Casting between structs of the same size is treated as a bit cast?
jfondren
julian.fondren at gmail.com
Wed Oct 20 04:26:20 UTC 2021
On Wednesday, 20 October 2021 at 04:14:37 UTC, Dave P. wrote:
> I am confused on how casting structs works. According to point
> 9 of https://dlang.org/spec/expression.html#CastExpression:
>
>> Casting a value v to a struct S, when value is not a struct of
>> the same type, is equivalent to:
>>
>> ```d
>> S(v)
>> ```
It says `value v` and `struct S`, but you go on to cast a struct
into another struct.
Point 9 is exhibited by
```d
struct Foo {
int i;
}
unittest {
int n = 2;
Foo f = cast(Foo) n;
}
```
> However, the following program compiles and the resulting
> execution indicates the bits are just being reinterpreted.
...
> Is this a bug in my understanding? Bug in the spec? Bug in the
> compiler?
It looks at least like a gap in the spec. Adding "or a struct to
another struct" to point six would fit the observed behavior.
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