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<div class="moz-cite-prefix">Le 05/07/2022 à 23:35,
<a class="moz-txt-link-abbreviated" href="mailto:Bart.Duijndam@ziggo.nl">Bart.Duijndam@ziggo.nl</a> a écrit :<br>
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<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US">Hi Even,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US">Thanks for your help; you’re working late…<o:p></o:p></span></p>
<p><span style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US">Please be advised that I already started with
using </span><span
style="font-size:9.5pt;font-family:Consolas;color:black">nn_dynamic_pointer_cast<ProjectedCRS>(crs);</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US">But then I got the following obscure error
message:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"
style="margin-left:36.0pt;text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:black">D:\Source\VS19\PROJ\test\unit\test_crs.cpp(5516):
error C2280:
'dropbox::oxygen::nn<osgeo::proj::crs::ProjectedCRSPtr>::nn(PtrType)':
attempting to reference a deleted function<o:p></o:p></span></p>
<p class="MsoNormal"
style="margin-left:36.0pt;text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:black">
with<o:p></o:p></span></p>
<p class="MsoNormal"
style="margin-left:36.0pt;text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:black">
[<o:p></o:p></span></p>
<p class="MsoNormal"
style="margin-left:36.0pt;text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:black">
PtrType=osgeo::proj::crs::ProjectedCRSPtr<o:p></o:p></span></p>
<p class="MsoNormal"
style="margin-left:36.0pt;text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:black">
]<o:p></o:p></span></p>
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style="margin-left:36.0pt;text-autospace:none"><span
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D:\Source\VS19\PROJ\include\proj\nn.hpp(126): note: see
declaration of
'dropbox::oxygen::nn<osgeo::proj::crs::ProjectedCRSPtr>::nn'<o:p></o:p></span></p>
<p class="MsoNormal"
style="margin-left:36.0pt;text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:black">
D:\Source\VS19\PROJ\include\proj\nn.hpp(126): note:
'dropbox::oxygen::nn<osgeo::proj::crs::ProjectedCRSPtr>::nn(PtrType)':
function was explicitly deleted<o:p></o:p></span></p>
<p class="MsoNormal"
style="margin-left:36.0pt;text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:black">
with<o:p></o:p></span></p>
<p class="MsoNormal"
style="margin-left:36.0pt;text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:black">
[<o:p></o:p></span></p>
<p class="MsoNormal"
style="margin-left:36.0pt;text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:black">
PtrType=osgeo::proj::crs::ProjectedCRSPtr<o:p></o:p></span></p>
<p class="MsoNormal"
style="margin-left:36.0pt;text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:black">
]<o:p></o:p></span></p>
<p class="MsoNormal"
style="margin-left:36.0pt;text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:black">
ninja: build stopped: subcommand failed.<o:p></o:p></span></p>
<p class="MsoNormal"
style="margin-left:36.0pt;text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:36.0pt"><span
style="font-size:9.5pt;font-family:Consolas;color:black">Build
All failed.</span></p>
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<p>Ah I see, the issue is that
nn_dynamic_pointer_cast<ProjectedCRS> returns a
ProjectedCRSPtr (which is a typedef for
std::shared_ptr<ProjectedCRS>), which is potentially null
(because nn_dynamic_pointer_cast<> might fail and return a
null pointer). Whereas your function signature returns a
ProjectedCRSNNPtr, which is an alias for nn<ProjectedCRSPtr>,
that is a ProjectedCRSPtr that cannot be null. The conversion from
ProjectedCRSPtr to nn<ProjectedCRSPtr> must be explicit, so
you should typically modify the return statement to be return
NN_CHECK_ASSERT(proj_crs);<br>
</p>
<p><br>
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cite="mid:004901d890b7$3240c4b0$96c24e10$@ziggo.nl">
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<p class="MsoNormal" style="margin-left:36.0pt"><span
style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US">So that’s why I tried </span><span
style="font-size:9.5pt;font-family:Consolas;color:#2B91AF">ProjectedCRSNNPtr</span><span
style="color:#1F497D;mso-fareast-language:EN-US"> <span
lang="EN-US">instead</span></span></p>
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That would leak to a shared pointer of a null-nullable shared
pointer. Definitely not something you want.<br>
<blockquote type="cite"
cite="mid:004901d890b7$3240c4b0$96c24e10$@ziggo.nl">
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<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"><span
lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US">Bart<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="color:#1F497D;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span
lang="EN-US"> Even Rouault
<a class="moz-txt-link-rfc2396E" href="mailto:even.rouault@spatialys.com"><even.rouault@spatialys.com></a> <br>
<b>Sent:</b> Tuesday, 5 July 2022 23:30<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:Bart.Duijndam@ziggo.nl">Bart.Duijndam@ziggo.nl</a>; <a class="moz-txt-link-abbreviated" href="mailto:proj@lists.osgeo.org">proj@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [PROJ] Affine transformation using
DERIVEDPROJCRS<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
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<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:36.0pt;text-autospace:none"><span
style="font-size:9.5pt;font-family:Consolas;color:black">
</span><span
style="font-size:9.5pt;font-family:Consolas;color:blue">auto</span><span
style="font-size:9.5pt;font-family:Consolas;color:black">
proj_crs = nn_dynamic_pointer_cast<</span><span
style="font-size:9.5pt;font-family:Consolas;color:#2B91AF">ProjectedCRSNNPtr</span><span
style="font-size:9.5pt;font-family:Consolas;color:black">>(crs);</span><o:p></o:p></p>
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<p>==> <span
style="font-size:9.5pt;font-family:Consolas;color:blue">auto</span><span
style="font-size:9.5pt;font-family:Consolas;color:black">
proj_crs = nn_dynamic_pointer_cast<ProjectedCRS>(crs);</span><o:p></o:p></p>
<pre>-- <o:p></o:p></pre>
<pre><a href="http://www.spatialys.com" moz-do-not-send="true" class="moz-txt-link-freetext">http://www.spatialys.com</a><o:p></o:p></pre>
<pre>My software is free, but my time generally not.<o:p></o:p></pre>
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<pre class="moz-signature" cols="72">--
<a class="moz-txt-link-freetext" href="http://www.spatialys.com">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
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