alignment: Specify trait definitions within the allocator

Allows containers and other data structures to consider optimizations
based off of them. We satisfy all of these requirements anyways.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/common/alignment.h b/src/common/alignment.h
index 88d5d3a65..e24f8b0e6 100644
--- a/src/common/alignment.h
+++ b/src/common/alignment.h
@@ -51,6 +51,11 @@ public:
     using reference = T&;
     using const_reference = const T&;
 
+    using propagate_on_container_copy_assignment = std::true_type;
+    using propagate_on_container_move_assignment = std::true_type;
+    using propagate_on_container_swap = std::true_type;
+    using is_always_equal = std::true_type;
+
 public:
     pointer address(reference r) noexcept {
         return std::addressof(r);