Struct nanvm_lib::common::bit_subset64::BitSubset64

pub struct BitSubset64<T: Cast<u64> = u64>
where
    u64: Cast<T>,
{
    pub tag: u64,
    pub mask: u64,
    /* private fields */
}

A bit subset of u64.

This structure represents a subset of bits within a 64-bit unsigned integer, defined by a specific pattern where each bit is either 0, 1, or S.

• 0 means the bit is always 0. These bits contribute to both the tag and the mask.
• 1 means the bit is always 1. These bits also contribute to both the tag and the mask.
• S represents a superposition state, meaning the bit can be either 0 or 1.

The cardinality of the set is calculated as 2^(superposition.count_ones()), representing the number of unique combinations possible within the superposition bits.

The following table summarizes how each field is derived:

Property	0	1	S	Description
union	0	1	1	items.reduce(or)
tag	0	1	0	items.reduce(and)
superposition	0	0	1	union ^ tag
mask	1	1	0	!superposition

Fields

tag: u64

Represents the intersection of all items in the subset. A pattern of bits where a 1 in each position indicates that the corresponding bit is consistently 1 across all items, and a 0 indicates that it is not consistently 1.

mask: u64

Identifies the bits that are constant (either 0 or 1). A 1 in a position indicates a fixed bit (as per the tag), and a 0 indicates a superposition bit.

Implementations

impl BitSubset64<u64>

pub const fn cast<U: Cast<u64>>(self) -> BitSubset64<U>

where u64: Cast<U>,

impl<T: Cast<u64>> BitSubset64<T>

where u64: Cast<T>,

pub const fn from_tag_and_mask(tag: u64, mask: u64) -> Self

pub const fn from_tag_and_superposition(tag: u64, sup: u64) -> Self

pub const fn from_tag_and_union(tag: u64, union: u64) -> Self

pub const fn from_tag(tag: u64) -> Self

pub const fn has(self, value: u64) -> bool

pub const fn union(self) -> u64

pub const fn superposition(self) -> u64

pub const fn or_unchecked(self, b: Self) -> Self

pub const fn or(self, b: Self) -> Self

pub const fn and(self, b: Self) -> Self

pub const fn split(self, sub_mask: u64) -> (Self, Self)

pub const fn raw_value_to_subset_value(self, value: u64) -> u64

pub fn typed_value_to_subset_value(self, value: T) -> u64

pub fn subset_value_to_typed_value(self, set: u64) -> T

Trait Implementations

impl<T: Cast<u64>> Clone for BitSubset64<T>

where u64: Cast<T>,

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Cast<u64>> Copy for BitSubset64<T>

where u64: Cast<T>,