Struct memory_pager::Pager

pub struct Pager { /* fields omitted */ }

Memory pager instance. Manages Page instances.

Methods

impl Pager

pub fn new(page_size: usize) -> Self

Create a new Pager instance with a page_size.

pub fn with_pages(page_size: usize, pages: Vec<Option<Page>>) -> Self

Create a new Pager instance with a page_size and pages. Useful to restore a Pager instance from disk.

pub fn get_mut_or_alloc(&mut self, page_num: usize) -> &mut Page

Get a Page mutably. The page will be allocated on first access.

pub fn get(&self, page_num: usize) -> Option<&Page>

Get a Page wrapped in an Option enum. Does not allocate on access.

pub fn get_mut(&mut self, page_num: usize) -> Option<&mut Page>

Get a mutable Page wrapped in an Option enum. Does not allocate on access.

pub fn len(&self) -> usize

The number of pages held by memory-pager. Doesn't account for empty entries. Comparable to vec.len() in usage.

pub fn is_empty(&self) -> bool

check whether the length is zero.

pub fn page_size(&self) -> usize

Get the memory page size in bytes.

Important traits for Iter<'a>

impl<'a> Iterator for Iter<'a> type Item = &'a Option<Page>;

pub fn iter(&self) -> Iter

Iterate over &Pages.

Trait Implementations

impl Debug for Pager

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

Formats the value using the given formatter.

impl Default for Pager

Create a new Pager instance with a page_size of 1024.

fn default() -> Self

Returns the "default value" for a type.