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Type: Posts; User: D_Drmmr

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  1. Re: Understanding the Composite Design Pattern

    If you have a tree-like structure in your data, there are several common ways to represent it in your code. Note that a tree is a special type of graph, but this goes for any type of graph.
    In my...
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    Re: Abstraction concept problem?

    Slicing is only a problem is B is designed as a polymorphic base class. If that's the case, you should take either a (const) reference or (smart-)pointer to an abstract base class. You cannot store...
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    Re: Abstraction concept problem?

    From the text I quoted.

    Didn't read that anywhere in your text.

    I agree that the focus on the use of pointers is misleading. It is not pointers that are evil, but they can be a sign of many...
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    Re: Abstraction concept problem?

    I find your suggestion that value semantics are outdated and reference semantics are modern out of touch with modern programming. Reference semantics are much harder to reason about than value...
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    Re: std::vector with negative subscript?

    You can use Boost.MultiArray, which allows setting an 'index base' to change the index of the first element in the array.
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    Re: shared_from_this problem?

    Either use std::shared_ptr, or boost::enable_shared_from_this.
  7. Re: Thread Performance Improvement (A little Advice Please)

    Which compiler (version) are you using? Is this C or C++?
    How do you create the threads?

    If you want to give thread A priority over the other threads, then you should give it a higher priority....
  8. Re: adding rational number using only class functions

    No more with a signed integer than with an unsigned. What's your point?

    Like I said, I tried this for a while and stopped, because I realized I was over-complicating my code.
    With an unsigned...
  9. Re: adding rational number using only class functions

    Obviously. My point is that "the value should never be negative" is not a reason to use an unsigned type. There may still be situations where you need to take a difference or use the value in an...
  10. Re: adding rational number using only class functions

    What would you gain from making the function static? It only requires more typing.
  11. Re: adding rational number using only class functions

    I would strongly advice against mixing signed and unsigned integers. Just take this simple example:


    int numerator = -1;
    unsigned int denominator = 2;
    bool isNegative = (numerator * denominator...
  12. Re: adding rational number using only class functions

    You start by writing all the tests (in this case unit tests) and then implement your class function by function to pass all the tests. This forces you to first think about all the functionality your...
  13. Re: adding rational number using only class functions

    Better to use a bool for the sign (and name it something like isPositive or isNegative), since there can only be two possible states ever.

    Your setnumerator and setdenominator functions violate...
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    Re: Converting JAVA for loop to C++ for loop

    Don't use new [] in C++, there is no need for it. Use std::vector instead.

    And please post the code here, rather than providing some external link.
    What do you mean by "doesn't work"?
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    Re: template class with template members

    That's not really a solution. How will this code be able to create/copy/destroy an instance of X?

    @Tiny Dolls
    Why do you want to get rid of the class template? What do you want to accomplish at a...
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    Re: Handing more than one exception at a time

    Not exactly. It's not throwing the exception during stack unwinding that is the problem. The problem is when the exception thrown during stack unwinding is not caught. If you catch any thrown...
  17. Re: Problem With Sleep() When drawing ananalog clock

    Don't know if threads are covered in the book, but a quick way to make the program update approximately each second is to run the loop in a thread.


    std::atomic<bool> stop(false);...
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    Re: GUI design in C++

    Well, no, because Windows Forms requires .Net and unmanaged C++ doesn't give you that.

    What do you miss?

    If you mean a nice looking GUI application, then yes that's possible in C++.
  19. Re: Problem With Sleep() When drawing analog clock

    Calling sleep pretty much puts your program (well, the thread that calls sleep) into a coma. It doesn't do anything until it wakes from its sleep. One important thing your program won't do while it...
  20. Re: MFC Proper usage of sending message to dialog to activate

    Why not just send the dialog a custom message to tell it to update the combo box contents? Or just add a member function to the dialog class that you call directly?
  21. Re: Data structure for text predictor using qwerty keyboard in c++

    You call a dictionary application a text predictor and then conclude from that example that a dictionary is a form of text predictor. Seems like circular reasoning to me.

    I would assume the...
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    Re: Hash table efficiency

    When you say 'hashtable size' do you mean 'number of buckets'?
    I think OP meant not knowing the maximum number of data elements to be stored ahead of time.

    What makes you say this is a bad idea?...
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    Re: Calling a function in AfxBeginThread

    ...and synchronize access to the string data member using a Critical Section.
  24. Re: Exit two-threaded program with user input?

    Mandatory reading: http://www.drdobbs.com/parallel/interrupt-politely/207100682
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    Re: IF-free conception.

    Are you benchmarking unoptimized code? That's not very useful.
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