- To: vectorgraphics/asymptote <asymptote@noreply.github.com>
- Cc: Norbert Preining <norbert@preining.info>, Author <author@noreply.github.com>
- Subject: Re: [vectorgraphics/asymptote] Core dump wrt to typedef and wrappers (#59)
- From: John Bowman <notifications@github.com>
- Date: Sat, 17 Feb 2018 07:03:15 +0000 (UTC)
- Message-id: <vectorgraphics/asymptote/issues/59/366422581@github.com>
- Reply-to: vectorgraphics/asymptote <reply+001a7ba55e3a4a2c9e4f893d0174b618bd9521d248cd0de392cf00000001169f95b392a169ce11b84764@reply.github.com>
- In-reply-to: <vectorgraphics/asymptote/issues/59@github.com>
- References: <vectorgraphics/asymptote/issues/59@github.com>
Hi Norbert,
Thanks for sending on this interesting example. On my system this causes an assert. I have fixed this in
commit fc0cc03 to generate a more informative error:
/u/bowman/camp/test76.asy: 5.35: cannot convert 'real' to 'int' in assignment
/u/bowman/camp/test76.asy: 6.32: cannot cast 'Aint' to 'Areal'
The problem is that the quote code does not get re-evaluated with the new typedefs, but this is easy to fix with two nested evals:
`void define_wrapper(string type)
{
string wrapper="A"+type;
eval("var casts=quote {"+
"public struct "+wrapper+"{ "+type+" value; };"
"typedef "+wrapper+" TWrap;"+
"typedef "+type+" TInner;"+
"public TWrap operator cast(TInner value) {
var obj=new TWrap;
obj.value=value;
return obj;
}
public TInner operator cast(TWrap obj) {
return obj.value;
}
};
eval(casts,true);",true);
}
define_wrapper("int");
define_wrapper("real");
Aint x;
Areal y;
x.value=1;
y.value=pi;
write(x.value);
write(y.value);
`
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