1 files changed, 53 insertions, 0 deletions

diff --git a/libcxx/test/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_valarray.pass.cpp b/libcxx/test/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_valarray.pass.cpp
new file mode 100644
index 00000000000..cf8b6cd35ef
--- /dev/null
+++ b/libcxx/test/numerics/numarray/valarray.nonmembers/valarray.transcend/atan2_valarray_valarray.pass.cpp
@@ -0,0 +1,53 @@
+//===----------------------------------------------------------------------===//
+//
+// ΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚΚThe LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <valarray>
+
+// template<class T> class valarray;
+
+// template<class T>
+//   valarray<T>
+//   atan2(const valarray<T>& x, const valarray<T>& y);
+
+#include <valarray>
+#include <cassert>
+#include <sstream>
+
+bool is_about(double x, double y, int p)
+{
+    std::ostringstream o;
+    o.precision(p);
+    scientific(o);
+    o << x;
+    std::string a = o.str();
+    o.str("");
+    o << y;
+    return a == o.str();
+}
+
+int main()
+{
+    {
+        typedef double T;
+        T a1[] = {-.9, -.5, 0., .5, .75};
+        T a2[] = {-.8,  .25, 0.375, -.5, .75};
+        T a3[] = {-2.2974386674766221e+00,
+                  -1.1071487177940904e+00,
+                   0.0000000000000000e+00,
+                   2.3561944901923448e+00,
+                   7.8539816339744828e-01};
+        const unsigned N = sizeof(a1)/sizeof(a1[0]);
+        std::valarray<T> v1(a1, N);
+        std::valarray<T> v2(a2, N);
+        std::valarray<T> v3 = atan2(v1, v2);
+        assert(v3.size() == v1.size());
+        for (int i = 0; i < v3.size(); ++i)
+            assert(is_about(v3[i], a3[i], 10));
+    }
+}