On Thursday, 7 July 2016 at 09:33:38 UTC, Arafel wrote:
Hi!
I am seeing what it seems to me a very strange behavior with
rbtrees:
---
import std.stdio;
import std.container.rbtree;
public struct A {
public int i;
public this (int _i) {
this.i = _i;
}
}
public struct B {
public auto col = new RedBlackTree!(A,"a.i < b.i");
}
void main() {
B b1;
B b2;
b1.col.insert(A(5));
static assert(&b1 != &b2);
assert(&(b1.col) != &(b2.col));
writeln(b1.col.length, " ", b2.col.length);
writeln(b1.col[], " ", b2.col[]);
}
---
I get the (to me) surprising result of:
---
1 1
[A(5)] [A(5)]
---
Is this the expected result? If so, why? I'd have expected two
new empty but different rbtrees to be created, and in fact
that's what happen if I declare them as local variables inside
main().
In this case, two different rbtrees are indeed created (as seen
with the assertion), but they apparently point to the same
underlying data...
Thanks!
Initially it looks very surprising, but then if you add
`writeln(B.init.col[]);` you can easily find out what's going on.
And I'm quite sure it's expected behaviour.
