Imported gcc-4.4.3

[msp430-gcc.git] / libstdc++-v3 / testsuite / 25_algorithms / random_shuffle / 1.cc

diff --git a/libstdc++-v3/testsuite/25_algorithms/random_shuffle/1.cc b/libstdc++-v3/testsuite/25_algorithms/random_shuffle/1.cc
new file mode 100644 (file)
index 0000000..cd92398
--- /dev/null
+++ b/libstdc++-v3/testsuite/25_algorithms/random_shuffle/1.cc
@@ -0,0 +1,74 @@
+// Copyright (C) 2001, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 25.2.11 random_shuffle()
+
+#include <algorithm>
+#include <testsuite_hooks.h>
+
+bool test __attribute__((unused)) = true;
+
+const int N = 200000;
+int A[N], s1[N];
+
+#if _GLIBCXX_PARALLEL
+#define TAG , __gnu_parallel::sequential_tag()
+#else
+#define TAG
+#endif
+
+void fill_ascending()
+{
+  for (int i = 0; i < N; ++i)
+    A[i] = i;
+}
+
+void
+test01()
+{
+  fill_ascending();
+#if _GLIBCXX_PARALLEL
+  for (int num_threads = 1; num_threads <= 2; ++num_threads)
+  {
+    omp_set_num_threads(num_threads);
+#endif
+    std::copy(A, A + N, s1);
+    VERIFY(std::equal(s1, s1 + N, A TAG));
+
+    std::random_shuffle(s1, s1 + N);
+    // the chance that random_shuffle leaves the order as is by coincidence
+    // is negligible, so we expect it to be permuted
+    VERIFY(!std::equal(s1, s1 + N, A TAG));
+
+    std::sort(s1, s1 + N TAG);
+    VERIFY(std::equal(s1, s1 + N, A TAG));
+#if _GLIBCXX_PARALLEL
+  }
+#endif
+}
+
+int
+main()
+{
+#if _GLIBCXX_PARALLEL
+  __gnu_parallel::_Settings gpms = __gnu_parallel::_Settings::get();
+  gpms.algorithm_strategy = __gnu_parallel::force_parallel;
+  __gnu_parallel::_Settings::set(gpms);
+#endif
+  test01();
+  return 0;
+}