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


--- Comment #0 from Vladimir Matveev <dpx.infinity@gmail.com> 2011-05-11 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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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


--- Comment #1 from kennytm@gmail.com 2011-05-11 10:40:22 PDT ---
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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