Struct libpijul::pristine::sanakirja::UnsafePathId

pub struct UnsafePathId { /* fields omitted */ }

An internal "unsafe" version of a [pristine::PathId], used to circumvent the absence of associated type constructors in Rust (else this would be borrow on a table).

Implementations

impl UnsafePathId

pub fn from_fileid(f: PathId<'_>) -> UnsafePathId

pub unsafe fn to_fileid<'a>(&self) -> PathId<'a>

Trait Implementations

impl Clone for UnsafePathId

pub fn clone(&self) -> UnsafePathId

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for UnsafePathId

impl Debug for UnsafePathId

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

Formats the value using the given formatter.

impl Representable for UnsafePathId

pub fn alignment() -> Alignment

Alignment of this type. Allowed values are 1, 2, 4 and 8.

pub fn onpage_size(&self) -> u16

How much space this value occupies on the page (not counting alignment padding).

pub unsafe fn write_value(&self, p: *mut u8)

Write this value to a u8 pointer, guaranteed to be a multiple of self.alignment().

pub unsafe fn read_value(p: *const u8) -> Self

Read value from an onpage pointer, guaranteed to be a multiple of self.alignment().

pub unsafe fn cmp_value<T>(&self, _: &T, x: Self) -> Ordering

Compare a value with an onpage value. The current transaction is sometimes helpful, for instance when the page only stores a pointer to another page.

type PageOffsets = Empty<u64>

An iterator over the offsets to pages contained in this value. Only values from this crate can generate non-empty iterators, but combined values (like tuples) must chain the iterators returned by method page_offsets.

pub fn page_offsets(&self) -> Self::PageOffsets

If this value is an offset to another page at offset offset, return Some(offset). Return None else.

pub unsafe fn skip(p: *mut u8) -> *mut u8

First pointer strictly after this value's pointer. The default implementation is basically p.offset(self.onpage_size() as isize), but their might be more efficient implementations in some cases.

pub fn drop_value<E, T, R>(
    &self,
    &mut MutTxn<E, T>,
    &mut R
) -> Result<(), Error> where
    E: Borrow<Env<Exclusive>>,
    R: Rng, 

How to free the pages used by this value. The default implementation doesn't do anything, which is fine for types stored directly on B tree pages.