1 files changed, 50 insertions, 0 deletions
diff --git a/test/std/utilities/template.bitset/bitset.members/to_ullong.pass.cpp b/test/std/utilities/template.bitset/bitset.members/to_ullong.pass.cpp
new file mode 100644
index 0000000000000..27d8480d10cfe
--- /dev/null
+++ b/test/std/utilities/template.bitset/bitset.members/to_ullong.pass.cpp
@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// test unsigned long long to_ullong() const;
+
+#include <bitset>
+#include <algorithm>
+#include <climits>
+#include <cassert>
+
+template <std::size_t N>
+void test_to_ullong()
+{
+    const std::size_t M = sizeof(unsigned long long) * CHAR_BIT < N ? sizeof(unsigned long long) * CHAR_BIT : N;
+    const std::size_t X = M == 0 ? sizeof(unsigned long long) * CHAR_BIT - 1 : sizeof(unsigned long long) * CHAR_BIT - M;
+    const unsigned long long max = M == 0 ? 0 : (unsigned long long)(-1) >> X;
+    unsigned long long tests[] = {0,
+                           std::min<unsigned long long>(1, max),
+                           std::min<unsigned long long>(2, max),
+                           std::min<unsigned long long>(3, max),
+                           std::min(max, max-3),
+                           std::min(max, max-2),
+                           std::min(max, max-1),
+                           max};
+    for (std::size_t i = 0; i < sizeof(tests)/sizeof(tests[0]); ++i)
+    {
+        unsigned long long j = tests[i];
+        std::bitset<N> v(j);
+        assert(j == v.to_ullong());
+    }
+}
+
+int main()
+{
+    test_to_ullong<0>();
+    test_to_ullong<1>();
+    test_to_ullong<31>();
+    test_to_ullong<32>();
+    test_to_ullong<33>();
+    test_to_ullong<63>();
+    test_to_ullong<64>();
+    test_to_ullong<65>();
+    test_to_ullong<1000>();
+}