More of P0600; marking allocation routines as [[nodiscard]]

llvm-svn: 318992

2 files changed, 79 insertions, 0 deletions

diff --git a/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.fail.cpp b/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.fail.cpp
new file mode 100644
index 00000000000..71201f0ef0d
--- /dev/null
+++ b/libcxx/test/std/utilities/memory/allocator.traits/allocator.traits.members/allocate.fail.cpp
@@ -0,0 +1,51 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <memory>
+
+// template <class Alloc>
+// struct allocator_traits
+// {
+//     static pointer allocate(allocator_type& a, size_type n);
+//     ...
+// };
+
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+// UNSUPPORTED: clang-3.3, clang-3.4, clang-3.5, clang-3.6, clang-3.7, clang-3.8
+
+#include <memory>
+#include <cstdint>
+#include <cassert>
+
+#include "test_macros.h"
+
+template <class T>
+struct A
+{
+    typedef T value_type;
+
+    value_type* allocate(std::size_t n)
+    {
+        assert(n == 12);
+        return reinterpret_cast<value_type*>(static_cast<std::uintptr_t>(0xEEADBEEF));
+    }
+    value_type* allocate(std::size_t n, const void* p)
+    {
+        assert(n == 11);
+        assert(p == 0);
+        return reinterpret_cast<value_type*>(static_cast<std::uintptr_t>(0xFEADBEEF));
+    }
+};
+
+int main()
+{
+    A<int> a;
+    std::allocator_traits<A<int> >::allocate(a, 10);          // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+    std::allocator_traits<A<int> >::allocate(a, 10, nullptr); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+}
diff --git a/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.fail.cpp b/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.fail.cpp
new file mode 100644
index 00000000000..490309eddd6
--- /dev/null
+++ b/libcxx/test/std/utilities/memory/default.allocator/allocator.members/allocate.fail.cpp
@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <memory>
+
+// allocator:
+// pointer allocate(size_type n, allocator<void>::const_pointer hint=0);
+
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+// UNSUPPORTED: clang-3.3, clang-3.4, clang-3.5, clang-3.6, clang-3.7, clang-3.8
+
+#include <memory>
+#include <cassert>
+
+#include "test_macros.h"
+
+int main()
+{
+    std::allocator<int> a;
+    a.allocate(3);          // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+    a.allocate(3, nullptr); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+}