On Sunday, 28 June 2020 at 21:01:36 UTC, NonNull wrote:
On Sunday, 28 June 2020 at 20:59:59 UTC, NonNull wrote:
Using gdc (Ubuntu 8.4.0-1ubuntu1~18.04) 8.4.0
Please criticize:
struct refer(T) {
T* ptr;
this(ref T x) { ptr = &x; }
ref T _() { return *ptr; }
alias _ this;
string toString() { import std.conv; return to!string(*ptr);
}
}
This will make a reference variable (simulation). [ toString()
is just for writeln. ]
void main() {
int i = 100;
refer!int j = i;
j = 3;
writeln(i);
i = 100;
writeln(j);
j += 3;
writeln(i);
refer!int k = j;
writeln(k);
}
And a refer!int can be returned as it is just a value.
Returning one that contains a pointer to a local variable
leads to a compilation error.
* does not lead to a compilation error
Now with a different compiler I this:
Deprecation: Cannot use alias this to partially initialize
variable j of type refer. Use j._()
This is for the line j=3
What is this about? Where does this hidden rule come from?
