|Posted by Steven Schveighoffer|
in reply to harakim
Posted in reply to harakim
On 6/17/22 8:48 AM, harakim wrote:
On Friday, 17 June 2022 at 12:31:45 UTC, harakim wrote:
I can generically convert a string to a type using to!type. I have a read function that does that. I have simplified the example below:
return read!int(val => to!int(val), "number");
return read!string(val => toTime(val), "time");
private T read(T)(T function(string) transform, string typeName)
string input = readln();
However, I want to be able to convert my own custom types as well. How do I do that? Is there an operator overload I need to override for that? Do I have to static if on the template type and call the object?
I have no idea why I was stuck on this problem for so long. I can specify anything I want in the transform and I even do in my own example lol. I am still curious if there is a way to make your type work with to!MyCustomType(source)
to uses natural hints that it can find via introspection. As others have pointed out, you can define a constructor in the target type to take the source type. To go the other way, you can define an
opCast in the source type (if that's possible). If you want to convert to string (a specialized case), use a
toString member function.
For class to class conversion,
to will try a dynamic cast if none of the above is the case.
I believe there is no specific hook aside from these that allows you to define a conversion path.