From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sat, 29 Oct 2022 21:29:07 +0000 (+0100)
Subject: add Clone
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ian/git?a=commitdiff_plain;h=1a7955f01a947decaa769dfeeae622e7987642f2;p=z3-treefoil

add Clone

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---

diff --git a/src/lib.rs b/src/lib.rs
index 5cf9d5f..daca166 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -40,7 +40,9 @@ pub fn shape_abut_zero(shape: &mut Shape) {
   }
 }
 
-pub fn shape_edges(shape: &Shape) -> impl Iterator<Item=[Point; 2]> + '_ {
+pub fn shape_edges(shape: &Shape)
+                   -> impl Iterator<Item=[Point; 2]> + Clone + '_
+{
   shape
     .iter()
     .cycle()
@@ -53,7 +55,9 @@ fn flip_coord(do_flip: bool, c: Coord) -> Coord {
   if do_flip { MAX-c } else { c }
 }
 
-pub fn shape_all_flippings(shape: &Shape) -> impl Iterator<Item=Shape> + '_ {
+pub fn shape_all_flippings(shape: &Shape)
+                           -> impl Iterator<Item=Shape> + Clone + '_
+{
   iter::repeat([false,true].into_iter())
     .take(DIM)
     .multi_cartesian_product()
@@ -66,7 +70,9 @@ pub fn shape_all_flippings(shape: &Shape) -> impl Iterator<Item=Shape> + '_ {
     })
 }
 
-pub fn shape_all_rotations(shape: &Shape) -> impl Iterator<Item=Shape> + '_ {
+pub fn shape_all_rotations(shape: &Shape)
+                           -> impl Iterator<Item=Shape> + Clone + '_
+{
   Itertools::cartesian_product(
     0..DIM,
     [false,true],