Struct StdImplCache 

pub struct StdImplCache { /* private fields */ }

Cache of known trait implementations for standard library types.

This is a static cache that knows which primitives and std types implement common traits like Clone, Default, Debug, etc.

Implementations

impl StdImplCache

pub fn new() -> Self

Create a new cache with default implementations.

pub fn has_impl(&self, type_name: &str, trait_name: &str) -> bool

Check if a type implements a trait.

pub fn is_checkable_derive(&self, trait_name: &str) -> bool

Check whether trait_name is a std-derivable trait whose impl relationships this cache can authoritatively answer.

Only the nine traits that #[derive(...)] can expand to from std (Clone, Copy, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash) are checkable. Proc-macro derives such as serde::Serialize / serde::Deserialize / thiserror::Error / clap::Subcommand generate impls for std types that cannot be enumerated statically, so asking has_impl("String", "Serialize") would return a false “missing”. Such derives must be skipped, not reported as a precheck failure.

pub fn is_primitive(&self, type_name: &str) -> bool

Check if a type is a known primitive.

pub fn is_std_container(&self, type_name: &str) -> bool

Check if a type is a known std container.

pub fn traits_for(&self, type_name: &str) -> Vec<&'static str>

Get all traits a type is known to implement.

Trait Implementations

impl Clone for StdImplCache

fn clone(&self) -> StdImplCache

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for StdImplCache

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

Formats the value using the given formatter.

impl Default for StdImplCache

fn default() -> Self

Returns the “default value” for a type.