After sleeping on it I've decided that all special members that can be noexcept, should be declared so. The client has the traits to detect and branch on this information, and it is often an important optimization. Give deque() a noexcept. Add test for deque default constructor and deque destructor.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@132549 91177308-0d34-0410-b5e6-96231b3b80d8

test/containers/sequences/deque/deque.cons/default_noexcept.pass.cpp

@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <deque>
+
+// deque()
+//        noexcept(is_nothrow_default_constructible<allocator_type>::value);
+
+// This tests a conforming extension
+
+#include <deque>
+#include <cassert>
+
+#include "../../../MoveOnly.h"
+#include "../../../test_allocator.h"
+
+template <class T>
+struct some_alloc
+{
+    typedef T value_type;
+    some_alloc(const some_alloc&);
+};
+
+int main()
+{
+#if __has_feature(cxx_noexcept)
+    {
+        typedef std::deque<MoveOnly> C;
+        static_assert(std::is_nothrow_default_constructible<C>::value, "");
+    }
+    {
+        typedef std::deque<MoveOnly, test_allocator<MoveOnly>> C;
+        static_assert(std::is_nothrow_default_constructible<C>::value, "");
+    }
+    {
+        typedef std::deque<MoveOnly, other_allocator<MoveOnly>> C;
+        static_assert(!std::is_nothrow_default_constructible<C>::value, "");
+    }
+    {
+        typedef std::deque<MoveOnly, some_alloc<MoveOnly>> C;
+        static_assert(!std::is_nothrow_default_constructible<C>::value, "");
+    }
+#endif
+}

test/containers/sequences/deque/deque.cons/dtor_noexcept.pass.cpp

@@ -0,0 +1,48 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <deque>
+
+// ~deque() // implied noexcept;
+
+#include <deque>
+#include <cassert>
+
+#include "../../../MoveOnly.h"
+#include "../../../test_allocator.h"
+
+template <class T>
+struct some_alloc
+{
+    typedef T value_type;
+    some_alloc(const some_alloc&);
+    ~some_alloc() noexcept(false);
+};
+
+int main()
+{
+#if __has_feature(cxx_noexcept)
+    {
+        typedef std::deque<MoveOnly> C;
+        static_assert(std::is_nothrow_destructible<C>::value, "");
+    }
+    {
+        typedef std::deque<MoveOnly, test_allocator<MoveOnly>> C;
+        static_assert(std::is_nothrow_destructible<C>::value, "");
+    }
+    {
+        typedef std::deque<MoveOnly, other_allocator<MoveOnly>> C;
+        static_assert(std::is_nothrow_destructible<C>::value, "");
+    }
+    {
+        typedef std::deque<MoveOnly, some_alloc<MoveOnly>> C;
+        static_assert(!std::is_nothrow_destructible<C>::value, "");
+    }
+#endif
+}