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virtual??

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c++question
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  • J Joel Holdsworth

    Does anyone know why the virtual keyword in C++ has this name? It doesn't seem like a very sensible title for it. There must be some history to it or somthing? Joel Holdsworth

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    megaadam
    wrote on last edited by
    #5

    If you have got a deep interest in the history of C++ the book you should get is "The Design And Evolution of C++" by Stroustrup (father of C++). http://www.amazon.com/exec/obidos/search-handle-url/index%3Dblended%26field-keywords%3Ddesign%252520and%252520evolution%252520c%25252B%25252B%26store-name%3Dall-product-search/102-0180251-2256166 As for virtual allow me to speculate. The Ada programming language that appeared AFAIK before C++ has got a keyword "generic", which might be slightly related to "virtual". :) Adam _____________________________________ Action without thought is not action Action without emotion is not life

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    • M megaadam

      If you have got a deep interest in the history of C++ the book you should get is "The Design And Evolution of C++" by Stroustrup (father of C++). http://www.amazon.com/exec/obidos/search-handle-url/index%3Dblended%26field-keywords%3Ddesign%252520and%252520evolution%252520c%25252B%25252B%26store-name%3Dall-product-search/102-0180251-2256166 As for virtual allow me to speculate. The Ada programming language that appeared AFAIK before C++ has got a keyword "generic", which might be slightly related to "virtual". :) Adam _____________________________________ Action without thought is not action Action without emotion is not life

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      ColinDavies
      wrote on last edited by
      #6

      Very insightful. :-) :-) Regardz Colin J Davies Attention: Watch this signature for an upcoming announcement that will affect you.

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      • D Daniel Turini

        After you understand virtual, please explain me static :-D Yes, even I am blogging now!

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        leppie
        wrote on last edited by
        #7

        C/C++ C# ==================================== static private virtual abstract Anyways, thats how I understand it. :) top secret xacc-ide 0.0.1

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        • J Joel Holdsworth

          Does anyone know why the virtual keyword in C++ has this name? It doesn't seem like a very sensible title for it. There must be some history to it or somthing? Joel Holdsworth

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          J Offline
          Jorgen Sigvardsson
          wrote on last edited by
          #8

          I think you should ignore the fact that a virtual method may have a default implementation where it's declared. The function is there (declared) but not there at the same time (not implemented). It's virtually there. :) -- ...Coca Cola, sometimes war...

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          • J Jorgen Sigvardsson

            I think you should ignore the fact that a virtual method may have a default implementation where it's declared. The function is there (declared) but not there at the same time (not implemented). It's virtually there. :) -- ...Coca Cola, sometimes war...

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            Joel Holdsworth
            wrote on last edited by
            #9

            Yeah that kinda makes sense... but it still seems a little flimsy. Why not overridable or somthing else... somthing more intuitive. Joel Holdsworth

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            • J Joel Holdsworth

              Does anyone know why the virtual keyword in C++ has this name? It doesn't seem like a very sensible title for it. There must be some history to it or somthing? Joel Holdsworth

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              Bob Stanneveld
              wrote on last edited by
              #10

              From "The C++ programming language" by B. Stroustrup: The word virtual means: "may be redifined later in a class derived from this one."

              A student knows little about a lot. A professor knows a lot about little. I know everything about nothing.

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              • J Joel Holdsworth

                Yeah that kinda makes sense... but it still seems a little flimsy. Why not overridable or somthing else... somthing more intuitive. Joel Holdsworth

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                Roger Alsing 0
                wrote on last edited by
                #11

                a friend of a friend *cough* said that that was a vb.net keyword you dont want to include vb keywords into c++ do you? //Roger

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                • M megaadam

                  If you have got a deep interest in the history of C++ the book you should get is "The Design And Evolution of C++" by Stroustrup (father of C++). http://www.amazon.com/exec/obidos/search-handle-url/index%3Dblended%26field-keywords%3Ddesign%252520and%252520evolution%252520c%25252B%25252B%26store-name%3Dall-product-search/102-0180251-2256166 As for virtual allow me to speculate. The Ada programming language that appeared AFAIK before C++ has got a keyword "generic", which might be slightly related to "virtual". :) Adam _____________________________________ Action without thought is not action Action without emotion is not life

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                  Anthony_Yio
                  wrote on last edited by
                  #12

                  "generic" makes more sense to me though, than "virtual" Sonork 100.41263:Anthony_Yio

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                  • L leppie

                    C/C++ C# ==================================== static private virtual abstract Anyways, thats how I understand it. :) top secret xacc-ide 0.0.1

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                    Jon Hulatt
                    wrote on last edited by
                    #13

                    que? are you saying that static is the same as private, and virtual is the same as abstract?

                    #include <beer.h>

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                    • D Daniel Turini

                      After you understand virtual, please explain me static :-D Yes, even I am blogging now!

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                      David Crow
                      wrote on last edited by
                      #14

                      Daniel Turini wrote: please explain me static It simply means "lack of change." Another definition says it "lacks action or movement."


                      "When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

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                      • B Bob Stanneveld

                        From "The C++ programming language" by B. Stroustrup: The word virtual means: "may be redifined later in a class derived from this one."

                        A student knows little about a lot. A professor knows a lot about little. I know everything about nothing.

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                        Kastellanos Nikos
                        wrote on last edited by
                        #15

                        Bob Stanneveld wrote: From "The C++ programming language" by B. Stroustrup: The word virtual means: "may be redifined later in a class derived from this one." My "English/C++ lexicon" said the same thing. :cool: - - - - - - - - - - - - - - - - - - Memory leaks is the price we pay \0 01234567890123456789012345678901234

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                        • J Joel Holdsworth

                          Does anyone know why the virtual keyword in C++ has this name? It doesn't seem like a very sensible title for it. There must be some history to it or somthing? Joel Holdsworth

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                          papaya_zm
                          wrote on last edited by
                          #16

                          virtual is virtual,no reason,no history!

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                          • J Joel Holdsworth

                            Yeah that kinda makes sense... but it still seems a little flimsy. Why not overridable or somthing else... somthing more intuitive. Joel Holdsworth

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                            P Offline
                            palbano
                            wrote on last edited by
                            #17

                            Joel Holdsworth wrote: Why not overridable sorry, overridable is not the same. Joel Holdsworth wrote: somthing more intuitive.

                            public:
                               intuitive void execute()=0;
                            

                            :-D

                            -- signature under construction --

                            -pete

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