• d-bugmail puremagic.com (36/36) Sep 10 2012 http://d.puremagic.com/issues/show_bug.cgi?id=8638
• d-bugmail puremagic.com (27/27) Sep 12 2012 http://d.puremagic.com/issues/show_bug.cgi?id=8638
• d-bugmail puremagic.com (23/23) Sep 16 2012 http://d.puremagic.com/issues/show_bug.cgi?id=8638

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8638

           Summary: built-in array opSliceAssign fails with user defined
                    opAssign
           Product: D
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: monarchdodra gmail.com



In a word:

--------
struct S
{
    void opAssign(int j);
}

void main()
{
    int[] i;
    i[] = 5; //Here1

    S[] s;
    s[] = 5; //Here2
}
--------

Actual behavior:
Here2: Error: cannot implicitly convert expression (5) of type int to S[]

Expected behavior:
Here2: opAssign(5) is called for each member of s, just like for Here1.

Ditto for all other flavors of opSliceSomething.

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8638




The issue can be worked around as such:

--------
struct S
{
    int i;
    void opAssign(S);
    void opAssign(int j);
}

void main()
{
    ulong[] i;
    i[] = cast(ushort)5; //Here1

    S[] s;
    s[] = S(5); //Here2
}
--------

However, this shifts the requirement:
*from isAssignable!(S,V)
*to isAssignable!(S,S) && "canBeConstructedFrom!(S, V)"

Where S is the user defined struct, and V is another type.

Note that the built-in opSliceAssign DOES support assignement of V to S
(HERE1), so there is indeed a limitation/bug/ER.

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d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=8638


monarchdodra gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement



Just wanted to document that the issue also exists for opOpAssign:

--------
struct S
{
    void opOpAssign(int);
}

void main()
{
    S[] ss;
    ss[]+=1;
}
--------

Also, I'm not 100% sure if this is a bug or not, but I believe it *should*
work, so I'm re-labeling as ER

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