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Subject: Re: Compile error with areaDetector
From: Mark Rivers <rivers@cars.uchicago.edu>
To: "Dreyer, Dr. Joern" <j.dreyer@hzdr.de>, "tech-talk@aps.anl.gov" <tech-talk@aps.anl.gov>
Date: Wed, 15 Nov 2017 12:42:48 +0000
Hi Jörn,


I don't have experience with gcc 5.4.0.  But you say you are also getting an error with gcc 4.8.  I am running gcc 4.8.5


gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-16)


and ntndArrayConverter.cpp compiles fine for me with that compiler.  Exactly which version of gcc 4.8 is failing for you?


Mark



________________________________
From: tech-talk-bounces@aps.anl.gov <tech-talk-bounces@aps.anl.gov> on behalf of Dreyer, Dr. Joern <j.dreyer@hzdr.de>
Sent: Wednesday, November 15, 2017 1:26 AM
To: tech-talk@aps.anl.gov
Subject: Compile error with areaDetector

Hi,

I have run into a problem with areaDetector compilation when enabling EPICS4
using version 4.6.0 on Ubuntu16.04.3 LTS.

../ntndArrayConverter.cpp: In member function ‘void
NTNDArrayConverter::fromUndefinedAttribute(epics::pvData::PVStructurePtr)’:
../ntndArrayConverter.cpp:497:54: error: no matching function for call to
‘std::tr1::shared_ptr<epics::pvData::PVField>::reset() const’
   dest->getSubField<PVUnion>("value")->get().reset();
   ^
In file included from /usr/include/c++/5/tr1/memory:50:0,
   from
/home/wuestenf/EPICS/EPICS-3.15.5/EPICS-CPP-4.6.0/pvDataCPP/include/pv/sharedPtr.h:124,
   from
/home/wuestenf/EPICS/EPICS-3.15.5/EPICS-CPP-4.6.0/pvDataCPP/include/pv/pvType.h:41,
   from
/home/wuestenf/EPICS/EPICS-3.15.5/EPICS-CPP-4.6.0/pvDataCPP/include/pv/pvDisplay.h:14,
   from
/home/wuestenf/EPICS/EPICS-3.15.5/EPICS-CPP-4.6.0/normativeTypesCPP/include/pv/ntndarray.h:17,
   from ../ntndArrayConverter.h:2,
   from ../ntndArrayConverter.cpp:4:
/usr/include/c++/5/tr1/shared_ptr.h:644:7: note: candidate: void
std::tr1::__shared_ptr<_Tp, _Lp>::reset() [with _Tp =
epics::pvData::PVField; __gnu_cxx::_Lock_policy _Lp =
(__gnu_cxx::_Lock_policy)2u] <near match>
   reset() // never throws
   ^
/usr/include/c++/5/tr1/shared_ptr.h:644:7: note:  passing ‘const PVFieldPtr*
{aka const std::tr1::shared_ptr<epics::pvData::PVField>*}’ as ‘this’
argument discards qualifiers
/usr/include/c++/5/tr1/shared_ptr.h:649:9: note: candidate: template<class
_Tp1> void std::tr1::__shared_ptr<_Tp, _Lp>::reset(_Tp1*) [with _Tp1 = _Tp1;
_Tp = epics::pvData::PVField; __gnu_cxx::_Lock_policy _Lp =
(__gnu_cxx::_Lock_policy)2u]
   reset(_Tp1* __p) // _Tp1 must be complete.
   ^
/usr/include/c++/5/tr1/shared_ptr.h:649:9: note:  template argument
deduction/substitution failed:
../ntndArrayConverter.cpp:497:54: note:  candidate expects 1 argument, 0
provided
   dest->getSubField<PVUnion>("value")->get().reset();
   ^
In file included from /usr/include/c++/5/tr1/memory:50:0,
   from
/home/wuestenf/EPICS/EPICS-3.15.5/EPICS-CPP-4.6.0/pvDataCPP/include/pv/sharedPtr.h:124,
   from
/home/wuestenf/EPICS/EPICS-3.15.5/EPICS-CPP-4.6.0/pvDataCPP/include/pv/pvType.h:41,
   from
/home/wuestenf/EPICS/EPICS-3.15.5/EPICS-CPP-4.6.0/pvDataCPP/include/pv/pvDisplay.h:14,
   from
/home/wuestenf/EPICS/EPICS-3.15.5/EPICS-CPP-4.6.0/normativeTypesCPP/include/pv/ntndarray.h:17,
   from ../ntndArrayConverter.h:2,
   from ../ntndArrayConverter.cpp:4:
/usr/include/c++/5/tr1/shared_ptr.h:658:9: note: candidate: template<class
_Tp1, class _Deleter> void std::tr1::__shared_ptr<_Tp, _Lp>::reset(_Tp1*,
_Deleter) [with _Tp1 = _Tp1; _Deleter = _Deleter; _Tp =
epics::pvData::PVField; __gnu_cxx::_Lock_policy _Lp =
(__gnu_cxx::_Lock_policy)2u]
   reset(_Tp1* __p, _Deleter __d)
   ^
/usr/include/c++/5/tr1/shared_ptr.h:658:9: note:  template argument
deduction/substitution failed:
../ntndArrayConverter.cpp:497:54: note:  candidate expects 2 arguments, 0
provided
   dest->getSubField<PVUnion>("value")->get().reset();

The used gcc version is 5.4.0. On Ubuntu 14.04.5 LTS The error comes at the
same line, but different problem:

../ntndArrayConverter.cpp: In member function ‘void
NTNDArrayConverter::fromUndefinedAttribute(epics::pvData::PVStructurePtr)’:
../ntndArrayConverter.cpp:497:54: error: passing ‘const PVFieldPtr {aka
const std::tr1::shared_ptr<epics::pvData::PVField>}’ as ‘this’ argument of
‘void std::tr1::__shared_ptr<_Tp, _Lp>::reset() [with _Tp =
epics::pvData::PVField; __gnu_cxx::_Lock_policy _Lp =
(__gnu_cxx::_Lock_policy)2u]’ discards qualifiers [-fpermissive]
   dest->getSubField<PVUnion>("value")->get().reset();

here the used gcc version is 4.8. It look like an explicit typecast is
necessary here. But what would be the correct type?

Regards,

Jörn

Replies:
Re: Compile error with areaDetector Jörn Dreyer
References:
Compile error with areaDetector Dreyer, Dr. Joern

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