1 files changed, 51 insertions, 0 deletions
diff --git a/libcxx/test/std/utilities/template.bitset/bitset.members/to_ulong.pass.cpp b/libcxx/test/std/utilities/template.bitset/bitset.members/to_ulong.pass.cpp
new file mode 100644
index 00000000000..3ad1abade9f
--- /dev/null
+++ b/libcxx/test/std/utilities/template.bitset/bitset.members/to_ulong.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.
+//
+//===----------------------------------------------------------------------===//
+
+// test unsigned long to_ulong() const;
+
+#include <bitset>
+#include <algorithm>
+#include <limits>
+#include <climits>
+#include <cassert>
+
+template <std::size_t N>
+void test_to_ulong()
+{
+    const std::size_t M = sizeof(unsigned long) * CHAR_BIT < N ? sizeof(unsigned long) * CHAR_BIT : N;
+    const std::size_t X = M == 0 ? sizeof(unsigned long) * CHAR_BIT - 1 : sizeof(unsigned long) * CHAR_BIT - M;
+    const std::size_t max = M == 0 ? 0 : std::size_t(std::numeric_limits<unsigned long>::max()) >> X;
+    std::size_t tests[] = {0,
+                           std::min<std::size_t>(1, max),
+                           std::min<std::size_t>(2, max),
+                           std::min<std::size_t>(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)
+    {
+        std::size_t j = tests[i];
+        std::bitset<N> v(j);
+        assert(j == v.to_ulong());
+    }
+}
+
+int main()
+{
+    test_to_ulong<0>();
+    test_to_ulong<1>();
+    test_to_ulong<31>();
+    test_to_ulong<32>();
+    test_to_ulong<33>();
+    test_to_ulong<63>();
+    test_to_ulong<64>();
+    test_to_ulong<65>();
+    test_to_ulong<1000>();
+}