msg">Based on this simple test I think that it is probably safe to use <font face="monospace" class="gmail_msg"><b class="gmail_msg">auto</b></font> to store the output from filters. It does not look like it interferes with the reference counting
or leads to memory leaks, as Yann was worried about.</div>
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<div class="gmail_msg">This can be problematic:</div>
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<div class="gmail_msg"> auto testOutput = testFilter->GetOutput();</div>
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<div class="gmail_msg">But that is not what you are doing in your example. When you use the “auto” type you need to be careful to determine if the type is a raw pointer or a smart pointer. The GetOutput methods returns an raw pointer without reference counting.
This is the type auto is above.</div>
<div class="gmail_msg"><br class="gmail_msg">
</div>
<div class="gmail_msg">However in your example the return type for your method is ImageType::Pointer, which is an ITK smart pointer. Your code adds an implicit cast for the raw pointer to ITK’s smart pointer. And this is not made clear by the usage of auto.</div>
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<div class="gmail_msg">HTH,</div>
<div class="gmail_msg">Brad</div>
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<div class="gmail_msg">On Mar 21, 2017, at 10:49 AM, Kiran Joshi <<a href="mailto:kiran.j88@gmail.com" class="gmail_msg" target="_blank">kiran.j88@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="gmail_msg">Hi Francois,
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<div class="gmail_msg">Maybe I misunderstood, but I disagree with your statement that "you cannot use the keyword auto with these other methods"</div>
<div class="gmail_msg"><br class="gmail_msg">
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<div class="gmail_msg">Attached is a screenshot showing a small ITK test program in a Visual Studio debugging session. </div>
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<div class="gmail_msg">The program is very simple; an AddImages() function is called, which itself calls a CreateImage() function twice before adding the created images and returning the result.</div>
<div class="gmail_msg">Note that I have used <font face="monospace" class="gmail_msg">
<b class="gmail_msg">auto</b></font> when storing the image pointers returned by the CreateImage and AddImage functions.</div>
<div class="gmail_msg"><br class="gmail_msg">
</div>
<div class="gmail_msg">On the right of the image you can see snapshots of the memory usage as the program executes, and I have also annotated which lines of the program were executed immediately before taking the snapshot.</div>
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<div class="gmail_msg">The first snapshot show that on line 22, very little memory has been allocated, since we have not yet created any images.</div>
<div class="gmail_msg">On line 23 ~16MB of memory is used when the first image is created.</div>
<div class="gmail_msg">On line 24 ~32MB is used after the 2nd image is created.</div>
<div class="gmail_msg">On line 30 the two images are added together and the result is returned from the function. At this point ~48MB is used because all 3 image still exist in memory.</div>
<div class="gmail_msg">On line 31 we exit from the AddImages() function and can see that the memory for two temporary images has been correctly deallocated, since the
<font face="monospace" class="gmail_msg"><b class="gmail_msg">im1</b></font> and <font face="monospace" class="gmail_msg">
<b class="gmail_msg">im2</b></font> pointers have gone out of scope.</div>
<div class="gmail_msg">Finally on line 38 we exit the main() function and see that the memory usage returns to ~0MB, since the
<font face="monospace" class="gmail_msg"><b class="gmail_msg">image</b></font> variable also goes out of scope and the memory associated with it is deallocated.</div>
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<div class="gmail_msg">Let me know if you see any mistakes in my tests!</div>
<div class="gmail_msg">Kiran</div>
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<div dir="ltr" class="gmail_msg"><span id="m_-7466972166993527894cid:15af1551a065f63678a1" class="gmail_msg"><ITKPointerTest.png></span>
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<div dir="ltr" class="gmail_msg">On Tue, 21 Mar 2017 at 12:38 Francois Budin <<a href="mailto:francois.budin@kitware.com" class="gmail_msg" target="_blank">francois.budin@kitware.com</a>> wrote:<br class="gmail_msg">
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<div class="gmail_msg">Hello Yann,<br class="gmail_msg">
<br class="gmail_msg">
</div>
Indeed, you are correct. New() will return a smart pointer, but other methods will return a pointer, so you cannot use the keyword "auto" with these other methods.<br class="gmail_msg">
</div>
The two following links give some insight in why ITK is implemented this way:<br class="gmail_msg">
<a href="https://itk.org/Wiki/ITK/Examples/Utilities/ReturnObjectFromFunction" class="gmail_msg" target="_blank">https://itk.org/Wiki/ITK/Examples/Utilities/ReturnObjectFromFunction</a><br class="gmail_msg">
<a href="https://itk.org/pipermail/insight-developers/2011-April/018011.html" class="gmail_msg" target="_blank">https://itk.org/pipermail/insight-developers/2011-April/018011.html</a><br class="gmail_msg">
<br class="gmail_msg">
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Hope this helps,<br class="gmail_msg">
</div>
Francois<br class="gmail_msg">
</div>
<div class="gmail_extra gmail_msg"><br class="gmail_msg">
<div class="gmail_quote gmail_msg">On Tue, Mar 21, 2017 at 6:45 AM, asertyuio via Insight-users
<span dir="ltr" class="gmail_msg"><<a href="mailto:insight-users@itk.org" class="gmail_msg" target="_blank">insight-users@itk.org</a>></span> wrote:<br class="gmail_msg">
<blockquote class="gmail_quote gmail_msg" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p style="margin:0px 0px 1.2em!important" class="gmail_msg">Hi Hans,</p>
<p style="margin:0px 0px 1.2em!important" class="gmail_msg">Thanks for your answer !</p>
<p style="margin:0px 0px 1.2em!important" class="gmail_msg">I was asking that because when I use auto keyword with a filter output, it seems like is result in a normal point type, not a smart pointer, so a code with</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px" class="gmail_msg"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre-wrap;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important" class="gmail_msg">auto testOutput = testFilter->GetOutput();
</code></pre>
<p style="margin:0px 0px 1.2em!important" class="gmail_msg">has not the same behavior as</p>
<pre style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px" class="gmail_msg"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline;white-space:pre-wrap;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important" class="gmail_msg"> FilterOutputType::Pointer testOutput = testFilter->GetOutput();
</code></pre>
<p style="margin:0px 0px 1.2em!important" class="gmail_msg"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline" class="gmail_msg">testOutput</code>
is a smart pointer in the second case, and a normal pointer in the first one.</p>
<p style="margin:0px 0px 1.2em!important" class="gmail_msg">I was wondering if it could interfere with the smart pointer role (for example causing memory leak, or wrong reference count).</p>
<p style="margin:0px 0px 1.2em!important" class="gmail_msg">After a deeper look, <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline" class="gmail_msg">
New()</code> return a smart pointer (so with auto =, no problem) and <code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;padding:0px 0.3em;white-space:pre-wrap;border:1px solid rgb(234,234,234);background-color:rgb(248,248,248);border-radius:3px;display:inline" class="gmail_msg">
GetOutput()</code> a pointer. So the second code snipset just creates another instance of a smart pointer.</p>
<p style="margin:0px 0px 1.2em!important" class="gmail_msg">I hope what was my question is now clearer !<br class="gmail_msg">
Yann</p>
<span class="gmail_msg">
<p style="margin:0px 0px 1.2em!important" class="gmail_msg">Le 21/03/2017 à 01:43, Johnson, Hans J a écrit :</p>
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<blockquote type="cite" class="gmail_msg">
<pre class="gmail_msg">Yann,
It will work only if you are compiling with C++11, and you have no intention of sharing your code with others who may not use C++11 syntax.
ITK proper currently maintains backwards compatibility with older versions of C++.
Hans
</pre>
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