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List:       pykde
Subject:    [PyQt] another question with template inheritance
From:       Denis Rouzaud <denis.rouzaud () gmail ! com>
Date:       2017-05-22 13:02:15
Message-ID: CAMtsY+Zmqcw522c836xTkwDJNGHzLOG+1Q2rydYMXOOnvVNS7w () mail ! gmail ! com
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Dear all,

I have another issue with template based inheritance.

Let's say I have the header

template <typename T>

class QgsTemporalRange

{

  public:

    QgsTemporalRange( const T &begin = T(), const T &end = T() );

};


typedef QgsTemporalRange< QDate > QgsDateRange;



And the SIP file:


template <T>

class QgsTemporalRange

{

%TypeHeaderCode
#include "qgsrange.h"
%End

public:

    QgsTemporalRange( const T &begin = T(), const T &end = T() );

};


typedef QgsTemporalRange< QDate > QgsDateRange;



I get the following error in the generated cpp code in

static void *init_type_QgsDateRange(sipSimpleWrapper *, PyObject
*sipArgs, PyObject *sipKwds, PyObject **sipUnused, PyObject **,
PyObject **sipParseErr)

at line:

const QDate& a0def = T();

:: error: use of undeclared identifier 'T'


I gave it a try by using classes instead of typedef (as described in
[0]) but it leads to exactly the same error (which is logic I guess).

Any idea how to solve this?


Thanks a lot,

Denis



[0] https://www.riverbankcomputing.com/pipermail/pyqt/2017-May/039188.html

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<div dir="ltr">Dear all,<div><br></div><div>I have another issue with template based \
inheritance.</div><div><br></div><div>Let&#39;s say I have the \
header</div><div><br></div><div><pre style="margin-top:0px;margin-bottom:0px"><span \
style="color:rgb(128,128,0)">template</span><span style="color:rgb(192,192,192)"> \
</span>&lt;<span style="color:rgb(128,128,0)">typename</span><span \
style="color:rgb(192,192,192)"> </span><span \
style="color:rgb(128,0,128)">T</span>&gt;</pre> <pre \
style="margin-top:0px;margin-bottom:0px"><span \
style="color:rgb(128,128,0)">class</span><span style="color:rgb(192,192,192)"> \
</span><span style="color:rgb(128,0,128)">QgsTemporalRange</span></pre> <pre \
style="margin-top:0px;margin-bottom:0px">{</pre> <pre \
style="margin-top:0px;margin-bottom:0px">  <span \
style="font-family:sans-serif;color:rgb(128,128,0)">public</span><span \
style="font-family:sans-serif">:</span></pre> <pre \
style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)">    \
</span><span style="color:rgb(128,0,128)">QgsTemporalRange</span>(<span \
style="color:rgb(192,192,192)"> </span><span \
style="color:rgb(128,128,0)">const</span><span style="color:rgb(192,192,192)"> \
</span><span style="color:rgb(128,0,128)">T</span><span \
style="color:rgb(192,192,192)"> </span>&amp;begin<span \
style="color:rgb(192,192,192)"> </span>=<span style="color:rgb(192,192,192)"> \
</span><span style="color:rgb(128,0,128)">T</span>(),<span \
style="color:rgb(192,192,192)"> </span><span \
style="color:rgb(128,128,0)">const</span><span style="color:rgb(192,192,192)"> \
</span><span style="color:rgb(128,0,128)">T</span><span \
style="color:rgb(192,192,192)"> </span>&amp;end<span style="color:rgb(192,192,192)"> \
</span>=<span style="color:rgb(192,192,192)"> </span><span \
style="color:rgb(128,0,128)">T</span>() );</pre><pre \
style="margin-top:0px;margin-bottom:0px">};</pre><pre \
style="margin-top:0px;margin-bottom:0px"><br></pre><pre \
style="margin-top:0px;margin-bottom:0px"><span \
style="color:rgb(128,128,0)">typedef</span><span style="color:rgb(192,192,192)"> \
</span><span style="color:rgb(128,0,128)">QgsTemporalRange</span>&lt;<span \
style="color:rgb(192,192,192)"> </span><span \
style="color:rgb(128,0,128)">QDate</span><span style="color:rgb(192,192,192)"> \
</span>&gt;<span style="color:rgb(192,192,192)"> </span><span \
style="color:rgb(128,0,128)">QgsDateRange</span>;</pre><pre \
style="margin-top:0px;margin-bottom:0px"><br></pre><pre \
style="margin-top:0px;margin-bottom:0px"><br></pre><pre \
style="margin-top:0px;margin-bottom:0px">And the SIP file:</pre><pre \
style="margin-top:0px;margin-bottom:0px"><br></pre><pre \
style="margin-top:0px;margin-bottom:0px"><pre \
style="margin-top:0px;margin-bottom:0px"><span \
style="color:rgb(128,128,0)">template</span><span style="color:rgb(192,192,192)"> \
</span>&lt;<span style="color:rgb(128,0,128)">T</span>&gt;</pre><pre \
style="margin-top:0px;margin-bottom:0px"><span \
style="color:rgb(128,128,0)">class</span><span style="color:rgb(192,192,192)"> \
</span><span style="color:rgb(128,0,128)">QgsTemporalRange</span></pre><pre \
style="margin-top:0px;margin-bottom:0px">{</pre><pre \
style="margin-top:0px;margin-bottom:0px">%TypeHeaderCode #include \
&quot;qgsrange.h&quot; %End
</pre><div><span style="font-family:sans-serif">  </span><span \
style="font-family:sans-serif;color:rgb(128,128,0)">public</span><span \
style="font-family:sans-serif">:</span><br></div><pre \
style="margin-top:0px;margin-bottom:0px"><span style="color:rgb(192,192,192)">    \
</span><span style="color:rgb(128,0,128)">QgsTemporalRange</span>(<span \
style="color:rgb(192,192,192)"> </span><span \
style="color:rgb(128,128,0)">const</span><span style="color:rgb(192,192,192)"> \
</span><span style="color:rgb(128,0,128)">T</span><span \
style="color:rgb(192,192,192)"> </span>&amp;begin<span \
style="color:rgb(192,192,192)"> </span>=<span style="color:rgb(192,192,192)"> \
</span><span style="color:rgb(128,0,128)">T</span>(),<span \
style="color:rgb(192,192,192)"> </span><span \
style="color:rgb(128,128,0)">const</span><span style="color:rgb(192,192,192)"> \
</span><span style="color:rgb(128,0,128)">T</span><span \
style="color:rgb(192,192,192)"> </span>&amp;end<span style="color:rgb(192,192,192)"> \
</span>=<span style="color:rgb(192,192,192)"> </span><span \
style="color:rgb(128,0,128)">T</span>() );</pre><pre \
style="margin-top:0px;margin-bottom:0px">};</pre><pre \
style="margin-top:0px;margin-bottom:0px"><br></pre><pre \
style="margin-top:0px;margin-bottom:0px"><span \
style="color:rgb(128,128,0)">typedef</span><span style="color:rgb(192,192,192)"> \
</span><span style="color:rgb(128,0,128)">QgsTemporalRange</span>&lt;<span \
style="color:rgb(192,192,192)"> </span><span \
style="color:rgb(128,0,128)">QDate</span><span style="color:rgb(192,192,192)"> \
</span>&gt;<span style="color:rgb(192,192,192)"> </span><span \
style="color:rgb(128,0,128)">QgsDateRange</span>;</pre><pre \
style="margin-top:0px;margin-bottom:0px"><br></pre><pre \
style="margin-top:0px;margin-bottom:0px"><br></pre><pre \
style="margin-top:0px;margin-bottom:0px">I get the following error in the generated \
cpp code in </pre><pre style="margin-top:0px;margin-bottom:0px">static void \
*init_type_QgsDateRange(sipSimpleWrapper *, PyObject *sipArgs, PyObject *sipKwds, \
PyObject **sipUnused, PyObject **, PyObject **sipParseErr)<br></pre><pre \
style="margin-top:0px;margin-bottom:0px">at line:<br></pre><pre \
style="margin-top:0px;margin-bottom:0px">const QDate&amp; a0def = T();</pre><pre \
style="margin-top:0px;margin-bottom:0px">:: error: use of undeclared identifier \
&#39;T&#39;<br></pre></pre><pre \
style="margin-top:0px;margin-bottom:0px"><br></pre><pre \
style="margin-top:0px;margin-bottom:0px">I gave it a try by using classes instead of \
typedef (as described in [0]) but it leads to exactly the same error (which is logic \
I guess).<br></pre><pre style="margin-top:0px;margin-bottom:0px">Any idea how to \
solve this?</pre><pre style="margin-top:0px;margin-bottom:0px"><br></pre><pre \
style="margin-top:0px;margin-bottom:0px">Thanks a lot,</pre><pre \
style="margin-top:0px;margin-bottom:0px">Denis</pre><pre \
style="margin-top:0px;margin-bottom:0px"><br></pre><pre \
style="margin-top:0px;margin-bottom:0px"><br></pre><pre \
style="margin-top:0px;margin-bottom:0px">[0] <a \
href="https://www.riverbankcomputing.com/pipermail/pyqt/2017-May/039188.html">https://www.riverbankcomputing.com/pipermail/pyqt/2017-May/039188.html</a></pre><pre \
style="margin-top:0px;margin-bottom:0px"><br></pre></div></div>


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