Re: Find the heir.
On Sunday, 29 March 2020 at 15:07:37 UTC, Simen Kjærås wrote:
On Sunday, 29 March 2020 at 14:04:53 UTC, TodNaz wrote:
Hello!
class A
{
...
}
class B : A
{
...
}
class C : A
{
...
}
A example1;
B example2 = new B(...);
A = example2;
auto heir = A.whoheir(); ///
The question in this code is: is it possible to track the
class inheritor? Or is it beyond D?
Sorry if the question is fool ...
The question is a bit unclear - what is whoheir expected to
return? This is one way that may or may not fulfill your
requirements:
module foo;
class A {
string whoheir() {
return typeid(this).name;
}
}
class B : A {}
class C : A {}
unittest {
A a = new B();
assert(a.whoheir == "foo.B");
a = new C();
assert(a.whoheir == "foo.C");
}
--
Simen
to extend on this: typeid(...) returns a TypeInfo so you can
perform a bit of runtime reflection, see
https://dlang.org/phobos/object.html#.TypeInfo
To check for exact matches if your class is B or C, you can also
use
typeid(variable) == typeid(B)
if you don't want to compare arbitrary strings. (better code
style)
There are also libraries to help you do this sort of runtime
reflection like witchcraft:
https://code.dlang.org/packages/witchcraft
or a more current hunt fork, though I don't know yet what it
changes: https://github.com/huntlabs/hunt-reflection
Re: Find the heir.
On Sunday, 29 March 2020 at 14:04:53 UTC, TodNaz wrote:
Hello!
class A
{
...
}
class B : A
{
...
}
class C : A
{
...
}
A example1;
B example2 = new B(...);
A = example2;
auto heir = A.whoheir(); ///
The question in this code is: is it possible to track the class
inheritor? Or is it beyond D?
Sorry if the question is fool ...
The question is a bit unclear - what is whoheir expected to
return? This is one way that may or may not fulfill your
requirements:
module foo;
class A {
string whoheir() {
return typeid(this).name;
}
}
class B : A {}
class C : A {}
unittest {
A a = new B();
assert(a.whoheir == "foo.B");
a = new C();
assert(a.whoheir == "foo.C");
}
--
Simen
Re: Find the heir.
On Sunday, 29 March 2020 at 14:04:53 UTC, TodNaz wrote:
Hello!
class A
{
...
}
class B : A
{
...
}
class C : A
{
...
}
A example1;
B example2 = new B(...);
A = example2;
auto heir = A.whoheir(); ///
The question in this code is: is it possible to track the class
inheritor? Or is it beyond D?
Sorry if the question is fool ...
It is not generally known who has inherited a class from the
parents perspective.
Find the heir.
Hello!
class A
{
...
}
class B : A
{
...
}
class C : A
{
...
}
A example1;
B example2 = new B(...);
A = example2;
auto heir = A.whoheir(); ///
The question in this code is: is it possible to track the class
inheritor? Or is it beyond D?
Sorry if the question is fool ...
