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pnayak
pnayak
Last Activity: May 9 '12, 06:44 PM
Joined: Apr 22 '08
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  • pnayak
    started a topic looser throw specifier in gcc 4.0.1
    in C

    looser throw specifier in gcc 4.0.1

    Hi All,

    Compiling the code below should result in the "looser throw specifier" error from the gcc compiler. It does give me that error if I un-comment the destructor in the derived class. But the default destructor created by the compiler should will be essentially the same. So I'm wondering why this compiles.
    Code:
    #include <iostream>

class Base {
    public:        Base()  { std::cout
    ...
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    • pnayak
      started a topic ofstream/ostream flush() error check
      in C

      ofstream/ostream flush() error check

      Is this method of checking, if flush() succeeded or failed, valid?

      Code:
      std::ofstream ofs;
file.open("test.txt")

file << "line of text";

if (!ofs.flush()) {
    std::cout << " failed to write \n ";
    return 1;
}
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      • pnayak
        replied to Instrusive List Container using the Base class as the node
        in C
        That's the same paper from which I was testing the conclusion. The entire paper is about comparing the the two types on performance and flexibility. But according to you they are not equivalent and comparing them makes no sense!

        You should also read The C++ Programming Language by Stroustrup [16.2]. That will give you a better understanding of the concepts involved.

        Here are a few of lines from the papers abstract....
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        • pnayak
          replied to Instrusive List Container using the Base class as the node
          in C
          I completely disagree.

          The choice of intrusive and non-intrusive lists with regards to performance and flexibility is very important in Container design and form a fairly large part of any literature that deals with the topic. Their comparison is very important and makes a lot of sense.
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          • pnayak
            replied to Iterator Implementation Compile error
            in C
            I tried on another box with a 4.2 version of gcc and same problem. However the Error message in this case is,

            nList.cc:50: error: type 'nList<T>' is not derived from type 'List_Iterator< T>'
            nList.cc:50: error: expected ';' before 'current_'
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            • pnayak
              started a topic Iterator Implementation Compile error
              in C

              Iterator Implementation Compile error

              Hi,

              I am trying to implement an iterator to a List class. The code is included below. I get the following compiler error. At the point where I use a class that is defined inside a template (nList<T>::Link ). The Link class is defined inside of a template. (I assume that is possible?). Any one know what I doing wrong?

              Many Thanks,
              Purush

              Error from Compiler (gcc 3.4.6)
              nList.cc:52: error:...
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              Last edited by pnayak; Apr 25 '08, 03:17 AM. Reason: more explanation
              • pnayak
                replied to Instrusive List Container using the Base class as the node
                in C
                That's a nice point, however, what I am trying to do here is to develop an intrusive list and not a non-intrusive list, which is what you are describing. One way of developing an intrusive list it to use the Link object as a member of the application class. The other option is to make the Link a common base class.

                I am trying to ascertain whether intrusive lists have better performance as opposed to non-intrusive lists since the ...
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                • pnayak
                  replied to Instrusive List Container using the Base class as the node
                  in C
                  OH MY HOLY GOD. You are right.

                  I wasted an entire evening on this. I pretty much tore apart the c++ template vocabulary to understand this "obscure" behavior. Turned out to be a semi colon !!!!.

                  Thank you so much.
                  Purush
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                  • pnayak
                    started a topic Instrusive List Container using the Base class as the node
                    in C

                    Instrusive List Container using the Base class as the node

                    Hi,

                    I am trying to write an intrusive List template class that accepts any type that is derived from a class called Link. I've derived a class called Student from Link to experiment. When I use the Link and Student class without List they work very well but when I used them through the List class the new operator doesn't throw but seems to be return 0.

                    I've pasted the full code here and the program output. The commented...
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                    Last edited by Ganon11; Apr 25 '08, 09:21 PM. Reason: Please use the [CODE] tags provided, rather than [INDENT] tags.
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