generic type issues

LivInTheLookingGlass · Sep 9, 2024 · 8a1e181 · 8a1e181
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diff --git a/docs/src/rust/lib/ranges.rst b/docs/src/rust/lib/ranges.rst
@@ -10,13 +10,14 @@ Includes
 - :external:rust:fn:`num_traits::one`
 - :external:rust:fn:`num_traits::zero`
 - :external:rust:trait:`std::cmp::PartialOrd`
+- :external:rust:trait:`std::marker::Copy`
 
 .. rust:fn:: pub fn ranges::range_entry3<I>(start: I, idx: I, step: I) -> I where I: NumAssign
 
   Returns the factorial of a given number. Note that it only accepts a ``u8`` because
   any number that requires a larger type is *guaranteed* to overflow.
 
-.. rust:fn:: pub fn ranges::range_entry4<I>(start: I, stop: I, idx: I, step: I) -> Option<I> where I: NumAssign + PartialOrd
+.. rust:fn:: pub fn ranges::range_entry4<I>(start: I, stop: I, idx: I, step: I) -> Option<I> where I: NumAssign + PartialOrd + Copy
 
   Returns the number of ways to choose r items from a set of n.
 

diff --git a/rust/src/include/ranges.rs b/rust/src/include/ranges.rs
@@ -1,4 +1,5 @@
 use std::cmp::PartialOrd;
+use std::marker::Copy;
 
 use num_traits::{one,zero,NumAssign};
 
@@ -9,7 +10,7 @@ where I: NumAssign
 }
 
 pub fn range_entry4<I>(start: I, stop: I, idx: I, step: I) -> Option<I>
-where I: NumAssign + PartialOrd
+where I: NumAssign + PartialOrd + Copy
 {
     let length = if step > zero() && start < stop {
         one::<I>() + (stop - one() - start) / step