I can't find a way to use a pure constructor to create both
mutable and immutable instances of the same class, when one of
the fields I assign is a string.
This works fine:
class A
{
int value;
this(int value_) pure
{
this.value = value_;
}
}
auto a_mutable = new A(1);
auto a_immutable = new immutable A(2);
But if I change the field to a string, I get a compilation error:
class B
{
string value;
this(string value_) pure
{
this.value = value_;
}
}
auto b_mutable = new B("foo");
auto b_immutable = new immutable B("bar");
giving a compilation error for the last row:
Error: mutable method B.this is not callable using a immutable
object
forcing me to use two separate constructors, which works fine:
class B
{
string value;
this(string value_)
{
this.value = value_;
}
this(string value_) immutable
{
this.value = value_;
}
}
The question is: am I missing something that would make it
possible to use a pure constructor in this case, or is it simply
not possible?
