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use syn::Generics;
use crate::usage::{IdentSet, LifetimeSet};
/// Extension trait for pulling specific generics data from a generics AST representation.
pub trait GenericsExt {
/// Get the set of all lifetimes declared by the syntax element.
/// This does not look for usage of the lifetime; see `UsesLifetimes` for that.
fn declared_lifetimes(&self) -> LifetimeSet;
/// Get the set of all type parameters declared by the syntax element.
/// This does not look for usage of the type parameter; see `UsesTypeParams` for that.
fn declared_type_params(&self) -> IdentSet;
}
impl GenericsExt for Generics {
fn declared_lifetimes(&self) -> LifetimeSet {
self.lifetimes().map(|lt| lt.lifetime.clone()).collect()
}
fn declared_type_params(&self) -> IdentSet {
self.type_params().map(|tp| tp.ident.clone()).collect()
}
}