From 69e2eccf687616ea3c6f1d233dc576f7a9acbbbf Mon Sep 17 00:00:00 2001
From: Tomasz Grabiec <tgrabiec@scylladb.com>
Date: Mon, 22 May 2017 10:39:33 +0200
Subject: [PATCH] allocating_strategy: Introduce alloc_strategy_unique_ptr<>

---
 utils/allocation_strategy.hh | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/utils/allocation_strategy.hh b/utils/allocation_strategy.hh
index b69073bb3d..218dd14dd3 100644
--- a/utils/allocation_strategy.hh
+++ b/utils/allocation_strategy.hh
@@ -203,6 +203,19 @@ auto current_deleter() {
     };
 }
 
+template<typename T>
+struct alloc_strategy_deleter {
+    void operator()(T* ptr) const noexcept {
+        current_allocator().destroy(ptr);
+    }
+};
+
+// std::unique_ptr which can be used for owning an object allocated using allocation_strategy.
+// Must be destroyed before the pointer is invalidated. For compacting allocators, that
+// means it must not escape outside allocating_section or reclaim lock.
+// Must be destroyed in the same allocating context in which T was allocated.
+template<typename T>
+using alloc_strategy_unique_ptr = std::unique_ptr<T, alloc_strategy_deleter<T>>;
 
 //
 // Passing allocators to objects.