[Issue 7543] New: inout opApply should work properly

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=7543

           Summary: inout opApply should work properly
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: k.hara.pg at gmail.com
        Depends on: 7542


--- Comment #0 from Kenji Hara <k.hara.pg at gmail.com> 2012-02-19 03:50:14 PST ---
After fixing issue 7542, inout opApply should work on foreach.

class C
{
    int[] arr;
    this(int[] a){ arr = a; }

    int opApply(int delegate(ref inout(int)) dg) inout
    {
        foreach (ref e; arr)
            if (auto r = dg(e)) return r;
        return 0;
    }
}
void main()
{
    size_t i;

    i = 0;
    foreach (e; new C([1,2,3]))
    {
        static assert(is(typeof(e) == int));
        assert(e == ++i);
        e = 10;
    }
    assert(i == 3);

    i = 0;
    foreach (e; new const(C)([1,2,3]))
    {
        static assert(is(typeof(e) == const int));
        assert(e == ++i);
        static assert(!__traits(compiles, e = 10));
    }
    assert(i == 3);

    i = 0;
    foreach (e; new immutable(C)([1,2,3]))
    {
        static assert(is(typeof(e) == immutable int));
        assert(e == ++i);
        static assert(!__traits(compiles, e = 10));
    }
    assert(i == 3);
}

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