Indirectly inherited class push_back's to std::vector
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Thread: Indirectly inherited class push_back's to std::vector

  1. #1
    Join Date
    Dec 2010
    Posts
    587

    Indirectly inherited class push_back's to std::vector

    Here is the pseudocode:
    Code:
    class Object
    {
    };
    
    class Goods : public Object
    {
    };
    
    class Pallet : public Goods
    {
        Pallet(const Pallet& _p) { this->mesh = _p.mesh; }
    };
    
    
    class myDX9Widget {
    std::vector<Object*> m_vRenderObjects;
    };
    
    SkinnedMesh *palletMesh = new SkinnedMesh();
    Pallet *pallet = new Pallet(palletMesh);
    
    m_vRenderObjects.push_back(pallet);      // Error here
    And BTW, if I need to use the copy constructor
    Code:
     
    class Lorry : public Object
    {
         myDX9Widget *mOwner;
         Pallet *GeneratePallet() 
         {
            Pallet *pallet = new Pallet();   // should have used a copy constructor here, 
    //but i don't have a reference of Pallet,
    // anywhere I should store it if you were programming a warehouse simulator....
            return pallet;
         }
    }
    This is triggered when a TruckArrive Event happens...

    Code:
    class TruckArrive
    {
        void OnUpdate(float dt)
        {
           if (m_blorryHasParked)
           {
              Lorry *lorry = dynamic_cast<Lorry*>(Actor);
              Pallet *pallet = lorry->GeneratePallet();
              lorry->mOwner->m_vRenderObjects.push_back(pallet);
           }
        }
    
    }
    Any comments are welcome!
    Jack
    Last edited by lucky6969b; June 18th, 2013 at 06:33 AM.

  2. #2
    Join Date
    Aug 2000
    Location
    West Virginia
    Posts
    7,564

    Re: Indirectly inherited class push_back's to std::vector

    1. Is it possible to create a small program that demonstrates the error ?
    For example, the following compiles:

    Code:
    #include <vector>
    
    class Object {};
    
    class Goods : public Object {};
    
    class Pallet : public Goods {};
    
    class myDX9Widget 
    {
       std::vector<Object*> m_vRenderObjects;
    
       void foo()
       {
          Pallet *pallet = new Pallet();
    
          m_vRenderObjects.push_back(pallet);  
       }
    };
    Last edited by Philip Nicoletti; June 18th, 2013 at 06:48 AM.

  3. #3
    Join Date
    Dec 2012
    Location
    England
    Posts
    2,266

    Re: Indirectly inherited class push_back's to std::vector

    Code:
    SkinnedMesh *palletMesh = new SkinnedMesh();
    Pallet *pallet = new Pallet(palletMesh);
    
    m_vRenderObjects.push_back(pallet);      // Error here
    To what function do these statements belong? - as posted they don't belong to any function which could be why you are getting an error.

    Here is the pseudocode:
    It would be much better if you posted the actual code rather than pseudocode so that we don't have to guess what your code is actually trying to do!
    All advice is offered in good faith only. You are ultimately responsible for effects of your programs and the integrity of the machines they run on.

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