Getting action on your favorite D issues

[David Gileadi]

On 6/5/20 5:25 PM, H. S. Teoh wrote:
> On Fri, Jun 05, 2020 at 04:53:28PM -0700, H. S. Teoh via Digitalmars-d wrote:
>> On Fri, Jun 05, 2020 at 11:57:39PM +0200, ag0aep6g via Digitalmars-d wrote:
>> [...]
>>> 2) "bool can be both true and false"
>>> https://issues.dlang.org/show_bug.cgi?id=20148
>>>
>>> This one is just silly.
>> [...]
>>
>> Nah, it's not silly, it's just that DMD's backend produces code that
>> exhibits quantum uncertainty:
> [...]
> 
> For even more quantum fun:
> 
> ----------
> bool schrodingersCat() @safe {
> 	import std.random;
> 	union Box { bool b; int state; }
> 	Box u;
> 	u.state = uniform(2, int.max);
> 	return u.b;
> }
> void main() @safe {
> 	import std.stdio;
> 	bool b = schrodingersCat();
> 	if (b) writeln("alive");
> 	if (!b) writeln("dead");
> }
> ----------
> 
> With LDC, this code will output either "alive" or "dead" with a roughly
> 50% probability of each.  So it's a classical observer.
> 
> With DMD, however, this code will perceive the quantum superimposition
> directly and output both "alive" and "dead" every time.
> 
> :-D
> 
> //
> 
> OK, I'll stop now. :-P
> 
> 
> T
> 

These two posts made me very amused. Thank you.