constructor???

This is a discussion on constructor??? within the C++ Programming forums, part of the General Programming Boards category; I found this code in a book. Code: class Binary_Search_Tree{ struct Node; Node * _root; //blah //blah }; struct Binary_Search_Tree::Node{ ...

  1. #1
    ... arjunajay's Avatar
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    Talking constructor???

    I found this code in a book.
    Code:
    class Binary_Search_Tree{
        struct Node;
        Node * _root;
        //blah
        //blah
    };
    
    struct Binary_Search_Tree::Node{
        Type _;
        Node* _left;
        Node* _right;
        Node(Type = Type(), Node* =0, Node* = 0);
    };
    1.)What does that line mean? Is it a constructor for 'struct's'?
    I've never heard of constructors for structs.
    2.)More over throughout the whole program, I dont see any
    Code:
    template<class Type>
    Is it correct?

  2. #2
    Toaster Zach L.'s Avatar
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    'Type' better be a typedef or class somewhere. The logical choice would've been to make it a template parameter as you suggested, but apparently, they didn't do that.

    Structs can have constructors, destructors, private member data, virtual functions, inherit from one another, etc.

    The only difference between classes and structs is their default access. That is:
    Code:
    struct foo1 {
       int bar; // This is public
    };
    
    class foo2 {
       int bar; // This is private
    };
    That is the only difference.
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

  3. #3
    Registered User
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    Minor clarification: these are the only differences:
    Code:
    struct foo1 : base { // base is inherited publicly
      int bar; // This is public
    };
     
    class foo2 : base { // base is inherited privately
      int bar; // This is private
    };

  4. #4
    Toaster Zach L.'s Avatar
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    Right... Thanks.

    I always explicitly state public/private inheritance, and never think about it.

    Cheers
    The word rap as it applies to music is the result of a peculiar phonological rule which has stripped the word of its initial voiceless velar stop.

  5. #5
    ... arjunajay's Avatar
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    cool... I never knew this...
    Structs can have constructors, destructors, private member data, virtual functions, inherit from one another, etc.

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