尝试使用AutoPtr工作const指针:

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");
    }
}


但是我在比较运算符上有错误。

../../../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


如何为const AbstractConfiguration *创建AutoPtr *

UPD

如果使用

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


错误是

/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");
                                                                             ^

最佳答案

我不知道这个库,也不知道它的内部,但似乎它在内部对const类型进行操作时遇到了问题。不过,这应该不成问题,因为get函数有两个重载,而const对象实例的一个重载返回了const指针。 (const C * get() const;)所以您可以使用:

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


作为指向const AbstractConfiguration的指针。

编辑:

也可以从此标头中读取此编译器错误的原因。
因此,AutoPtr类为每个运算符==等声明了一对函数。

bool operator == (
    const C * ptr
) const;




bool operator == (
    C * ptr
) const;


但是当您声明Poco::AutoPtr<const AbstractConfiguration>时,两个重载都具有相同的声明

bool operator == (
    const AbstractConfiguration * ptr
) const;


这会引发编译错误。

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关于c++ - Poco::AutoPtr上的const指针,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/47015430/

10-11 23:11
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