Imported gcc-4.4.3

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

diff --git a/libstdc++-v3/testsuite/25_algorithms/prev_permutation/1.cc b/libstdc++-v3/testsuite/25_algorithms/prev_permutation/1.cc
new file mode 100644 (file)
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+++ b/libstdc++-v3/testsuite/25_algorithms/prev_permutation/1.cc
@@ -0,0 +1,83 @@
+// Copyright (C) 2005, 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/>.
+
+// 25.3.9 [lib.alg.permutation.generators]
+
+#include <algorithm>
+#include <testsuite_hooks.h>
+#include <testsuite_iterators.h>
+
+using __gnu_test::test_container;
+using __gnu_test::bidirectional_iterator_wrapper;
+using std::prev_permutation;
+
+typedef test_container<int, bidirectional_iterator_wrapper> Container;
+
+void
+test1()
+{
+  // Note: The standard is unclear on what should happen in this case.
+  // This seems the only really sensible behaviour, and what is done.
+  int array[] = {0};
+  Container con(array, array);
+  VERIFY(!prev_permutation(con.begin(), con.end()));
+}
+
+void
+test2()
+{
+  int array[] = {0};
+  Container con(array, array + 1);
+  VERIFY(!prev_permutation(con.begin(), con.end()));
+}
+
+void
+test3()
+{
+  int array[] = {3, 0};
+  Container con(array, array + 2);
+  VERIFY(prev_permutation(con.begin(), con.end()));
+  VERIFY(array[0] == 0 && array[1] == 3);
+  VERIFY(!prev_permutation(con.begin(), con.end()));
+  VERIFY(array[0] == 3 && array[1] == 0);
+}
+
+void
+test4()
+{
+  int array[6] = {5, 4, 3, 2, 1, 0};
+  Container con(array, array + 6);
+  for(int i = 0 ; i < 719; ++i)
+    {
+      int temp_array[6];
+      std::copy(array, array + 6, temp_array);
+      VERIFY(prev_permutation(array, array + 6));
+      VERIFY(std::lexicographical_compare(array, array + 6,
+                                         temp_array, temp_array + 6));
+    }
+  VERIFY(!prev_permutation(array,array + 6));
+  for(int i = 0; i < 6; ++i)
+    VERIFY(array[i] == 5 - i);
+}
+
+int main()
+{
+  test1();
+  test2();
+  test3();
+  test4();
+}