From 4a1f398fe31c03fe370245baee7888a21b119472 Mon Sep 17 00:00:00 2001
From: annieversary <annnnnie@protonmail.com>
Date: Mon, 15 Nov 2021 22:21:17 +0000
Subject: [PATCH] replace Box with Arc so lenses are clonable

---
 src/lenses/lens.rs | 11 +++++++----
 src/lenses/to.rs   | 11 +++++++----
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/src/lenses/lens.rs b/src/lenses/lens.rs
index ec8e647..a9f57f7 100644
--- a/src/lenses/lens.rs
+++ b/src/lenses/lens.rs
@@ -1,9 +1,12 @@
+use std::sync::Arc;
+
 use crate::lenses::{Lens, LensOver, LensView};
 
 type Getter<T, U> = dyn Fn(T) -> U;
 type Setter<T, U> = dyn Fn(T, U) -> T;
 
-pub struct FuncLens<T, U>(pub(crate) Box<Getter<T, U>>, pub(crate) Box<Setter<T, U>>);
+#[derive(Clone)]
+pub struct FuncLens<T, U>(pub(crate) Arc<Getter<T, U>>, pub(crate) Arc<Setter<T, U>>);
 
 impl<T, U> LensView<T> for FuncLens<T, U> {
     type Field = U;
@@ -28,8 +31,8 @@ impl<T: Clone, U> LensOver<T> for FuncLens<T, U> {
 
 /// Makes a lens that implements `LensView<T>` and `LensOver<T>` with the provided functions
 pub fn lens_from_boxed<T, U>(
-    getter: Box<Getter<T, U>>,
-    setter: Box<Setter<T, U>>,
+    getter: Arc<Getter<T, U>>,
+    setter: Arc<Setter<T, U>>,
 ) -> Lens<FuncLens<T, U>> {
     Lens(FuncLens(getter, setter))
 }
@@ -38,5 +41,5 @@ pub fn lens<T, U>(
     getter: impl Fn(T) -> U + 'static,
     setter: impl Fn(T, U) -> T + 'static,
 ) -> Lens<FuncLens<T, U>> {
-    Lens(FuncLens(Box::new(getter), Box::new(setter)))
+    Lens(FuncLens(Arc::new(getter), Arc::new(setter)))
 }
diff --git a/src/lenses/to.rs b/src/lenses/to.rs
index c6e9f24..36c1af2 100644
--- a/src/lenses/to.rs
+++ b/src/lenses/to.rs
@@ -1,8 +1,11 @@
+use std::sync::Arc;
+
 use crate::lenses::{Lens, LensView};
 
 use super::lens::FuncLens;
 
-pub struct ToInner<T, U>(Box<dyn Fn(T) -> U>);
+#[derive(Clone)]
+pub struct ToInner<T, U>(Arc<dyn Fn(T) -> U>);
 
 impl<T, U> LensView<T> for ToInner<T, U> {
     type Field = U;
@@ -13,17 +16,17 @@ impl<T, U> LensView<T> for ToInner<T, U> {
 }
 
 /// Makes a lens that implements `LensView<T>` with the provided function
-pub fn to_from_boxed<T, U>(f: Box<dyn Fn(T) -> U>) -> Lens<ToInner<T, U>> {
+pub fn to_from_boxed<T, U>(f: Arc<dyn Fn(T) -> U>) -> Lens<ToInner<T, U>> {
     Lens(ToInner(f))
 }
 /// Makes a lens that implements `LensView<T>` with the provided function
 pub fn to<T, U>(f: impl Fn(T) -> U + 'static) -> Lens<ToInner<T, U>> {
-    Lens(ToInner(Box::new(f)))
+    Lens(ToInner(Arc::new(f)))
 }
 
 impl<T, U> Lens<ToInner<T, U>> {
     /// Makes a full lens that implements `LensView<T>` and `LensOver<T>` with the provided functions
     pub fn make_lens(self, setter: impl Fn(T, U) -> T + 'static) -> Lens<FuncLens<T, U>> {
-        Lens(FuncLens((self.0).0, Box::new(setter)))
+        Lens(FuncLens((self.0).0, Arc::new(setter)))
     }
 }