Re: mutable pointers as associative array keys
On Monday, 10 April 2023 at 20:31:43 UTC, Steven Schveighoffer wrote: On 4/10/23 4:25 PM, Steven Schveighoffer wrote: It's also completely useless. Having const keys does nothing to guarantee unchanging keys. Another half-assed attempt to be encode correct semantics but fails completely in its goal. In case you wonder how old this is: https://issues.dlang.org/show_bug.cgi?id=11477 https://issues.dlang.org/show_bug.cgi?id=12491#c2 -Steve Oh dear.
Re: mutable pointers as associative array keys
On 4/10/23 4:25 PM, Steven Schveighoffer wrote: It's also completely useless. Having const keys does nothing to guarantee unchanging keys. Another half-assed attempt to be encode correct semantics but fails completely in its goal. In case you wonder how old this is: https://issues.dlang.org/show_bug.cgi?id=11477 https://issues.dlang.org/show_bug.cgi?id=12491#c2 -Steve
Re: mutable pointers as associative array keys
On 4/10/23 2:14 PM, John Colvin wrote: It seems that it isn't possible, am I missing something? alias Q = int[int*]; pragma(msg, Q); // int[const(int)*] Yep, it's been that way forever. Only with pointers and arrays. It's fine with mutable classes and structs (even if they contain pointers). Also, is this documented somewhere? No. It's also completely useless. Having const keys does nothing to guarantee unchanging keys. Another half-assed attempt to be encode correct semantics but fails completely in its goal. -Steve
Re: mutable pointers as associative array keys
On Monday, 10 April 2023 at 18:14:56 UTC, John Colvin wrote:
It seems that it isn't possible, am I missing something?
alias Q = int[int*];
pragma(msg, Q); // int[const(int)*]
Also, is this documented somewhere?
It seems to be so (which is strange) and I can't image it is by
design since you
can do this:
```d
static struct Pointer(T) { T* val; }
int[Pointer!int] f;
pragma(msg,typeof(f));
int* val = new int;
*val = 5;
f[Pointer!int(val)] = 12;
*val = 6;
f[Pointer!int(val)].writeln; //12
```
mutable pointers as associative array keys
It seems that it isn't possible, am I missing something? alias Q = int[int*]; pragma(msg, Q); // int[const(int)*] Also, is this documented somewhere?
