Hi
We are missing obvious debug checks in std::copy_n. Moreover I'll
need them when I'll remove the Debug layer in a coming patch.
Tested under Linux x86_64.
* include/bits/stl_algo.h (copy_n): Add
__glibcxx_requires_can_increment
debug checks.
* testsuite/25_algorithms/copy_n/debug/1_neg.cc: New.
* testsuite/25_algorithms/copy_n/debug/2_neg.cc: New.
I'll commit this day or this week end if not told otherwise.
François
diff --git a/libstdc++-v3/include/bits/stl_algo.h b/libstdc++-v3/include/bits/stl_algo.h
index c1003077176..078efc028cc 100644
--- a/libstdc++-v3/include/bits/stl_algo.h
+++ b/libstdc++-v3/include/bits/stl_algo.h
@@ -816,6 +816,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
__glibcxx_function_requires(_InputIteratorConcept<_InputIterator>)
__glibcxx_function_requires(_OutputIteratorConcept<_OutputIterator,
typename iterator_traits<_InputIterator>::value_type>)
+ __glibcxx_requires_can_increment(__first, __n);
+ __glibcxx_requires_can_increment(__result, __n);
return std::__copy_n(__first, __n, __result,
std::__iterator_category(__first));
diff --git a/libstdc++-v3/testsuite/25_algorithms/copy_n/debug/1_neg.cc b/libstdc++-v3/testsuite/25_algorithms/copy_n/debug/1_neg.cc
new file mode 100644
index 00000000000..3e0e0299e1d
--- /dev/null
+++ b/libstdc++-v3/testsuite/25_algorithms/copy_n/debug/1_neg.cc
@@ -0,0 +1,38 @@
+// Copyright (C) 2019 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/>.
+
+// { dg-do run { target c++11 xfail *-*-* } }
+// { dg-require-debug-mode "" }
+
+#include <algorithm>
+#include <vector>
+
+void
+test01()
+{
+ std::vector<int> v1(3, 1);
+ std::vector<int> v2(5, 0);
+
+ std::copy_n(v1.begin(), 5, v2.begin());
+}
+
+int
+main()
+{
+ test01();
+ return 0;
+}
diff --git a/libstdc++-v3/testsuite/25_algorithms/copy_n/debug/2_neg.cc b/libstdc++-v3/testsuite/25_algorithms/copy_n/debug/2_neg.cc
new file mode 100644
index 00000000000..ebc7cb5ea4c
--- /dev/null
+++ b/libstdc++-v3/testsuite/25_algorithms/copy_n/debug/2_neg.cc
@@ -0,0 +1,38 @@
+// Copyright (C) 2019 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/>.
+
+// { dg-do run { target c++11 xfail *-*-* } }
+// { dg-require-debug-mode "" }
+
+#include <algorithm>
+#include <vector>
+
+void
+test01()
+{
+ std::vector<int> v1(5, 1);
+ std::vector<int> v2(3, 0);
+
+ std::copy_n(v1.begin(), 5, v2.begin());
+}
+
+int
+main()
+{
+ test01();
+ return 0;
+}
