Constructing a Class Given a String

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  • Todd Bandrowsky
    #1

    Constructing a Class Given a String

    I was just about to make the proclamation that the standard C++'s rtti
    can't quite do all the stuff that .NET reflection can do, but I
    thought I would check. Perhaps my C++ knowledge is not quite up to
    date!

    Does the latest go around of C++ envision richer run time type
    information similar to that offered by Delphi or .NET?

    I know that rtti lets me get a typeinfo with the string name of the
    class in it, but I can't see a way to get a class given a string name?
    Am I still stuck in switch land and factory patterns for this?

    Similarly, I would like to go back and forth between enumerations and
    strings.

    Also, does anyone know if GNU offers "language extensions" to do this
    exact thing?

    Thanks!
    Tags: None
    • Victor Bazarov
      #2
      Re: Constructing a Class Given a String

      Todd Bandrowsky wrote:[color=blue]
      > I was just about to make the proclamation that the standard C++'s rtti
      > can't quite do all the stuff that .NET reflection can do, but I
      > thought I would check. Perhaps my C++ knowledge is not quite up to
      > date![/color]

      I can say the same about my knowledge of .NET reflection.
      [color=blue]
      > Does the latest go around of C++ envision richer run time type
      > information similar to that offered by Delphi or .NET?[/color]

      I've not heard of anythink like that, besides, I've not seen the need.
      [color=blue]
      > I know that rtti lets me get a typeinfo with the string name of the
      > class in it, but I can't see a way to get a class given a string name?[/color]

      RTTI-returned string is (a) implementation-specific and (b) not guaranteed
      to have any meaningful content. And, no, there is no mechanism in the
      language to identify types by name during run-time. Generally, one can
      say that there are no types during run-time.
      [color=blue]
      > Am I still stuck in switch land and factory patterns for this?[/color]

      Yes, you probably are. If you really need that thing, that is.
      [color=blue]
      > Similarly, I would like to go back and forth between enumerations and
      > strings.[/color]

      Similarly, there is no language mechanism to do that. You need to provide
      one if you need it.
      [color=blue]
      > Also, does anyone know if GNU offers "language extensions" to do this
      > exact thing?[/color]

      Ask in a GNU newsgroup.

      Victor

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