On Thursday, 17 March 2016 at 10:04:53 UTC, Anonymouse wrote:
On Thursday, 17 March 2016 at 09:57:37 UTC, Jeff Thompson wrote:
In the following code, I explicitly declare array as
immutable. But it compiles with the error shown below in the
comment. The array object is declared immutable, so how can
the compiler say it is a mutable object? In summary, how to
pass an immutable array to an immutable constructor?
class C {
int i;
this(immutable int[] array) immutable {
i = array[0];
}
}
void func() {
immutable int[] array = [1];
auto c = new C(array); // Error: immutable method C.this is
not callable using a mutable object
}
The error message isn't very good, but remove immutable from
the constructor and it works.
this(immutable int[] array) {
This is a simplified example from a larger class I have where I
need an immutable constructor. This is because I need to
construct an object an pass it to other functions which take an
immutable object. So, how to keep an immutable constructor?
