Merge georust#339

339: Geometrycollection ergonomics r=frewsxcv a=rory just some minor ergonomic improvements Co-authored-by: Rory McCann <rory@technomancy.org> Co-authored-by: Corey Farwell <coreyf@rwell.org>
amandasaurus · Feb 17, 2019 · fc4a6ee · fc4a6ee
2 parents b8a9514 + 382c020
commit fc4a6ee
Showing 1 changed file with 21 additions and 0 deletions.
diff --git a/geo-types/src/geometry_collection.rs b/geo-types/src/geometry_collection.rs
@@ -11,12 +11,33 @@ pub struct GeometryCollection<T>(pub Vec<Geometry<T>>)
 where
     T: CoordinateType;
 
+impl<T: CoordinateType> GeometryCollection<T> {
+    /// Return an empty GeometryCollection
+    pub fn new() -> GeometryCollection<T> {
+        GeometryCollection(Vec::new())
+    }
+
+    /// Number of geometries in this GeometryCollection
+    pub fn len(&self) -> usize {
+        self.0.len()
+    }
+
+    /// Is this GeometryCollection empty
+    pub fn is_empty(&self) -> bool {
+        self.0.is_empty()
+    }
+}
+
+
+/// Convert any Geometry (or anything that can be converted to a Geometry) into a
+/// GeometryCollection
 impl<T: CoordinateType, IG: Into<Geometry<T>>> From<IG> for GeometryCollection<T> {
     fn from(x: IG) -> Self {
         GeometryCollection(vec![x.into()])
     }
 }
 
+/// Collect Geometries (or what can be converted to a Geometry) into a GeometryCollection
 impl<T: CoordinateType, IG: Into<Geometry<T>>> FromIterator<IG> for GeometryCollection<T> {
     fn from_iter<I: IntoIterator<Item = IG>>(iter: I) -> Self {
         GeometryCollection(iter.into_iter().map(|g| g.into()).collect())