• d-bugmail puremagic.com (38/38) Jul 05 2011 http://d.puremagic.com/issues/show_bug.cgi?id=6254

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=6254

           Summary: Problem with associative array with array of array as
                    keys
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: druntime
        AssignedTo: nobody puremagic.com
        ReportedBy: bearophile_hugs eml.cc



This program:


static immutable(char[][]) toConstMatrix(char[][] M) {
    immutable(char[])[] result;
    foreach (row; M)
        result ~= row.idup;
    return result;
}
void main() {
    char[][] M = [" ".dup, " ".dup, " ".dup, " ".dup, " ".dup];
    auto a = toConstMatrix(M);
    auto b = toConstMatrix(M);
    bool[char[][]] foo;
    foo[a] = true;
    assert(a == b, "a != b");
    assert(a in foo, "a not in foo");
    assert(b in foo, "b not in foo");
}


DMD 2.053 gives:

core.exception.AssertError test.d(15): b not in foo

But I think the hash of a dynamic array of a dynamic array has to be computed
on just the contents (and lengths) of the arrays.

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