Object instance creation error

[Ami]

Hi All,
I am trying to create a class whose constructor takes Void
parameter and stores it for future reference. It works fine as
expected.

class base
{
public:
base(LPVOID pObj){ //store lpvoid for reference};
virtual ~base(){};
virtual void func1() { printf("Hello from base\n") };
};

When I create another class from above given class and try to create
object from it, it get following error.

error C2664: 'derived::derived' : cannot convert parameter 1 from
'const int' to 'const class derived &'
Reason: cannot convert from 'const int' to 'const class
derived'
No constructor could take the source type, or constructor
overload resolution was ambiguous


class derivedublic base
{
protected:
virtual void func1(){ printf("Hello from Derived\n") };
};

int main()
{
base *nderived= new derived(NULL); //error
}


Please can any one help me to make this working.
Thanks and Regards

 

[Obnoxious User]

Hi All,
I am trying to create a class whose constructor takes Void
parameter and stores it for future reference. It works fine as
expected.

class base
{
public:
base(LPVOID pObj){ //store lpvoid for reference};
virtual ~base(){};
virtual void func1() { printf("Hello from base\n") };
};

When I create another class from above given class and try to create
object from it, it get following error.

error C2664: 'derived::derived' : cannot convert parameter 1 from
'const int' to 'const class derived &'
Reason: cannot convert from 'const int' to 'const class
derived'
No constructor could take the source type, or constructor
overload resolution was ambiguous


class derivedublic base
{
protected:
virtual void func1(){ printf("Hello from Derived\n") };

public:
derived(LPVOID v) : base(v) {}

 

[Senthil]

Hi All,
I am trying to create a class whose constructor takes Void
parameter and stores it for future reference. It works fine as
expected.

class base
{
public:
base(LPVOID pObj){ //store lpvoid for reference};
virtual ~base(){};
virtual void func1() { printf("Hello from base\n") };

};

When I create another class from above given class and try to create
object from it, it get following error.

error C2664: 'derived::derived' : cannot convert parameter 1 from
'const int' to 'const class derived &'
Reason: cannot convert from 'const int' to 'const class
derived'
No constructor could take the source type, or constructor
overload resolution was ambiguous

class derivedublic base
{
protected:
virtual void func1(){ printf("Hello from Derived\n") };

};

int main()
{
base *nderived= new derived(NULL); //error

}

Please can any one help me to make this working.
Thanks and Regards

Since the base class constrcutor needs a argument, you derived class'
constructor should provide it.
class derived : public base
{
derived(void*):base(NULL){}
}

would make your code compile..

Best Regards,
Senthil

 

[Stefan Naewe]

Hi All,
I am trying to create a class whose constructor takes Void
parameter and stores it for future reference. It works fine as
expected.

class base
{
public:
base(LPVOID pObj){ //store lpvoid for reference};
virtual ~base(){};
virtual void func1() { printf("Hello from base\n") };
};

When I create another class from above given class and try to create
object from it, it get following error.

error C2664: 'derived::derived' : cannot convert parameter 1 from
'const int' to 'const class derived &'
Reason: cannot convert from 'const int' to 'const class
derived'
No constructor could take the source type, or constructor
overload resolution was ambiguous


class derivedublic base
{
protected:
virtual void func1(){ printf("Hello from Derived\n") };
};

int main()
{
base *nderived= new derived(NULL); //error
}


Please can any one help me to make this working.
Thanks and Regards

derived does not have a c'tor that's able to take 'NULL'.
You have to declare that c'tor in class derived.

Regards,
Stefan

 

[Ami]

public:
derived(LPVOID v) : base(v) {}

Hi Obnoxious,
Many thanks for reply. It works as expected. Thanks again.
Regards

 

[Ami]

Hi Obnoxious,
Many thanks for reply. It works as expected. Thanks again.
Regards

Many thanks all of you for suggestion.
Regards,