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)
`
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)
```
However, the following program compiles and the resulting
Mariusz `shd` Gliwiński:
* it's currently safe
One thing to remember when casting, is that when you cast
const/immutable to mutable, then you can't mutate the data.
Bye,
bearophile
I'd like to reinterpret data as different type without copying.
extern(C) struct A{ /* */ }
struct B
{
A a;
alias a this;
}
extern(C) A* f1(){ /* */ }
B* f2()
{
return cast(B*) f1();
}
Assuming that i cast() correct state, i'd like to know if:
* it's currently safe
* it's guaranteed to b
