Trait rustc_data_structures::tagged_ptr::Tag
source · pub unsafe trait Tag: Copy {
const BITS: u32;
// Required methods
fn into_usize(self) -> usize;
unsafe fn from_usize(tag: usize) -> Self;
}
Expand description
Required Associated Constants§
sourceconst BITS: u32
const BITS: u32
Number of least-significant bits in the return value of into_usize
which may be non-zero. In other words this is the bit width of the
value.
Required Methods§
sourcefn into_usize(self) -> usize
fn into_usize(self) -> usize
Turns this tag into an integer.
The inverse of this function is from_usize
.
This function guarantees that only the least-significant Self::BITS
bits can be non-zero.
sourceunsafe fn from_usize(tag: usize) -> Self
unsafe fn from_usize(tag: usize) -> Self
Re-creates the tag from the integer returned by into_usize
.
Safety
The passed tag
must be returned from into_usize
.