CODEWITHSUNDEEP
c++overloadingredeclaration
Luca Jungla
Luca Jungla

Reputation: 150

How to fix redeclaration error: class member cannot be redeclared in C++

Attempting to overload a member function of a class, a redeclaration error occurred.

In class declarations even Qt reveal a problem:

error: class member cannot be redeclared
note: previous declaration is here

This message is provided for the classes marked as "overload2" in the code below:

template <class GraphReaderType, class GraphType>
class GraphsDataset {

public:

    template <typename BoostGraphsContainer, typename LabelsContainer>
    bool readDataset(const std::string& datasetPath, BoostGraphsContainer& graphsContainer, LabelsContainer& labels) const;

    // "Overload 1"
    template <typename BoostGraphsContainer, typename LabelsContainer, typename IdsContainer>
    bool readDataset(const std::string& datasetPath, BoostGraphsContainer& graphsContainer, LabelsContainer& labels,
             IdsContainer& ids) const;
    //"Overload 2"
    template <typename BoostGraphsContainer, typename LabelsContainer, typename uniqueLabelContainer>
    bool readDataset(const std::string& datasetPath, BoostGraphsContainer& graphsContainer, LabelsContainer& labels, uniqueLabelContainer& labelsSet) const;
...
}

The compilation fails complaining about overloading.

GraphsDataset.hpp:120: error: ‘template<class GraphReaderType, class GraphType> template<class BoostGraphsContainer, class LabelsContainer, class uniqueLabelContainer> bool spare::GraphsDataset<GraphReaderType, GraphType>::readDataset(const string&, BoostGraphsContainer&, LabelsContainer&, uniqueLabelContainer&) const’ cannot be overloaded
     bool readDataset(const std::string& datasetPath, BoostGraphsContainer& graphsContainer, LabelsContainer& labels, uniqueLabelContainer& labelsSet) const;
          ^~~~~~~~~~~

The compilation works if one among "Overload 1/2" member function is deleted.

Why these functions can't be overloaded together?

Upvotes: 0

Views: 2219

Answers (0)

Related Questions