• d-bugmail puremagic.com (47/47) Sep 25 2010 http://d.puremagic.com/issues/show_bug.cgi?id=4939

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=4939

           Summary: Some compile-time length tests of array concats
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: accepts-invalid, diagnostic
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: bearophile_hugs eml.cc



This is a wrong D2 program, because the lengths of the arrays don't match:



void main() {
    int[2] a1;
    int[3] a2;
    int[6] result;
    result[] = a1 ~ a2;
}


It compiles with no errors, because a1~a2 produces a dynamic array, despite its
length is determined at compile-time. I'd like the compile to catch this bug at
compile-time.


implementation of the same kind of tests may catch at compile-time more common
cases, like:



void main() {
    int[] a1 = new int[2];
    int[] a2 = new int[3];
    int[6] result;
    result[] = a1 ~ a2; // Error
    a1 ~= 0;
    result[] = a1 ~ a2;
}



void main() {
    int[] a1 = new int[2];
    int[] a2 = new int[3];
    int[] result = new int[6];
    result[] = a1 ~ a2; // Error
}

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------