October 14, 2008 scope and raising from constructor | ||||
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Hi all, I've posted this on D learn, just to know: is it a bug? If yes, I'll post a ticket... If not, I don't understand the difference behaviour... Thanks, Paolo module tests.d.scopes.t02.test; class Resource { static int allocated = 0; this( bool mustThrow = false ){ allocated ++; if( mustThrow ) throw new Exception("bang"); } ~this(){ allocated --; } } class Factory { Resource resource(bool b=false){ return new Resource(b); } } import std.gc, std.stdio; void main(){ // In this case everything it's ok { try { scope r1 = new Resource(true); assert( false ); } catch(Exception e){} assert( Resource.allocated == 1); std.gc.fullCollect(); assert( Resource.allocated == 1 ); } Resource.allocated = 0; // In this case the destructor IS called, only on collect... { auto f = new Factory(); try { scope r1 = f.resource(true); assert( false ); } catch(Exception e){} assert( Resource.allocated == 1); std.gc.fullCollect(); assert( Resource.allocated == 0 ); // Dho! Destructor called! } } |
October 14, 2008 Re: scope and raising from constructor | ||||
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Posted in reply to Paolo Invernizzi | On Tue, 14 Oct 2008 11:51:27 +0400, Paolo Invernizzi <arathorn@fastwebnet.it> wrote:
> Hi all,
> I've posted this on D learn, just to know: is it a bug? If yes, I'll post a ticket...
> If not, I don't understand the difference behaviour...
> Thanks, Paolo
>
> module tests.d.scopes.t02.test;
>
> class Resource {
> static int allocated = 0;
> this( bool mustThrow = false ){
> allocated ++;
> if( mustThrow ) throw new Exception("bang");
> }
> ~this(){
> allocated --;
> }
> }
> class Factory {
> Resource resource(bool b=false){
> return new Resource(b);
> }
> }
>
> import std.gc, std.stdio;
> void main(){
> // In this case everything it's ok
> {
> try {
> scope r1 = new Resource(true);
> assert( false );
> }
> catch(Exception e){}
> assert( Resource.allocated == 1);
> std.gc.fullCollect();
> assert( Resource.allocated == 1 );
> }
> Resource.allocated = 0;
> // In this case the destructor IS called, only on collect...
> {
> auto f = new Factory();
> try {
> scope r1 = f.resource(true);
> assert( false );
> }
> catch(Exception e){}
> assert( Resource.allocated == 1);
> std.gc.fullCollect();
> assert( Resource.allocated == 0 ); // Dho! Destructor called!
> }
> }
I think there is no need to post it twice across different newsgroups, most of the people monitor all or none of them.
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