add test

dlang · Jun 17, 2020 · 26deaeb · 26deaeb
1 parent a6da2af
commit 26deaeb
Showing 1 changed file with 34 additions and 0 deletions.
diff --git a/std/algorithm/setops.d b/std/algorithm/setops.d
@@ -353,6 +353,40 @@ pure nothrow @safe @nogc unittest
     foreach (t; cartesianProduct(a[], a[])) {}
 }
 
+unittest
+{
+    import std.algorithm.comparison : equal;
+    import std.typecons : tuple;
+
+    static struct SystemRange
+    {
+        int[] data;
+
+        int front() @system @property
+        {
+            return data[0];
+        }
+
+        bool empty() @system @property
+        {
+            return data.length == 0;
+        }
+
+        void popFront() @system
+        {
+            data = data[1 .. $];
+        }
+
+        SystemRange save() @system
+        {
+            return this;
+        }
+    }
+
+    assert(SystemRange([1, 2]).cartesianProduct(SystemRange([3, 4]))
+        .equal([tuple(1, 3), tuple(1, 4), tuple(2, 3), tuple(2, 4)]));
+}
+
 /// ditto
 auto cartesianProduct(RR...)(RR ranges)
 if (ranges.length >= 2 &&