Help needed in C++/CLI with error C2512: no appropriate default constructor available

Having this issue with C++/CLI that's troubling me for a real long time and almost everything I've tried has failed. The problem is when I'm trying to create an instance of the GenDen reference managed type. I keep encountering error C2512: 'Instruction::GenDen' : no appropriate default constructor available. I'm posting the pieces of code here:


Code:

Code:

---

// GenDen.h
#pragma once

#include "prm.h"

namespace Triad{

public ref class GenDen : public Prm
{
        public:
                GenDen();
                GenDen(Slots slot);
};
}

---

Code:

---

// GenDen.cpp
#include "stdafx.h"
#include " GenDen.h"

using namespace Triad;

GenDen::GenDen (): Prm(){} //default constructor

GenDen::GenDen(Slots slot) : Prm()
{
        try{
                Initialize(slot);
        }
        catch(DenException^ e){
                throw e;
        }
}

void GenDen::Initialize(Slots slot){
        //Whole bunch of Code related to this Initialize function
}

---

Main Project File:

Code:

---

// Instruction.cpp

#include "stdafx.h"
#include "Form1.h"
#include "GenDen.h"
#include "prm.h"

using namespace Instruction;

void Form1::OpenInstruction(void)
{
        try {
               
                Den = gcnew GenDen (Triad::Slots::Slot8); //results in error C2512: 'Instruction::GenDen' : no appropriate default constructor available

                // Den = gcnew GenDen ();        //declaring it like this also results in the same error C2512       
               
        }
        catch (Pier::PierException^ ge) {
                throw ge;
        }

}

---

Code:

---

//Form1.h
#pragma once

#include "prm.h"
namespace Instruction {

        ref class GenDen;

        public ref class Form1 : public System::Windows::Forms::Form
        {
        public:
                Form1(void)
                {
                        InitializeComponent();
                }

        protected:
                ~Form1()
                {
                        if (components)
                        {
                                delete components;
                        }
                }
        private:
                void Open Instruction ();
        private:
                GenDen^ Den; //declaring a handle of GenDen managed type
              };
}

---

Code:

---

//Prm.h
#pragma once

namespace Triad
{
        using namespace System;
        using namespace System::Windows::Forms;

        public enum class Slots{
                Slot1,
                Slot2,
                Slot3,
                Slot4,
                Slot5,
                Slot6,
                Slot7,
                Slot8,
                Slot9,
                Slot10,
                Slot11,
                Slot12,
                Slot13,
                Slot14,
                Slot15,
                Slot16,
                Slot17,
                Slot18,
                Slot19,
                Slot20
        };

        public ref class Prm{
        public:
                Prm(){ errorCode = 0; handle = 0; }
               
                virtual void Initialize(Slots slot){}
                virtual void Reset(){}
        };
}

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Can anyone help me on where I'm going wrong? All this is being done in VS 2010 C++ .NET 4.0. I'm new to C++/CLI, and figuring out all the intricacies has been interesting (even though they took a while). But this particular issue is proving beyond me.

Thanks

hmm...

First, where are you defining Den? Is it being defined as GenDen^ Den?

Next, if you want to initialize with the default constructor, all you need to do is GenDen^ Den = gcnew GenDen; (no parenthesis).

Finally, the error is resulting from you trying to bring a type name into a constructor expecting a type instance. Define a Slots variable and assign it the value Slot8 and then pass that variable to the Den declaration.

Code:

---

               
Den = gcnew GenDen (Triad::Slots::Slot8); //results in error C2512: 'Instruction::GenDen' : no appropriate default constructor available

---

I suggest using the correct namespace; note, this is a wild guess from an C programmer learning C++.

Code:

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Den = gcnew Triad::GenDen (Triad::Slots::Slot8);

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