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Abhishek wrote:
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<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">When I use: <o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">std::auto_ptr<vtkTIFFReader>
m_pImgReader;<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">as a member variable in
my class I get the following
compiler (MSVC) error:<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;">…\memory(484): error C2248:
'vtkTIFFReader::vtkTIFFReader' :
cannot access protected member declared in class 'vtkTIFFReader'.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span
style="font-size: 12pt;">Can someone throw light as to why this is
happening? Thanks,</span></font></p>
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</blockquote>
VTK objects already have "auto_ptr style semantics." For raw pointer
usage, the expected usage is to call <b>vtkTIFFReader::New</b> and
then call <b>Delete</b> on the returned pointer when you're done.
(Note the captial letters in <b>New</b> and <b>Delete</b>.) To keep
folks from bypassing the VTK object ref counting mechanism, the default
constructors and the destructors of VTK objects are protected. So using
std::auto_ptr would be a mistake and the compiler has prevented you
from making it in this case...<br>
<br>
See also the class "<b>vtkSmartPointer</b>" found in
VTK/Common/vtkSmartPointer.h... It's VTK's equivalent to std::auto_ptr,
so you can usually just call <b>New</b> and forget about it.<br>
<br>
HTH,<br>
Dave<br>
<br>
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