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:
```d
int readNumber()
{
return read!int(val => to!int(val), "number");
}
string readTime()
{
return read!string(val => toTime(val), "time");
}
private T read(T)(T function(string) transform, string typeName)
{
string input = readln();
return transform(input);
}
```
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?
