Thread overview
[Issue 13629] Field postblit can't be generated for const field
Oct 19, 2014
ag0aep6g@gmail.com
Oct 19, 2014
ag0aep6g@gmail.com
Oct 20, 2014
Jonathan M Davis
October 19, 2014
https://issues.dlang.org/show_bug.cgi?id=13629

ag0aep6g@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ag0aep6g@gmail.com

--- Comment #1 from ag0aep6g@gmail.com ---
Same with destructor:

struct A
{
    ~this() {} /* Error: mutable method test.B.~this is not callable using a
const object */
}
struct B {A a;}
struct C {const B b;}

--
October 19, 2014
https://issues.dlang.org/show_bug.cgi?id=13629

--- Comment #2 from ag0aep6g@gmail.com ---
A workaround:

struct C
{
     const B[1] b_;
     @property ref const(B) b() {return b_[0];}
}

--
October 20, 2014
https://issues.dlang.org/show_bug.cgi?id=13629

Jonathan M Davis <issues.dlang@jmdavisProg.com> changed:

           What    |Removed                     |Added
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                 CC|                            |issues.dlang@jmdavisProg.co
                   |                            |m

--- Comment #3 from Jonathan M Davis <issues.dlang@jmdavisProg.com> ---
As much as this sucks, it really isn't a bug. const and postblits are incompatible by their very nature, because the postblit copies and then mutates, which violates const. So, arguably, going with postblit constructors over copy constructors was a mistake. There's a DIP that tries to fix the problem ( http://wiki.dlang.org/DIP49 ), but it was deemed to be way too complicated. This is a design problem in the language that needs to be fixed (possibly by adding copy constructors) and not a bug in the compiler. It is expected behavior at this point.

--
June 10
https://issues.dlang.org/show_bug.cgi?id=13629

moonlightsentinel@disroot.org changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
                 CC|                            |moonlightsentinel@disroot.o
                   |                            |rg
         Resolution|---                         |WORKSFORME

--- Comment #4 from moonlightsentinel@disroot.org ---
The first example works since 2.067.1, the latter with 2.068.2 (according to
run.dlang.io)

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