Struct FuncCodeLen 

pub struct FuncCodeLen(/* private fields */);

A newtype containing a function pointer dispatching the length method for a code.

This is a more efficient way to pass a CodeLen to a method, as a FuncCodeLen does not need to do a runtime test to dispatch the correct method.

Instances can be obtained by calling the new method with a variant of the Codes enum, or by calling the new_with_func method with a function pointer.

Note that since selection of the code happens in the new method, it is more efficient to clone a FuncCodeLen than to create a new one.

Implementations

impl FuncCodeLen

pub const fn new(code: Codes) -> Result<Self, DispatchError>

Returns a new FuncCodeLen for the given code.

The code is canonicalized before the lookup, so equivalent codes yield the same length function.

Errors

The method will return an error if there is no constant for the given code in FuncCodeLen.

pub const fn new_with_func(len_func: fn(u64) -> usize) -> Self

Returns a new FuncCodeLen for the given function.

pub const fn get_func(&self) -> fn(u64) -> usize

Returns the function pointer for the code.

Trait Implementations

impl Clone for FuncCodeLen

fn clone(&self) -> FuncCodeLen

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl CodeLen for FuncCodeLen

Here we do not depend on the bitstream, so there is no need for a “static” version of the trait.

fn len(&self, n: u64) -> usize

Returns the length of the codeword for n.

impl Debug for FuncCodeLen

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

Formats the value using the given formatter.

impl FlatType for FuncCodeLen

where fn(u64) -> usize: MemSize + FlatType,

type Flat = True

impl MemDbgImpl for FuncCodeLen

where fn(u64) -> usize: MemDbgImpl + FlatType,

fn _mem_dbg_rec_on( &self, _memdbg_writer: &mut impl Write, _memdbg_total_size: usize, _memdbg_max_depth: usize, _memdbg_prefix: &mut String, _memdbg_is_last: bool, _memdbg_flags: DbgFlags, _memdbg_refs: &mut HashSet<usize>, ) -> Result

fn _mem_dbg_depth_on( &self, writer: &mut impl Write, total_size: usize, max_depth: usize, prefix: &mut String, field_name: Option<&str>, is_last: bool, padded_size: usize, flags: DbgFlags, dbg_refs: &mut HashSet<usize>, ) -> Result<(), Error>

fn _mem_dbg_depth_on_impl( &self, writer: &mut impl Write, total_size: usize, max_depth: usize, prefix: &mut String, field_name: Option<&str>, is_last: bool, padded_size: usize, flags: DbgFlags, dbg_refs: &mut HashSet<usize>, ref_display: RefDisplay, ) -> Result<(), Error>

Internal implementation for depth display.

impl MemSize for FuncCodeLen

where fn(u64) -> usize: MemSize + FlatType,

fn mem_size_rec( &self, _memsize_flags: SizeFlags, _memsize_refs: &mut HashMap<usize, usize>, ) -> usize

Recursive implementation that tracks visited references for deduplication.

fn mem_size(&self, flags: SizeFlags) -> usize

Returns the (recursively computed) overall memory size of the structure in bytes.

impl Copy for FuncCodeLen