Move test into test/std subdirectory.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/numerics/rand/rand.eng/rand.eng.lcong/values.pass.cpp

@@ -0,0 +1,74 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template <class UIntType, UIntType a, UIntType c, UIntType m>
+// class linear_congruential_engine
+// {
+// public:
+//     engine characteristics
+//     static constexpr result_type multiplier = a;
+//     static constexpr result_type increment = c;
+//     static constexpr result_type modulus = m;
+//     static constexpr result_type min() { return c == 0u ? 1u: 0u;}
+//     static constexpr result_type max() { return m - 1u;}
+//     static constexpr result_type default_seed = 1u;
+
+#include <random>
+#include <type_traits>
+#include <cassert>
+
+template <class _Tp>
+void where(const _Tp &) {}
+
+template <class T, T a, T c, T m>
+void
+test1()
+{
+    typedef std::linear_congruential_engine<T, a, c, m> LCE;
+    typedef typename LCE::result_type result_type;
+    static_assert((LCE::multiplier == a), "");
+    static_assert((LCE::increment == c), "");
+    static_assert((LCE::modulus == m), "");
+    /*static_*/assert((LCE::min() == (c == 0u ? 1u: 0u))/*, ""*/);
+    /*static_*/assert((LCE::max() == result_type(m - 1u))/*, ""*/);
+    static_assert((LCE::default_seed == 1), "");
+    where(LCE::multiplier);
+    where(LCE::increment);
+    where(LCE::modulus);
+    where(LCE::default_seed);
+}
+
+template <class T>
+void
+test()
+{
+    test1<T, 0, 0, 0>();
+    test1<T, 0, 1, 2>();
+    test1<T, 1, 1, 2>();
+    const T M(~0);
+    test1<T, 0, 0, M>();
+    test1<T, 0, M-2, M>();
+    test1<T, 0, M-1, M>();
+    test1<T, M-2, 0, M>();
+    test1<T, M-2, M-2, M>();
+    test1<T, M-2, M-1, M>();
+    test1<T, M-1, 0, M>();
+    test1<T, M-1, M-2, M>();
+    test1<T, M-1, M-1, M>();
+}
+
+int main()
+{
+    test<unsigned short>();
+    test<unsigned int>();
+    test<unsigned long>();
+    test<unsigned long long>();
+}