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:
S(v)
However, the following program compiles and the resulting execution indicates the bits are just being reinterpreted.
// casttest.d
import std;
struct Foo {
int i;
float x;
}
struct Bar {
float i;
int x;
}
void main(){
Foo foo = Foo(10, 1.035);
writeln(foo);
auto b = cast(Bar)foo;
writeln(b);
auto c = cast(Bar)b;
writeln(c);
// auto d = Bar(foo); // casttest.d(21): Error: cannot implicitly convert expression `foo` of type `Foo` to `float`
// auto e = Bar(b); // casttest.d(22): Error: cannot implicitly convert expression `b` of type `Bar` to `float`
}
Execution results in:
Foo(10, 1.035)
Bar(1.4013e-44, 1065646817)
Bar(1.4013e-44, 1065646817)
Additionally, the commented out lines indicate that what the spec claims the cast is equivalent to wouldn’t even work.
Is this a bug in my understanding? Bug in the spec? Bug in the compiler?