• via Digitalmars-d-bugs (51/51) Oct 15 2015 https://issues.dlang.org/show_bug.cgi?id=15205

via Digitalmars-d-bugs <digitalmars-d-bugs puremagic.com> writes:

https://issues.dlang.org/show_bug.cgi?id=15205

          Issue ID: 15205
           Summary: Incorrect struct init via union array
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody puremagic.com
          Reporter: h1054820 trbvm.com

Tested with: D2.068.1 and D2.069.b

struct Foo
{
    this( float x_, float y_ )
    {
        // option A
        //x = x_;
        //y = y_;

        // option B
        v[0] = x_;
        v[1] = y_;
    }

    union
    {
        struct
        {
            float x = 0;
            float y = 0;
        }
        float[2] v;
    }
}

struct Bar
{
    Foo foo = Foo( 1, 2 );
}

Bar bar;
Bar baz = bar.init;

printf( "bar: %f, %f\n", bar.foo.x, bar.foo.y );
printf( "baz: %f, %f\n", baz.foo.x, baz.foo.y );
-------------------------------------------------
prints (with option B):
bar: 0.000000, 0.000000   // BUG??
baz: 1.000000, 2.000000

prints (with option A):
bar: 1.000000, 2.000000
baz: 1.000000, 2.000000

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