Re: Very strange compilation error
On Wednesday, 15 October 2014 at 21:28:05 UTC, Nils Boßung wrote:
On Wednesday 15 October 2014 22:13, John Colvin wrote:
On Wednesday, 15 October 2014 at 19:29:27 UTC, Jack Applegame
wrote:
I don't understand why this code doesn't compile:
http://dpaste.dzfl.pl/dfd8df7f80ad
that should be immutable(ubyte)[] not immutable ubyte[] which
is
equivalent to immutable(ubyte[]). You can't overwrite immutable
data, hence the error.
Then
Foo1 foo1; foo1 = Foo1(); // compiles
shouldn't compile either.
Good point. That's an accepts-invalid IMO.
Nonetheless:
union { string a; immutable ubyte[] b; }
is broken, it is effectively casting away immutability.
union { string a; immutable(ubyte)[] b; } is the correct approach.
Very strange compilation error
I don't understand why this code doesn't compile: http://dpaste.dzfl.pl/dfd8df7f80ad
Re: Very strange compilation error
On Wednesday, 15 October 2014 at 19:29:27 UTC, Jack Applegame wrote: I don't understand why this code doesn't compile: http://dpaste.dzfl.pl/dfd8df7f80ad that should be immutable(ubyte)[] not immutable ubyte[] which is equivalent to immutable(ubyte[]). You can't overwrite immutable data, hence the error.
Re: Very strange compilation error
On Wednesday 15 October 2014 21:29, Jack Applegame wrote:
I don't understand why this code doesn't compile:
http://dpaste.dzfl.pl/dfd8df7f80ad
Immutability issues with unions ring a bell for me. This may be related to
issue 12885 [1] which is the result of dmd pull #2665 [2] which even
mentions std.date.SysTime.
Here's a reduced version of your test case:
---
struct Rebindable
{
union
{
int m;
immutable int i;
}
void opAssign(Rebindable another) {}
}
struct Foo3
{
// Remove the union or _timezone and dmd accepts it.
union
{
int m;
immutable int i;
}
Rebindable _timezone;
}
void main()
{
Foo3 foo3;
foo3 = Foo3();
}
---
[1] https://issues.dlang.org/show_bug.cgi?id=12885
[2] https://github.com/D-Programming-Language/dmd/pull/2665
Re: Very strange compilation error
On Wednesday 15 October 2014 22:13, John Colvin wrote: On Wednesday, 15 October 2014 at 19:29:27 UTC, Jack Applegame wrote: I don't understand why this code doesn't compile: http://dpaste.dzfl.pl/dfd8df7f80ad that should be immutable(ubyte)[] not immutable ubyte[] which is equivalent to immutable(ubyte[]). You can't overwrite immutable data, hence the error. Then Foo1 foo1; foo1 = Foo1(); // compiles shouldn't compile either.
