Struct PageOffset 

pub struct PageOffset(pub usize);

Tuple Fields

0: usize

Implementations

impl PageOffset

pub fn calculate_page_offset( file_number: usize, offset_in_file: usize, ) -> PageOffset

This will calculate a page offset based on the max file count and the offset from the first non-zero page in a file.

Example: found file blah_blah.1 and in that file found a single non-zero page. We will return a page offset of 2 * PAGES_PER_FILE + 1

pub fn get_file_chunk_size(&self) -> usize

Gets the needed size for this offset to support resize operations

pub fn get_file_number(&self) -> usize

Gets the file number for use in opening the file chunk

pub fn get_file_seek(&self) -> usize

Gets the location to seek to in order to write to the block the page offset points at

pub fn get_bitmask_offset(&self) -> (PageOffset, usize)

Gets the position of the free/visibility mask for an offset

let page = PageOffset(100);
assert_eq!(page.get_bitmask_offset(), (PageOffset(0), 100));

pub fn is_same_file(&self, rhs: &PageOffset) -> bool

Determines if a given offset will be the same file or not

pub fn next(&self) -> PageOffset

Gets the next offset in sequence

Trait Implementations

impl Add for PageOffset

type Output = PageOffset

The resulting type after applying the + operator.

fn add(self, rhs: Self) -> Self::Output

Performs the + operation.

impl AddAssign for PageOffset

fn add_assign(&mut self, other: Self)

Performs the += operation.

impl Clone for PageOffset

fn clone(&self) -> PageOffset

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl ConstEncodedSize for PageOffset

fn encoded_size() -> usize

impl Debug for PageOffset

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for PageOffset

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Hash for PageOffset

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Mul for PageOffset

type Output = PageOffset

The resulting type after applying the * operator.

fn mul(self, rhs: Self) -> Self::Output

Performs the * operation.

impl Ord for PageOffset

fn cmp(&self, other: &PageOffset) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for PageOffset

fn eq(&self, other: &PageOffset) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for PageOffset

fn partial_cmp(&self, other: &PageOffset) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for PageOffset

impl Eq for PageOffset

impl StructuralPartialEq for PageOffset