Trait AltrepImpl 

pub trait AltrepImpl: Clone + Debug {
    // Required method
    fn length(&self) -> usize;

    // Provided methods
    fn unserialize(_class: Robj, _state: Robj) -> Robj { ... }
    fn serialized_state(_x: SEXP) -> Robj { ... }
    fn duplicate_ex(x: SEXP, deep: bool) -> Robj { ... }
    fn duplicate(x: SEXP, _deep: bool) -> Robj { ... }
    fn coerce(_x: SEXP, _ty: Rtype) -> Robj { ... }
    fn inspect(&self, _pre: i32, _deep: bool, _pvec: i32) -> bool { ... }
    unsafe fn dataptr(x: SEXP, _writeable: bool) -> *mut u8 { ... }
    unsafe fn dataptr_or_null(x: SEXP) -> *const u8 { ... }
    fn extract_subset(_x: Robj, _indx: Robj, _call: Robj) -> Robj { ... }
}

Rust trait for implementing ALTREP. Implement one or more of these methods to generate an Altrep class. This is likely to be unstable for a while.

Required Methods

fn length(&self) -> usize

Get the virtual length of the vector. For example for a compact range, return end - start + 1.

Provided Methods

fn unserialize(_class: Robj, _state: Robj) -> Robj

Simplified constructor that is called when loading an Altrep object from a file.

fn serialized_state(_x: SEXP) -> Robj

Fetch the state of this object when writing to a file.

fn duplicate_ex(x: SEXP, deep: bool) -> Robj

Duplicate this object, possibly duplicating attributes. Currently this manifests the array but preserves the original object.

fn duplicate(x: SEXP, _deep: bool) -> Robj

Duplicate this object. Called by Rf_duplicate. Currently this manifests the array but preserves the original object.

fn coerce(_x: SEXP, _ty: Rtype) -> Robj

Coerce this object into some other type, if possible.

fn inspect(&self, _pre: i32, _deep: bool, _pvec: i32) -> bool

Print the text for .Internal(inspect(obj))

unsafe fn dataptr(x: SEXP, _writeable: bool) -> *mut u8

Get the data pointer for this vector, possibly expanding the compact representation into a full R vector.

Safety

This function dereferences a raw SEXP pointer. The caller must ensure that x is a valid SEXP pointer.

unsafe fn dataptr_or_null(x: SEXP) -> *const u8

Get the data pointer for this vector, returning NULL if the object is unmaterialized.

Safety

This function dereferences a raw SEXP pointer. The caller must ensure that x is a valid SEXP pointer.

fn extract_subset(_x: Robj, _indx: Robj, _call: Robj) -> Robj

Implement subsetting (eg. x[10:19]) for this Altrep vector.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors

impl<Iter: ExactSizeIterator + Debug + Clone> AltrepImpl for Iter