tags 890294 + fixed-upstream
thanks
> Hello! Following piece of code is meant to create wrapper structures
> around primitive types, simplifying creation of generic code.
I attach the answer of upstream - he has fixed the code to give a better
error message, and also gives a way to produce a working code.
Thanks
Norbert
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PREINING Norbert http://www.preining.info
Accelia Inc. + JAIST + TeX Live + Debian Developer
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Hi Norbert,
Thanks for sending on this interesting example. On my system this causes an
assert. I have fixed this in
commit fc0cc036f6b3733fba8b43bf5068b009fddb6bdc 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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