On Tuesday, 5 December 2017 at 14:11:02 UTC, Shachar Shemesh
wrote:
import std.algorithm: move;
import std.stdio;
import std.string;
class A {
int val;
override string toString() const {
return "A(%s)".format(val);
}
}
struct B {
int val;
}
void main() {
B b = B(12);
B* bp = &b;
B* bp2;
writefln("bp=%s bp2=%s", bp, bp2);
move( bp, bp2 );
writefln("bp=%s bp2=%s", bp, bp2);
A a1 = new A();
a1.val = 42;
A a2;
writefln("a1=%s (%s) a2=%s (%s)", a1, cast(void*)a1, a2,
cast(void*)a2);
move( a1, a2 );
writefln("a1=%s (%s) a2=%s (%s)", a1, cast(void*)a1, a2,
cast(void*)a2);
B b2;
writefln("b=%s b2=%s", b, b2);
move( b, b2 );
writefln("b=%s b2=%s", b, b2);
}
Answer:
bp=7FFFAB559970 bp2=null
bp=7FFFAB559970 bp2=7FFFAB559970
a1=A(42) (7FD1B79E9000) a2=null (null)
a1=A(42) (7FD1B79E9000) a2=A(42) (7FD1B79E9000)
b=B(12) b2=B(0)
b=B(12) b2=B(12)
"move" was supposed to initialize "source" to init. This does
not appear to be the case. Is that a bug? Where?
```
b=B(12) b2=B(0)
b=B(12) b2=B(12)
```
bit will change if you declare destructor in your struct. As per
the documentation:
If T is a struct with a destructor or postblit defined, source
is reset to its .init value after it is moved into target,
otherwise it is left unchanged.
as for others I understand you have the same problem here - per
documentation, these are not structs with destructors, so moving
the pointers (references) doesn't clear the source one.
