Struct LazyPropMap 

pub struct LazyPropMap<V>(Option<Box<PropMap<V>>>);

空のうちは確保しない PropMap（8 バイト）。

【2026-10-19】Obj は props/accessors/attrs の 3 つの IndexMap（各 56 バイト）を 持ち 256 バイトあった。getter/setter と属性はほとんどのオブジェクトで空なので、 中身ができたときだけ確保する。YouTube の kevlar_base（10.8MB）の実行で 512MB のヒープを使い切っていた。

Tuple Fields

0: Option<Box<PropMap<V>>>

Implementations

impl<V> LazyPropMap<V>

fn map_mut(&mut self) -> &mut PropMap<V>

pub fn get(&self, k: &str) -> Option<&V>

pub fn get_mut(&mut self, k: &str) -> Option<&mut V>

pub fn contains_key(&self, k: &str) -> bool

pub fn insert(&mut self, k: String, v: V) -> Option<V>

pub fn entry(&mut self, k: String) -> Entry<'_, String, V>

pub fn remove(&mut self, k: &str) -> Option<V>

IndexMap::remove と同じ（末尾と入れ替えて取り除く）。

pub fn shift_remove(&mut self, k: &str) -> Option<V>

pub fn clear(&mut self)

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn keys(&self) -> impl Iterator<Item = &String>

pub fn iter(&self) -> impl Iterator<Item = (&String, &V)>

Trait Implementations

impl<V: Clone> Clone for LazyPropMap<V>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<V> Default for LazyPropMap<V>

fn default() -> Self

Returns the “default value” for a type.

impl<V> IntoIterator for LazyPropMap<V>

type Item = (String, V)

The type of the elements being iterated over.

type IntoIter = Flatten<IntoIter<IndexMap<String, V, BuildHasherDefault<FnvHasher>>>>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<'a, V> IntoIterator for &'a LazyPropMap<V>

type Item = (&'a String, &'a V)

The type of the elements being iterated over.

type IntoIter = LazyPropIter<'a, V>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.