Cobra Forums

Posted: **Sun Dec 07, 2008 10:49 pm**

I'm getting error trying to use bitwise operator on combined enum values:

enum Borders
    Top = 1
    Right = 2
    Bottom = 4
    Left = 8

class Test
    def main is shared
        borders = Borders(Top,Left)
        assert (borders & Borders.Top) == Borders.Top

Code: Select all: test.cobra(10): error: Cannot apply AMPERSAND to Borders. Try finding a method that performs this function. Compilation failed - 1 error, 0 warnings

is there any support for bitwise operators on enum without casting every operand to int?

Posted: **Sun Dec 07, 2008 11:51 pm**

Hmm, it looks like when I implemented the bitwise operators, I did them for ints, but not enums. Sorry about that. For now you will have to use casts.

Posted: **Mon Dec 08, 2008 12:29 am**

Fixed, tested and checked in.

Posted: **Mon Dec 08, 2008 12:34 am**

Thanks!

the fix is a pretty small delta

Posted: **Mon Dec 08, 2008 12:39 am**

Well I probably inadvertently allowed "enum + enum" and "enum * enum" but this quick fix is the lesser of two evils.

Posted: **Mon Dec 08, 2008 12:45 am**

Can you point me to a sample of compiler unit test that check for expected message? (a beginner one)

Posted: **Mon Dec 08, 2008 1:43 am**

<workspace>\Tests\100-basics\402-branch.cobra

which tests a parsing error. Not that the type of error really matters.

Posted: **Mon Dec 08, 2008 1:57 am**

Is there a way to run the testfixtures asserting on theses compilator errors?

Posted: **Mon Dec 08, 2008 2:06 am**

I'm not entirely sure what you're asking.

You can verify that Cobra generates an error with the # .error. directive in the test cases. If the compiler fails to generate an error, then that test will fail. If the error takes place with the given substring included, then the test passes.

See also:

-- <workspace>\Developer\ImplementationNotes.text. Look for "testify".

-- See also "Test Cases" at HowToSubmitAPatch.

-- The implementation is in TestifyRunner.cobra. Although hopefully you don't have to read that just to make new test cases.

If that does not answer your question, let me know.

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bitwise operator with enum?

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