Remove Box on callback traits.

src/api/events.rs

@@ -12,8 +12,7 @@ impl Engine {
     ///
     /// The callback function signature takes the following form:
     ///
-    /// > `Fn(name: &str, index: usize, context: &EvalContext)`  
-    /// > `   -> Result<Option<Dynamic>, Box<EvalAltResult>> + 'static`
+    /// > `Fn(name: &str, index: usize, context: &EvalContext) -> Result<Option<Dynamic>, Box<EvalAltResult>>`
     ///
     /// where:
     /// * `index`: an offset from the bottom of the current [`Scope`][crate::Scope] that the

src/engine.rs

@@ -115,17 +115,17 @@ pub struct Engine {
     /// Custom syntax.
     pub(crate) custom_syntax: BTreeMap<Identifier, Box<CustomSyntax>>,
     /// Callback closure for resolving variable access.
-    pub(crate) resolve_var: Option<OnVarCallback>,
+    pub(crate) resolve_var: Option<Box<OnVarCallback>>,
     /// Callback closure to remap tokens during parsing.
     pub(crate) token_mapper: Option<Box<OnParseTokenCallback>>,
 
     /// Callback closure for implementing the `print` command.
-    pub(crate) print: Option<OnPrintCallback>,
+    pub(crate) print: Option<Box<OnPrintCallback>>,
     /// Callback closure for implementing the `debug` command.
-    pub(crate) debug: Option<OnDebugCallback>,
+    pub(crate) debug: Option<Box<OnDebugCallback>>,
     /// Callback closure for progress reporting.
     #[cfg(not(feature = "unchecked"))]
-    pub(crate) progress: Option<crate::func::native::OnProgressCallback>,
+    pub(crate) progress: Option<Box<crate::func::native::OnProgressCallback>>,
 
     /// Optimize the [`AST`][crate::AST] after compilation.
     #[cfg(not(feature = "no_optimize"))]
@@ -140,7 +140,7 @@ pub struct Engine {
 
     /// Callback closure for debugging.
     #[cfg(feature = "debugging")]
-    pub(crate) debugger: Option<crate::eval::OnDebuggerCallback>,
+    pub(crate) debugger: Option<Box<crate::eval::OnDebuggerCallback>>,
 }
 
 impl fmt::Debug for Engine {

src/eval/debugger.rs

@@ -10,18 +10,13 @@ use std::prelude::v1::*;
 
 /// A standard callback function for debugging.
 #[cfg(not(feature = "sync"))]
-pub type OnDebuggerCallback = Box<
-    dyn Fn(&mut EvalContext, ASTNode, Option<&str>, Position) -> RhaiResultOf<DebuggerCommand>
-        + 'static,
->;
+pub type OnDebuggerCallback =
+    dyn Fn(&mut EvalContext, ASTNode, Option<&str>, Position) -> RhaiResultOf<DebuggerCommand>;
 /// A standard callback function for debugging.
 #[cfg(feature = "sync")]
-pub type OnDebuggerCallback = Box<
-    dyn Fn(&mut EvalContext, ASTNode, Option<&str>, Position) -> RhaiResultOf<DebuggerCommand>
-        + Send
-        + Sync
-        + 'static,
->;
+pub type OnDebuggerCallback = dyn Fn(&mut EvalContext, ASTNode, Option<&str>, Position) -> RhaiResultOf<DebuggerCommand>
+    + Send
+    + Sync;
 
 /// A command for the debugger on the next iteration.
 #[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]

src/eval/global_state.rs

@@ -178,7 +178,7 @@ impl GlobalRuntimeState<'_> {
     /// [modules][Module].
     #[inline]
     #[must_use]
-    pub fn get_iter(&self, id: TypeId) -> Option<IteratorFn> {
+    pub fn get_iter(&self, id: TypeId) -> Option<&IteratorFn> {
         self.modules
             .iter()
             .rev()

src/func/callable_function.rs

@@ -17,7 +17,7 @@ pub enum CallableFunction {
     /// and the rest passed by value.
     Method(Shared<FnAny>),
     /// An iterator function.
-    Iterator(IteratorFn),
+    Iterator(Shared<IteratorFn>),
     /// A plugin function,
     Plugin(Shared<FnPlugin>),
     /// A script-defined function.
@@ -177,9 +177,9 @@ impl CallableFunction {
     /// Get a reference to an iterator function.
     #[inline]
     #[must_use]
-    pub fn get_iter_fn(&self) -> Option<IteratorFn> {
+    pub fn get_iter_fn(&self) -> Option<&IteratorFn> {
         match self {
-            Self::Iterator(f) => Some(*f),
+            Self::Iterator(f) => Some(f.as_ref()),
             Self::Pure(_) | Self::Method(_) | Self::Plugin(_) => None,
 
             #[cfg(not(feature = "no_function"))]
@@ -218,13 +218,6 @@ impl CallableFunction {
     }
 }
 
-impl From<IteratorFn> for CallableFunction {
-    #[inline(always)]
-    fn from(func: IteratorFn) -> Self {
-        Self::Iterator(func)
-    }
-}
-
 #[cfg(not(feature = "no_function"))]
 impl From<crate::ast::ScriptFnDef> for CallableFunction {
     #[inline(always)]

src/func/native.rs

@@ -376,7 +376,11 @@ pub type FnAny = dyn Fn(NativeCallContext, &mut FnCallArgs) -> RhaiResult + Send
 pub type FnBuiltin = fn(NativeCallContext, &mut FnCallArgs) -> RhaiResult;
 
 /// A standard function that gets an iterator from a type.
-pub type IteratorFn = fn(Dynamic) -> Box<dyn Iterator<Item = Dynamic>>;
+#[cfg(not(feature = "sync"))]
+pub type IteratorFn = dyn Fn(Dynamic) -> Box<dyn Iterator<Item = Dynamic>>;
+/// A standard function that gets an iterator from a type.
+#[cfg(feature = "sync")]
+pub type IteratorFn = dyn Fn(Dynamic) -> Box<dyn Iterator<Item = Dynamic>> + Send + Sync;
 
 #[cfg(not(feature = "sync"))]
 pub type FnPlugin = dyn PluginFunction;
@@ -386,39 +390,37 @@ pub type FnPlugin = dyn PluginFunction + Send + Sync;
 /// A standard callback function for progress reporting.
 #[cfg(not(feature = "unchecked"))]
 #[cfg(not(feature = "sync"))]
-pub type OnProgressCallback = Box<dyn Fn(u64) -> Option<Dynamic> + 'static>;
+pub type OnProgressCallback = dyn Fn(u64) -> Option<Dynamic>;
 /// A standard callback function for progress reporting.
 #[cfg(not(feature = "unchecked"))]
 #[cfg(feature = "sync")]
-pub type OnProgressCallback = Box<dyn Fn(u64) -> Option<Dynamic> + Send + Sync + 'static>;
+pub type OnProgressCallback = dyn Fn(u64) -> Option<Dynamic> + Send + Sync;
 
 /// A standard callback function for printing.
 #[cfg(not(feature = "sync"))]
-pub type OnPrintCallback = Box<dyn Fn(&str) + 'static>;
+pub type OnPrintCallback = dyn Fn(&str);
 /// A standard callback function for printing.
 #[cfg(feature = "sync")]
-pub type OnPrintCallback = Box<dyn Fn(&str) + Send + Sync + 'static>;
+pub type OnPrintCallback = dyn Fn(&str) + Send + Sync;
 
 /// A standard callback function for debugging.
 #[cfg(not(feature = "sync"))]
-pub type OnDebugCallback = Box<dyn Fn(&str, Option<&str>, Position) + 'static>;
+pub type OnDebugCallback = dyn Fn(&str, Option<&str>, Position);
 /// A standard callback function for debugging.
 #[cfg(feature = "sync")]
-pub type OnDebugCallback = Box<dyn Fn(&str, Option<&str>, Position) + Send + Sync + 'static>;
+pub type OnDebugCallback = dyn Fn(&str, Option<&str>, Position) + Send + Sync;
 
 /// A standard callback function for mapping tokens during parsing.
 #[cfg(not(feature = "sync"))]
 pub type OnParseTokenCallback = dyn Fn(Token, Position, &TokenizeState) -> Token;
 /// A standard callback function for mapping tokens during parsing.
 #[cfg(feature = "sync")]
-pub type OnParseTokenCallback =
-    dyn Fn(Token, Position, &TokenizeState) -> Token + Send + Sync + 'static;
+pub type OnParseTokenCallback = dyn Fn(Token, Position, &TokenizeState) -> Token + Send + Sync;
 
 /// A standard callback function for variable access.
 #[cfg(not(feature = "sync"))]
-pub type OnVarCallback =
-    Box<dyn Fn(&str, usize, &EvalContext) -> RhaiResultOf<Option<Dynamic>> + 'static>;
+pub type OnVarCallback = dyn Fn(&str, usize, &EvalContext) -> RhaiResultOf<Option<Dynamic>>;
 /// A standard callback function for variable access.
 #[cfg(feature = "sync")]
 pub type OnVarCallback =
-    Box<dyn Fn(&str, usize, &EvalContext) -> RhaiResultOf<Option<Dynamic>> + Send + Sync + 'static>;
+    dyn Fn(&str, usize, &EvalContext) -> RhaiResultOf<Option<Dynamic>> + Send + Sync;

src/module/mod.rs

@@ -244,9 +244,9 @@ pub struct Module {
     /// including those in sub-modules.
     all_functions: BTreeMap<u64, Shared<CallableFunction>>,
     /// Iterator functions, keyed by the type producing the iterator.
-    type_iterators: BTreeMap<TypeId, IteratorFn>,
+    type_iterators: BTreeMap<TypeId, Shared<IteratorFn>>,
     /// Flattened collection of iterator functions, including those in sub-modules.
-    all_type_iterators: BTreeMap<TypeId, IteratorFn>,
+    all_type_iterators: BTreeMap<TypeId, Shared<IteratorFn>>,
     /// Is the [`Module`] indexed?
     indexed: bool,
     /// Does the [`Module`] contain indexed functions that have been exposed to the global namespace?
@@ -1432,8 +1432,8 @@ impl Module {
         other.functions.iter().for_each(|(&k, v)| {
             self.functions.entry(k).or_insert_with(|| v.clone());
         });
-        other.type_iterators.iter().for_each(|(&k, &v)| {
-            self.type_iterators.entry(k).or_insert(v);
+        other.type_iterators.iter().for_each(|(&k, v)| {
+            self.type_iterators.entry(k).or_insert(v.clone());
         });
         self.all_functions.clear();
         self.all_variables.clear();
@@ -1483,7 +1483,8 @@ impl Module {
                 .map(|(&k, v)| (k, v.clone())),
         );
 
-        self.type_iterators.extend(other.type_iterators.iter());
+        self.type_iterators
+            .extend(other.type_iterators.iter().map(|(&k, v)| (k, v.clone())));
         self.all_functions.clear();
         self.all_variables.clear();
         self.all_type_iterators.clear();
@@ -1768,7 +1769,7 @@ impl Module {
             path: &mut Vec<&'a str>,
             variables: &mut BTreeMap<u64, Dynamic>,
             functions: &mut BTreeMap<u64, Shared<CallableFunction>>,
-            type_iterators: &mut BTreeMap<TypeId, IteratorFn>,
+            type_iterators: &mut BTreeMap<TypeId, Shared<IteratorFn>>,
         ) -> bool {
             let mut contains_indexed_global_functions = false;
 
@@ -1789,7 +1790,7 @@ impl Module {
 
             // Index type iterators
             module.type_iterators.iter().for_each(|(&type_id, func)| {
-                type_iterators.insert(type_id, *func);
+                type_iterators.insert(type_id, func.clone());
                 contains_indexed_global_functions = true;
             });
 
@@ -1868,10 +1869,33 @@ impl Module {
     }
 
     /// Set a type iterator into the [`Module`].
+    #[cfg(not(feature = "sync"))]
     #[inline]
-    pub fn set_iter(&mut self, type_id: TypeId, func: IteratorFn) -> &mut Self {
+    pub fn set_iter(
+        &mut self,
+        type_id: TypeId,
+        func: impl Fn(Dynamic) -> Box<dyn Iterator<Item = Dynamic>> + 'static,
+    ) -> &mut Self {
+        let func = Shared::new(func);
         if self.indexed {
-            self.all_type_iterators.insert(type_id, func);
+            self.all_type_iterators.insert(type_id, func.clone());
+            self.contains_indexed_global_functions = true;
+        }
+        self.type_iterators.insert(type_id, func);
+        self
+    }
+
+    /// Set a type iterator into the [`Module`].
+    #[cfg(feature = "sync")]
+    #[inline]
+    pub fn set_iter(
+        &mut self,
+        type_id: TypeId,
+        func: impl Fn(Dynamic) -> Box<dyn Iterator<Item = Dynamic>> + SendSync + 'static,
+    ) -> &mut Self {
+        let func = Shared::new(func);
+        if self.indexed {
+            self.all_type_iterators.insert(type_id, func.clone());
             self.contains_indexed_global_functions = true;
         }
         self.type_iterators.insert(type_id, func);
@@ -1905,15 +1929,15 @@ impl Module {
     /// Get the specified type iterator.
     #[inline]
     #[must_use]
-    pub(crate) fn get_qualified_iter(&self, id: TypeId) -> Option<IteratorFn> {
-        self.all_type_iterators.get(&id).cloned()
+    pub(crate) fn get_qualified_iter(&self, id: TypeId) -> Option<&IteratorFn> {
+        self.all_type_iterators.get(&id).map(|f| f.as_ref())
     }
 
     /// Get the specified type iterator.
     #[inline]
     #[must_use]
-    pub(crate) fn get_iter(&self, id: TypeId) -> Option<IteratorFn> {
-        self.type_iterators.get(&id).cloned()
+    pub(crate) fn get_iter(&self, id: TypeId) -> Option<&IteratorFn> {
+        self.type_iterators.get(&id).map(|f| f.as_ref())
     }
 }