Ok a follow-up to my previous email, it has nothing to do with opAssign in
particular. Any function that takes an argument by value, pass it the result
of a function that returns a reference and it won't call the postblit.
Calling it with a ref argument on the other hand works properly:
import std.stdio;
struct Test {
this( this ) { writeln( "Test.this(this)" ); }
~this() { writeln( "Test.~this()" ); }
}
ref Test returnsRef( ref Test x ) { return x; }
void takesVal( Test x ) {}
void takesRef( ref Test x ) {
takesVal( x );
}
int main() {
Test x;
writeln( "-- with ref argument (works)" );
takesRef( x );
writeln( "-- with ref return (doesn't work)" );
takesVal( returnsRef( x ) );
writeln( "-- done");
return 0;
}
I'm starting to be pretty sure this is a bug.
---
Cristi Cobzarenco
BSc in Artificial Intelligence and Computer Science
University of Edinburgh
Profile: http://www.google.com/profiles/cristi.cobzarenco
On 23 June 2011 19:37, Cristi Cobzarenco <cristi.cobzare...@gmail.com>wrote:
> ------------------------------
> import std.stdio;
>
> struct Test {
> this( this ) { writeln( "Test.this(this)" ); }
> ~this() { writeln( "Test.~this()" ); }
> void opAssign( Test rhs ) { writeln( "Test.opAssign" ); }
> }
>
> ref Test makeRef( ref Test test ) { return test; }
>
> int main(string[] argv) {
> Test x,y;
> writeln( "Before assignment" );
> x = makeRef(y);
> writeln( "After assignment" );
> readln();
> return 0;
> }
>
>
> ------------------------------
> Output:
>
> Before assignment
> Test.opAssign
> Test.~this()
> After assignment
> Test.~this()
> Test.~this()
> ------------------------------
>
> The code above assigns a reference to a Test object to another Test object.
> The assignment doesn't call the postblit constructor, yet it calls the
> destructor (lines 2,3 in the output). Changing the assignment to "x = y;"
> makes it call the postblit.
> Is this correct behaviour, or should I file it as a bug?
>
> ---
> Cristi Cobzarenco
> BSc in Artificial Intelligence and Computer Science
> University of Edinburgh
> Profile: http://www.google.com/profiles/cristi.cobzarenco
>
>
