[英]C++ Pure virtual function not detected in subclass
我具有以下類結構:
class MyBase
{
public:
virtual ExportData exportData() = 0;
virtual bool exportData(QString filepath)
{
ExportData data = exportData();
data.save(filepath);
}
};
class MyClass : public MyBase
{
public:
virtual ExportData exportData(){//some implementation}
};
class MySubClass : public MyClass
{
public:
virtual ExportData exportData(){//some implementation}
};
然后,我按如下所示導出數據:
MySubClass *sub = new MySubClass();
sub->exportData("/home/me/export.xml");
嘗試使用g ++進行編譯時,出現以下錯誤:
error: no matching function for call to ‘MySubClass::exportData(QString)’
note: candidate is: virtual ExportData MySubClass::exportData()
note: candidate expects 0 arguments, 1 provided
我看不到我做錯了什么,為什么會這樣?
通過在MySubClass
聲明virtual ExportData exportData()
,可以隱藏virtual bool exportData(QString filepath)
。 您需要using
聲明將其納入范圍:
class MySubClass : public MyClass
{
public:
using MyBase::exportData;
virtual ExportData exportData(){//some implementation}
};
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