CODEWITHSUNDEEP
c++templatesinheritance
Raffi
Raffi

Reputation: 107

Class derived from template does not see the constructor

I try to inherit from the class template "TControl" but the derived class "TControlML" does not see the constructor of the base class. I have read related articles but still do not see the cause. I have made a minimal example:

using namespace std;

class MeshLink
{
};


template<typename WU_TYPE>
class TControl
{
public:
    TControl(std::vector<WU_TYPE>& vWorkunits_):
        sTodo(vWorkunits_.begin(),vWorkunits_.end())
    {}
    std::set<WU_TYPE> sTodo;    
};



class TControlML:public TControl<MeshLink*>
{
public:

};


int main()
{
    vector<MeshLink*> vMeshLinks;
    TControl<MeshLink*> ctrl(vMeshLinks); // Good
    TControlML ctrl2(vMeshLinks); // Fails

}

GCC says:

test.cpp:35:29: error: no matching function for call to ‘TControlML::TControlML(std::vector<MeshLink*, std::allocator<MeshLink*> >&)’
  TControlML ctrl2(vMeshLinks); // Fails

Upvotes: 0

Views: 30

Answers (2)

lorro
lorro

Reputation: 10880

You need:

using TControl<MeshLink*)>::

TControl;

This is because ctors are not inherited automatically.

Upvotes: 0

Jarod42
Jarod42

Reputation: 217085

You have to use base constructor, you might use using for that

class TControlML:public TControl<MeshLink*>
{
public:
    using TControl::TControl;
};

Or the old way:

class TControlML:public TControl<MeshLink*>
{
public:
    TControlML(std::vector<WU_TYPE>& vWorkunits_):TControl(vWorkunits_) {}
    // Same for each constructor
};

Upvotes: 4

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