Makes Graph and Dataset implement Clone

lib/oxrdf/src/dataset.rs

@@ -62,7 +62,7 @@ use std::hash::{Hash, Hasher};
 /// assert_eq!(vec![TripleRef::new(ex, ex, ex)], results);
 /// # Result::<_,Box<dyn std::error::Error>>::Ok(())
 /// ```
-#[derive(Debug, Default)]
+#[derive(Debug, Default, Clone)]
 pub struct Dataset {
     interner: Interner,
     gspo: BTreeSet<(

lib/oxrdf/src/graph.rs

@@ -48,7 +48,7 @@ use std::fmt;
 /// assert_eq!(vec![triple], results);
 /// # Result::<_,Box<dyn std::error::Error>>::Ok(())
 /// ```
-#[derive(Debug, Default)]
+#[derive(Debug, Default, Clone)]
 pub struct Graph {
     dataset: Dataset,
 }

lib/oxrdf/src/interning.rs

@@ -4,7 +4,7 @@ use crate::*;
 use std::collections::hash_map::{Entry, HashMap, RandomState};
 use std::hash::{BuildHasher, Hasher};
 
-#[derive(Debug, Default)]
+#[derive(Debug, Default, Clone)]
 pub struct Interner {
     hasher: RandomState,
     string_for_hash: HashMap<u64, String, IdentityHasherBuilder>,
@@ -503,7 +503,7 @@ impl InternedTriple {
     }
 }
 
-#[derive(Default)]
+#[derive(Default, Clone)]
 struct IdentityHasherBuilder;
 
 impl BuildHasher for IdentityHasherBuilder {