libcxx initial import

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103490 91177308-0d34-0410-b5e6-96231b3b80d8

test/utilities/function.objects/unord.hash/floating.pass.cpp

@@ -0,0 +1,68 @@
+//===----------------------------------------------------------------------===//
+//
+// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <functional>
+
+// template <class T>
+// struct hash
+//     : public unary_function<T, size_t>
+// {
+//     size_t operator()(T val) const;
+// };
+
+// Not very portable
+
+#include <functional>
+#include <cassert>
+#include <type_traits>
+#include <limits>
+#include <cmath>
+
+template <class T>
+void
+test()
+{
+    static_assert((std::is_base_of<std::unary_function<T, std::size_t>,
+                                   std::hash<T> >::value), "");
+    std::hash<T> h;
+    std::size_t t0 = h(0.);
+    std::size_t tn0 = h(-0.);
+    std::size_t tp1 = h(0.1);
+    std::size_t t1 = h(1);
+    std::size_t tn1 = h(-1);
+    std::size_t pinf = h(INFINITY);
+    std::size_t ninf = h(-INFINITY);
+    assert(t0 == tn0);
+    assert(t0 != tp1);
+    assert(t0 != t1);
+    assert(t0 != tn1);
+    assert(t0 != pinf);
+    assert(t0 != ninf);
+
+    assert(tp1 != t1);
+    assert(tp1 != tn1);
+    assert(tp1 != pinf);
+    assert(tp1 != ninf);
+
+    assert(t1 != tn1);
+    assert(t1 != pinf);
+    assert(t1 != ninf);
+
+    assert(tn1 != pinf);
+    assert(tn1 != ninf);
+
+    assert(pinf != ninf);
+}
+
+int main()
+{
+    test<float>();
+    test<double>();
+    test<long double>();
+}