1 files changed, 51 insertions, 0 deletions
diff --git a/libcxx/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan_valarray.pass.cpp b/libcxx/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan_valarray.pass.cpp
new file mode 100644
index 00000000000..e66118b1d6d
--- /dev/null
+++ b/libcxx/test/std/numerics/numarray/valarray.nonmembers/valarray.transcend/atan_valarray.pass.cpp
@@ -0,0 +1,51 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <valarray>
+
+// template<class T> class valarray;
+
+// template<class T>
+//   valarray<T>
+//   atan(const valarray<T>& x);
+
+#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 a3[] = {-7.3281510178650666e-01,
+                  -4.6364760900080615e-01,
+                   0.0000000000000000e+00,
+                   4.6364760900080615e-01,
+                   6.4350110879328437e-01};
+        const unsigned N = sizeof(a1)/sizeof(a1[0]);
+        std::valarray<T> v1(a1, N);
+        std::valarray<T> v3 = atan(v1);
+        assert(v3.size() == v1.size());
+        for (int i = 0; i < v3.size(); ++i)
+            assert(is_about(v3[i], a3[i], 10));
+    }
+}