[rust] Triangle

1 files changed, 27 insertions, 0 deletions

diff --git a/rust/triangle/src/lib.rs b/rust/triangle/src/lib.rs
new file mode 100644
index 0000000..f4486fe
--- /dev/null
+++ b/rust/triangle/src/lib.rs
@@ -0,0 +1,27 @@
+use std::ops::Add;
+
+pub struct Triangle<T>([T; 3]);
+
+impl<T> Triangle<T>
+where
+    T: Add<Output = T> + PartialOrd + Copy,
+{
+    pub fn build(sides: [T; 3]) -> Option<Triangle<T>> {
+        Some(Triangle(sides))
+            .filter(|_| sides[0] + sides[1] > sides[2])
+            .filter(|_| sides[1] + sides[2] > sides[0])
+            .filter(|_| sides[0] + sides[2] > sides[1])
+    }
+
+    pub fn is_equilateral(&self) -> bool {
+        self.0[0] == self.0[1] && self.0[1] == self.0[2]
+    }
+
+    pub fn is_scalene(&self) -> bool {
+        self.0[0] != self.0[1] && self.0[1] != self.0[2] && self.0[0] != self.0[2]
+    }
+
+    pub fn is_isosceles(&self) -> bool {
+        !(self.is_equilateral() || self.is_scalene())
+    }
+}