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c++poco-libraries

const pointer on Poco::AutoPtr

Try work const pointers with AutoPtr:

void LiveTimeConfig::setup(const AbstractConfiguration& cfg){
    GetLogger().information("LiveTimeConfig::setup(): init data");
    Poco::AutoPtr<const AbstractConfiguration> view = 
    cfg.createView("live_time");
    try {
       readExist(view, Field::Token, _token);
       readExist(view, Field::Solt, _solt);
    } catch (Poco::SyntaxException& ) {
         GetLogger().error("LiveTimeConfig::setup(): bad values");
         throw Poco::RuntimeException("LiveTimeConfig::setup(): invalid format");
    }
}

But I have error on comparison operator.

../../../build/pc/include/Poco/AutoPtr.h: In instantiation of ‘class Poco::AutoPtr<const Poco::Util::AbstractConfiguration>’: src/LiveTimeConfig.cpp:27:54:   required from here ../../../../build/pc/include/Poco/AutoPtr.h:263:7: error: ‘bool Poco::AutoPtr<C>::operator==(C*) const [with C = const Poco::Util::AbstractConfiguration]’ cannot be overloaded   bool operator == (C* ptr) const
       ^ ../../../../build/pc/include/Poco/AutoPtr.h:258:7: error: with ‘bool Poco::AutoPtr<C>::operator==(const C*) const [with C = const Poco::Util::AbstractConfiguration]’   bool operator == (const C* ptr) const
       ^ ../../../../build/pc/include/Poco/AutoPtr.h:278:7: error: ‘bool Poco::AutoPtr<C>::operator!=(C*) const [with C = const Poco::Util::AbstractConfiguration]’ cannot be overloaded   bool operator != (C* ptr) const
       ^ ../../../../build/pc/include/Poco/AutoPtr.h:273:7: error: with ‘bool Poco::AutoPtr<C>::operator!=(const C*) const [with C = const Poco::Util::AbstractConfiguration]’   bool operator != (const C* ptr) const
       ^ ../../../../build/pc/include/Poco/AutoPtr.h:293:7: error: ‘bool Poco::AutoPtr<C>::operator<(C*) const [with C = const Poco::Util::AbstractConfiguration]’ cannot be overloaded   bool operator < (C* ptr) const
       ^ ../../../../build/pc/include/Poco/AutoPtr.h:288:7: error: with ‘bool Poco::AutoPtr<C>::operator<(const C*) const [with C = const Poco::Util::AbstractConfiguration]’   bool operator < (const C* ptr) const
       ^ ../../../../build/pc/include/Poco/AutoPtr.h:308:7: error: ‘bool Poco::AutoPtr<C>::operator<=(C*) const [with C = const Poco::Util::AbstractConfiguration]’ cannot be overloaded   bool operator <= (C* ptr) const
       ^ ../../../../build/pc/include/Poco/AutoPtr.h:303:7: error: with ‘bool Poco::AutoPtr<C>::operator<=(const C*) const [with C = const Poco::Util::AbstractConfiguration]’   bool operator <= (const C* ptr) const
       ^ ../../../../build/pc/include/Poco/AutoPtr.h:323:7: error: ‘bool Poco::AutoPtr<C>::operator>(C*) const [with C = const Poco::Util::AbstractConfiguration]’ cannot be overloaded   bool operator > (C* ptr) const
       ^ ../../../../build/pc/include/Poco/AutoPtr.h:318:7: error: with ‘bool Poco::AutoPtr<C>::operator>(const C*) const [with C = const Poco::Util::AbstractConfiguration]’   bool operator > (const C* ptr) const
       ^ ../../../../build/pc/include/Poco/AutoPtr.h:338:7: error: ‘bool Poco::AutoPtr<C>::operator>=(C*) const [with C = const Poco::Util::AbstractConfiguration]’ cannot be overloaded   bool operator >= (C* ptr) const
       ^ ../../../../build/pc/include/Poco/AutoPtr.h:333:7: error: with ‘bool Poco::AutoPtr<C>::operator>=(const C*) const [with C = const Poco::Util::AbstractConfiguration]’   bool operator >= (const C* ptr) const

How create AutoPtr for const AbstractConfiguration*

UPD

if using

const Poco::AutoPtr<AbstractConfiguration> view = cfg.createView("live_time");

Error is 

/home/evgen/projects/AuthService/Core/Module/src/LiveTimeConfig.cpp:27: error: invalid conversion from ‘const Poco::Util::AbstractConfiguration*’ to ‘Poco::Util::AbstractConfiguration*’ [-fpermissive]
 const Poco::AutoPtr<AbstractConfiguration> view = cfg.createView("live_time");
                                                                             ^
Solution

  • Only using const_cast success build and work, but I think is it hack and smell code.

    const Poco::AutoPtr<AbstractConfiguration> view = const_cast<AbstractConfiguration*>(cfg.createView("live_time"));