On Monday, 11 January 2021 at 18:51:04 UTC, Jack wrote:
Here's what I'm trying to make to work:
import std.container : SList;
class C
{
static immutable Foo = new C();
// ....
}
alias Callback = void function(const C, int);
void main()
{
auto l = SList!Callback();
auto a = (C c, int d) { };
auto b = (C c, int d) { };
auto c = (const C c, int d) { };
l.insert(a);
l.insert(b);
l.insert(c);
}
I'm assuming that you then want to call the callbacks on mutable
and immutable `C`s like `C.Foo`.
You have to add `const` to the `a` and `b` functions, too:
auto a = (const C c, int d) { };
auto b = (const C c, int d) { };
Without those `const`s, you have callbacks with mutable
parameters being called on an immutable object. That cannot work.
