Do constructors get inherited?

This is a discussion on Do constructors get inherited? within the C++ Programming forums, part of the General Programming Boards category; I mean do they? It doesn't seem that they do, that's just silly Code: class Human : public Parent { ...

  1. #1
    Shadow12345
    Guest

    Do constructors get inherited?

    I mean do they? It doesn't seem that they do, that's just silly

    Code:
    class Human : public Parent {
    public:
    	Human(string name);
    
    
    private:
    
    
    };
    
    Human::Human(string name) {
    	Name = name;
    }
    Human is a derived class of Parent. parent is technically a human as well.

    I get this error:
    [error]
    Compiling...
    human.cpp
    C:\human.cpp(162) : error C2512: 'Parent' : no appropriate default constructor available
    Error executing cl.exe.

    human.exe - 1 error(s), 0 warning(s)
    [/error]

    that is really silly, I mean more silly than silly can possibly be!
    Last edited by Shadow12345; 08-21-2002 at 09:47 AM.

  2. #2
    pronounced 'fib' FillYourBrain's Avatar
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    yes they do. the base class constructor is called first, then the derived class.
    "You are stupid! You are stupid! Oh, and don't forget, you are STUPID!" - Dexter

  3. #3
    BMJ
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    So before you construct Human, you must construct Parent...
    (shouldn't Parent be derived from Human? )

  4. #4
    Banned Troll_King's Avatar
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    Originally posted by BMJ
    So before you construct Human, you must construct Parent...
    (shouldn't Parent be derived from Human? )
    No, he got it right. lol

  5. #5
    Shadow12345
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    parent in this case should absolutely not be derived from human, because each human must be created from two parents

  6. #6
    Banned Troll_King's Avatar
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    Make the partent constructor virtual if I remember correctly.

  7. #7
    Shadow12345
    Guest
    This is my parent constructor so far (emphasize SO FAR)
    Code:
    Parent::Parent(string name) {
    
    	Name = name;
    	
    	SkinColor = rand()%5;
    
    	HairColor = rand()%5;
    
    	EyeColor = rand()%5;
    
    	Height = (rand()%36) + 36; //mexico sucks
    
    	Weight = (rand()%200) + 70;
    
    	Intelligence = rand()%5;
    
    
    	
    };
    Here is my human constructor so far
    Code:
    class Human : public Parent {
    public:
    	Human(string name);
    
    
    private:
    
    
    };
    Can you see in those two constructors why I might be getting that error? I'll post the error again
    Compiling...
    human.cpp
    C:\human.cpp(162) : error C2512: 'Parent' : no appropriate default constructor available
    Error executing cl.exe.

    human.exe - 1 error(s), 0 warning(s)

    The error points to the Human::Human constructor
    should I change it to Parent::Human or something...frig

  8. #8
    Shadow12345
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    You can't make constructors virtual!!!!!!!!!!!!!!

  9. #9
    BMJ
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    yep

  10. #10
    Unregistered
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    You Should pass arguements to the Parent Constructor from the Human Class Constructor. So, You should define the Human Constructor like this.

    Human::Human(string ParentString, string HumanString)
    {
    Parent(ParentSring);
    name = HumanString;
    }

  11. #11
    Shadow12345
    Guest
    Ok well I don't even need to define a Human Constructor, because the Parent constructor does all that I need. However, when I don't do that I get the following errors:
    [error]
    --------------------Configuration: human - Win32 Debug--------------------
    Compiling...
    human.cpp
    C:\human.cpp(170) : error C2664: 'Human::Human' : cannot convert parameter 1 from 'char [8]' to 'const class Human &'
    Reason: cannot convert from 'char [8]' to 'const class Human'
    No constructor could take the source type, or constructor overload resolution was ambiguous
    C:\human.cpp(172) : error C2664: 'Human::Human' : cannot convert parameter 1 from 'char [8]' to 'const class Human &'
    Reason: cannot convert from 'char [8]' to 'const class Human'
    No constructor could take the source type, or constructor overload resolution was ambiguous
    C:\human.cpp(174) : error C2664: 'Human::Human' : cannot convert parameter 1 from 'char [4]' to 'const class Human &'
    Reason: cannot convert from 'char [4]' to 'const class Human'
    No constructor could take the source type, or constructor overload resolution was ambiguous
    C:\human.cpp(176) : error C2664: 'Human::Human' : cannot convert parameter 1 from 'char [6]' to 'const class Human &'
    Reason: cannot convert from 'char [6]' to 'const class Human'
    No constructor could take the source type, or constructor overload resolution was ambiguous
    C:\human.cpp(178) : error C2664: 'Human::Human' : cannot convert parameter 1 from 'char [5]' to 'const class Human &'
    Reason: cannot convert from 'char [5]' to 'const class Human'
    No constructor could take the source type, or constructor overload resolution was ambiguous
    C:\human.cpp(180) : error C2664: 'Human::Human' : cannot convert parameter 1 from 'char [7]' to 'const class Human &'
    Reason: cannot convert from 'char [7]' to 'const class Human'
    No constructor could take the source type, or constructor overload resolution was ambiguous
    Error executing cl.exe.

    human.exe - 6 error(s), 0 warning(s)
    [/error]

    Those errors are called everytime I make an instance of a human and try to assign it a name
    i.e

    Human Rachel("Rachel");

  12. #12
    Nick
    Guest
    If your base class has a non default constructor then
    the devived class has to call it like this

    Code:
    class A  {
    public:
           A(int n);
    };
    
    class B : public A {
    public:
            B() : A(4) { }
    };

  13. #13
    pronounced 'fib' FillYourBrain's Avatar
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    Originally posted by Troll_King
    Make the partent constructor virtual if I remember correctly.
    nope. you're thinking destructors
    "You are stupid! You are stupid! Oh, and don't forget, you are STUPID!" - Dexter

  14. #14
    Unregistered
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    So, You don't want to do anything with the Base Class Constructor(Parent) , then include default constructor in the Base class.

    class Parent

    public:

  15. #15
    Unregistered
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    So, You don't want to do anything with the Base Class Constructor(Parent) , then include default constructor in the Base class.

    class Parent
    {

    public:
    Parent()
    {
    }
    Parent(string Name)
    {
    name = Name;
    }
    }

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