On Sunday, 30 July 2017 at 04:36:19 UTC, Ali Çehreli wrote:
On 07/29/2017 09:19 PM, Matthew Gamble wrote:
I have a class member function from which I'm trying to return
a sorted
array of key, value tuples stored in an associative array as a
private
member. The member function should be able to be marked const
to prevent
the AA from being modified. I have reduced the problem to the
simple
case below which won't compile with DMD v2.072.2.
import std.array;
import std.algorithm;
class A
{
this() { aa = ["a":1, "b" : 2, "c" : 3]; }
auto pairs() @property const { return
aa.byPair.array.sort().release; }
private:
int[string] aa;
}
If I remove const from the pairs function it compiles fine.
I'm just not
sure this is a behavior I want. Any help/recommendation would
be
appreciated.
I think it should work. I think a cast to unqualified is a safe
workaround in this case:
auto pairs() @property const { return
(cast(int[string])aa).byPair.array.sort().release; }
Ali
Thanks Ali,
That works to solve the compile problem. Seems the data in aa was
safe from modification without the const or casting, even if the
values are reference types (i.e. ClassB[string]). Is that
expected?
Best,
Matt
