• d-bugmail puremagic.com (32/32) May 11 2011 http://d.puremagic.com/issues/show_bug.cgi?id=5979
• d-bugmail puremagic.com (16/16) May 11 2011 http://d.puremagic.com/issues/show_bug.cgi?id=5979

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=5979

           Summary: bigint rvalue equality
           Product: D
           Version: D2
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: dpx.infinity gmail.com



09:46:20 PDT ---
Code

import std.bigint;

BigInt foo() {
    return BigInt(128);
}

void main() {
    BigInt bar = BigInt(128);
    assert(foo() == bar);
    assert(bar == foo());  // *** HERE
}

does not compile with the following error on the marked line:
test.d(10): Error: foo() is not an lvalue

It seems that is because of the ref parameter of the opEquals method in the
BigInt structure. Obviously it is not needed for the parameter to be a
reference in this case, though it could be thought as a possible performance
tweak (I don't know for certain about the correctnes of this though).

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=5979


kennytm gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |kennytm gmail.com
         Resolution|                            |DUPLICATE



Unfortunately an opEquals for a struct must take the signature of (ref const S
s). See http://d-programming-language.org/operatoroverloading.html#equals. The
rvalue problem here is a specialization of bug 5609. Allowing struct to have
any signature is a duplicate of issue 3659.

*** This issue has been marked as a duplicate of issue 5609 ***

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