Struct rkyv::rel_ptr::RelPtr

pub struct RelPtr<T: ArchivePointee + ?Sized, O> { /* private fields */ }

A pointer which resolves to relative to its position in memory.

This is a strongly-typed version of RawRelPtr.

See Archive for an example of creating one.

Implementations

impl<T, O: Offset> RelPtr<T, O>

pub unsafe fn try_emplace( from: usize, to: usize, out: *mut Self ) -> Result<(), OffsetError>

Attempts to create a relative pointer from one position to another.

Safety

• from must be the position of out within the archive
• to must be the position of some valid T

pub unsafe fn emplace(from: usize, to: usize, out: *mut Self)

Creates a relative pointer from one position to another.

Panics

• The offset between from and to does not fit in an isize
• The offset between from and to exceeds the offset storage

Safety

• from must be the position of out within the archive
• to must be the position of some valid T

impl<T: ArchivePointee + ?Sized, O: Offset> RelPtr<T, O>

where T::ArchivedMetadata: Default,

pub unsafe fn try_emplace_null( pos: usize, out: *mut Self ) -> Result<(), OffsetError>

Attempts to create a null relative pointer with default metadata.

Safety

pos must be the position of out within the archive.

pub unsafe fn emplace_null(pos: usize, out: *mut Self)

Creates a null relative pointer with default metadata.

Panics

• An offset of 0 does not fit in an isize
• An offset of 0 exceeds the offset storage

Safety

pos must be the position of out within the archive.

impl<T: ArchivePointee + ?Sized, O: Offset> RelPtr<T, O>

pub unsafe fn try_resolve_emplace<U: ArchiveUnsized<Archived = T> + ?Sized>( from: usize, to: usize, value: &U, metadata_resolver: U::MetadataResolver, out: *mut Self ) -> Result<(), OffsetError>

Attempts to create a relative pointer from one position to another.

Safety

• from must be the position of out within the archive
• to must be the position of some valid T
• value must be the value being serialized
• metadata_resolver must be the result of serializing the metadata of value

pub unsafe fn resolve_emplace<U: ArchiveUnsized<Archived = T> + ?Sized>( from: usize, to: usize, value: &U, metadata_resolver: U::MetadataResolver, out: *mut Self )

Creates a relative pointer from one position to another.

Panics

• The offset between from and to does not fit in an isize
• The offset between from and to exceeds the offset storage

Safety

• from must be the position of out within the archive
• to must be the position of some valid T
• value must be the value being serialized
• metadata_resolver must be the result of serializing the metadata of value

pub unsafe fn try_resolve_emplace_from_raw_parts( from: usize, to: usize, archived_metadata: <T as ArchivePointee>::ArchivedMetadata, out: *mut Self ) -> Result<(), OffsetError>

Attempts to create a relative pointer from one position to another given raw pointer metadata.

This does the same thing as RelPtr::try_resolve_emplace but you must supply the <T as ArchivePointee>::ArchivedMetadata yourself directly rather than through an implementation of ArchiveUnsized on some value.

Safety

• from must be the position of out within the archive
• to must be the position of some valid T
• value must be the value being serialized
• archived_metadata must produce valid metadata for the pointee of the resulting RelPtr (the thing being pointed at) when <T as ArchivePointee>::pointer_metadata(archived_metadata) is called.

pub unsafe fn resolve_emplace_from_raw_parts( from: usize, to: usize, archived_metadata: <T as ArchivePointee>::ArchivedMetadata, out: *mut Self )

Creates a relative pointer from one position to another given raw pointer metadata.

This does the same thing as RelPtr::resolve_emplace but you must supply the <T as ArchivePointee>::ArchivedMetadata yourself directly rather than through an implementation of ArchiveUnsized on some value.

Panics

• The offset between from and to does not fit in an isize
• The offset between from and to exceeds the offset storage

Safety

• from must be the position of out within the archive
• to must be the position of some valid T
• value must be the value being serialized
• archived_metadata must produce valid metadata for the pointee of the resulting RelPtr (the thing being pointed at) when <T as ArchivePointee>::pointer_metadata(archived_metadata) is called.

pub fn base(&self) -> *const u8

Gets the base pointer for the relative pointer.

pub fn base_mut(&mut self) -> *mut u8

Gets the mutable base pointer for the relative pointer.

pub fn offset(&self) -> isize

Gets the offset of the relative pointer from its base.

pub fn is_null(&self) -> bool

Gets whether the offset of the relative pointer is 0.

pub fn metadata(&self) -> &T::ArchivedMetadata

Gets the metadata of the relative pointer.

pub fn as_ptr(&self) -> *const T

Calculates the memory address being pointed to by this relative pointer.

pub fn as_mut_ptr(&mut self) -> *mut T

Returns an unsafe mutable pointer to the memory address being pointed to by this relative pointer.

Trait Implementations

impl<T: ArchivePointee + ?Sized, O: Debug> Debug for RelPtr<T, O>

where T::ArchivedMetadata: Debug,

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

Formats the value using the given formatter.

impl<T: ArchivePointee + ?Sized, O: Offset> Pointer for RelPtr<T, O>

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

Formats the value using the given formatter.