1 files changed, 49 insertions, 0 deletions
diff --git a/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/shift_left.pass.cpp b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/shift_left.pass.cpp
new file mode 100644
index 000000000000..9c1f92a3e807
--- /dev/null
+++ b/test/std/numerics/numarray/template.mask.array/mask.array.comp.assign/shift_left.pass.cpp
@@ -0,0 +1,49 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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 mask_array
+
+// void operator<<=(const valarray<value_type>& v) const;
+
+#include <valarray>
+#include <cassert>
+
+int main()
+{
+    int a1[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
+    const std::size_t N1 = sizeof(a1)/sizeof(a1[0]);
+    int a2[] = {1, 2, 3, 4, 5};
+    const std::size_t N2 = sizeof(a2)/sizeof(a2[0]);
+    bool b[N1] = {true,  false, false, true,  true,  false,
+                  false, true,  false, false, false, true};
+    std::valarray<int> v1(a1, N1);
+    std::valarray<int> v2(a2, N2);
+    assert(N2 == std::count(b, b+N1, true));
+    std::valarray<bool> vb(b, N1);
+    v1[vb] <<= v2;
+    assert(v1.size() == 16);
+    assert(v1[ 0] ==  0);
+    assert(v1[ 1] ==  1);
+    assert(v1[ 2] ==  2);
+    assert(v1[ 3] == 12);
+    assert(v1[ 4] == 32);
+    assert(v1[ 5] ==  5);
+    assert(v1[ 6] ==  6);
+    assert(v1[ 7] == 112);
+    assert(v1[ 8] ==  8);
+    assert(v1[ 9] ==  9);
+    assert(v1[10] == 10);
+    assert(v1[11] == 352);
+    assert(v1[12] == 12);
+    assert(v1[13] == 13);
+    assert(v1[14] == 14);
+    assert(v1[15] == 15);
+}