Struct LifetimeEnv 

pub struct LifetimeEnv { /* private fields */ }

A lifetime dependency graph used for tracking which lifetimes outlive, and are outlived by, other lifetimes.

It is similar to [syn::LifetimeDef], except it can also track lifetime bounds defined in the where clause.

Implementations

impl LifetimeEnv

pub fn names(&self) -> impl Iterator<Item = &NamedLifetime> + Clone

Iterate through the names of the lifetimes in scope.

pub fn from_method_item( method: &ImplItemFn, impl_generics: Option<&Generics>, self_param: Option<&SelfParam>, params: &[Param], return_type: Option<&TypeName>, ) -> Self

Returns a LifetimeEnv for a method, accounting for lifetimes and bounds defined in both the impl block and the method, as well as implicit lifetime bounds in the optional self param, other param, and optional return type. For example, the type &'a Foo<'b> implies 'b: 'a.

pub fn from_struct_item( strct: &ItemStruct, fields: &[(Ident, TypeName, Docs)], ) -> Self

Returns a LifetimeEnv for a struct, accounding for lifetimes and bounds defined in the struct generics, as well as implicit lifetime bounds in the struct’s fields. For example, the field &'a Foo<'b> implies 'b: 'a.

pub fn len(&self) -> usize

Returns the number of lifetimes in the graph.

pub fn is_empty(&self) -> bool

Returns true if the graph contains no lifetimes.

pub fn lifetimes_to_tokens(&self) -> TokenStream

<'a, 'b, 'c>

Write the existing lifetimes, excluding bounds, as generic parameters.

To include lifetime bounds, use [LifetimeEnv::lifetime_defs_to_tokens].

Trait Implementations

impl Clone for LifetimeEnv

fn clone(&self) -> LifetimeEnv

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LifetimeEnv

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for LifetimeEnv

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for LifetimeEnv

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

Formats the value using the given formatter.

impl Hash for LifetimeEnv

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for LifetimeEnv

fn eq(&self, other: &LifetimeEnv) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for LifetimeEnv

Serialize a LifetimeEnv as a map from lifetimes to their bounds.

fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>

where S: Serializer,

Serialize this value into the given Serde serializer.

impl ToTokens for LifetimeEnv

fn to_tokens(&self, tokens: &mut TokenStream)

Write self to the given TokenStream.

fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object.

fn into_token_stream(self) -> TokenStream

where Self: Sized,

Convert self directly into a TokenStream object.

impl Eq for LifetimeEnv

impl StructuralPartialEq for LifetimeEnv

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 24 bytes