Using | in function params??

This is a discussion on Using | in function params?? within the C++ Programming forums, part of the General Programming Boards category; I have a function that takes flags, it looks like this: Code: void Something1(en1 flags) { ... ... } //where ...

  1. #1
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    Using | in function params??

    I have a function that takes flags, it looks like this:
    Code:
    void Something1(en1 flags)
    {
        ...
        ...
    }
    
    //where en1 is an enum as:
    enum en1
    {
       FLAG1,
       FLAG2,
       FLAG3,
       FLAG4,
    }
    //I need to select more than one flag using the bitwise or operator | like that:
    Something1(en1(FLAG1 | FLAG3));
    How can I do that? I tried in the Something1 function an if clause with if (flags & FLAG1) for example, but it didnt work as expected. Any ideas?

    Thanks
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  2. #2
    Skunkmeister Stoned_Coder's Avatar
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    Something1(FLAG1 | FLAG2);

    should do the trick.
    Free the weed!! Class B to class C is not good enough!!
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  3. #3
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    Hello? I did that as you see.
    My problem lies in the Something1 definition. Here is what I have so far:
    Code:
    void Something1(en1 flags)
    {
       if (flags & FLAG1)
          { do something for flag1 }
       if (flags & FLAG2)
         { do something for flag2 }
       etc etc etc..
    }
    It wont work correctly.
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  4. #4
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    It worked with defined but for some reason it didnt with enum. In the enum, I dont shift, in the defines I do.
    Whats going on here?? :S
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  5. #5
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    Oh, it works now.

    Uhh, can you explain me why we used those exact values and any other value wont work?
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    Bringing the software of the future on the net.

  6. #6
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    Oh...

    Also.. Is there a way to combine that with hex numbers like 0x0400 for example? So i would have in an enum:

    Code:
    enum en1
    {
       flag1 = 0x0400,
       flag2 = 0x0500,
       flag3 = 1<<flag3
    }
    would that work?
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  7. #7
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    I see. Since I need to use this in a very few situations, I will stick with the shifting thing. Thanks a lot!
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