Quick Q - Typedefing integers

This is a discussion on Quick Q - Typedefing integers within the C++ Programming forums, part of the General Programming Boards category; Hey everyone. I have this line... Code: typedef int ProcessHandleType; and I pass it to my SystemType's member functions when ...

  1. #1
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    Quick Q - Typedefing integers

    Hey everyone.

    I have this line...
    Code:
    typedef int ProcessHandleType;
    and I pass it to my SystemType's member functions when i want to do something to one of its processes. The reason I want to use ProcessHandles is that a handle must be one larger than an index. So if the process's index is 1, then the handle is 2. If the index is 0, the handle is 1. The reason for this is that I want to be able to, in my code, check if the handle is valid by saying...
    Code:
    ProcessHandleType Handle = System.Add( MainInitialize() );
    if( !Handle )
    {
       cout << "Couldn't add main process." << endl;
       return 1;
    }
    But the problem is that in the SystemType's functions, it accepts ProcessHandleTypes but it will also accept plain integers!

    Long question short, how do I make it so I can typedef an integer as a ProcessHandleType, but not be able to pass integers when a function accepts a ProcessHandleType?

    Thanks!

  2. #2
    and the hat of wrongness Salem's Avatar
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    That seems a poor reason for fudging data types.

    Code:
    ProcessHandleType Handle = System.Add( MainInitialize() );
    if( ! isValidHandle(Handle) )
    {
       cout << "Couldn't add main process." << endl;
       return 1;
    }
    Then most of the code doesn't care about how you choose to implement Handles
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  3. #3
    Toaster Zach L.'s Avatar
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    Long question short, how do I make it so I can typedef an integer as a ProcessHandleType, but not be able to pass integers when a function accepts a ProcessHandleType?
    There seems to be some confusion here about what typedef does. ProcessHandleType (the way you've defined it) is an integer, you've just come up with a new name for it. The compiler will see absolutely no difference between (for example):
    Code:
    ProcessHandleType handle1 = 3; // and
    int handle2 = 3;
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