From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Fri, 26 Feb 2021 22:30:50 +0000 (+0000)
Subject: utils: Provide PosC::from_iter
X-Git-Tag: otter-0.4.0~347
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=92c3a1f0c6bbe5354d4e5eca0d6dab570482f26b;p=otter.git

utils: Provide PosC::from_iter

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

diff --git a/src/spec.rs b/src/spec.rs
index c8d0e8eb..e1f7f9a6 100644
--- a/src/spec.rs
+++ b/src/spec.rs
@@ -321,6 +321,20 @@ pub mod pos_traits {
   impl PosC<Coord> {
     pub fn promote(&self) -> PosC<f64> { self.map(|v| v as f64) }
   }
+
+  #[derive(Error,Debug,Copy,Clone,Serialize,Deserialize)]
+  pub struct PosCFromIteratorError;
+  display_as_debug!{PosCFromIteratorError}
+
+  impl<T> PosC<T> {
+    #[throws(PosCFromIteratorError)]
+    pub fn from_iter<I: Iterator<Item=T>>(i: I) -> Self { PosC(
+      i
+        .collect::<ArrayVec<_>>()
+        .into_inner()
+        .map_err(|_| PosCFromIteratorError)?
+    )}
+  }
 }
 
 //---------- Implementation ----------