From d9e93b33a07a15523fab1be60cffe4f46ea492ea Mon Sep 17 00:00:00 2001
From: andri lim <jangko128@gmail.com>
Date: Wed, 6 Jun 2018 22:53:02 +0700
Subject: [PATCH] add equality operator

---
 ranges/typedranges.nim | 4 ++++
 tests/ttypedranges.nim | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/ranges/typedranges.nim b/ranges/typedranges.nim
index 9794ac2..0ff8651 100644
--- a/ranges/typedranges.nim
+++ b/ranges/typedranges.nim
@@ -66,6 +66,10 @@ proc `[]`*[T](r: Range[T], idx: int): T {.inline.} =
   assert(idx < r.len)
   r.start.shift(idx)[]
 
+proc `==`*[T](a, b: Range[T]): bool =
+  if a.len != b.len: return false
+  equalMem(a.start, b.start, sizeof(T) * a.len)
+
 iterator ptrs[T](r: Range[T]): (int, ptr T) =
   var p = r.start
   var i = 0
diff --git a/tests/ttypedranges.nim b/tests/ttypedranges.nim
index b3b07b9..3a49424 100644
--- a/tests/ttypedranges.nim
+++ b/tests/ttypedranges.nim
@@ -19,3 +19,10 @@ suite "Typed ranges":
     let b = toRange(@[1, 2, 3])
     a[1 .. 3] = b
     check a.toSeq == @[0, 1, 2, 3, 0]
+
+  test "equality operator":
+    var x = toRange(@[0, 1, 2, 3, 4, 5])
+    var y = x[1 .. ^2]
+    var z = toRange(@[1, 2, 3, 4])
+    check y == z
+    check x != z