On Tuesday, 17 April 2018 at 11:38:17 UTC, Jonathan M Davis wrote:
On Sunday, April 15, 2018 17:59:01 Dgame via
Digitalmars-d-learn wrote:
How am I supposed to insert a struct with immutable members
into an assoc. array?
Reduced example:
----
struct A {
immutable string name;
}
A[string] as;
as["a"] = A("a"); // Does not work
----
I would point out that in general, having const or immutable
fields in a struct is a terrible idea. It causes all kinds of
problems because stuff like assignment doesn't work. If you
want the field to be read-only, you'll have far fewer problems
if you simply use a function to access it instead of making the
member public. e.g.
struct A
{
public:
@property string name() { return _name; }
private:
string _name;
}
The problem you're having here is just one example of the list
of things that don't work if you have a struct with immutable
members. It looks like the AA probably is doing something like
initializing the entry with A.init and then assigning it the
new value, and that's not going to work if the struct has
immutable members - which is exactly what the error message
says.
- Jonathan M Davis
That's how I solved it. But it is troublesome and annoying
because it increases the amount of manually work I have to do.
