intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 52 insertions, 0 deletions

diff --git a/library/cpp/containers/stack_array/range_ops.h b/library/cpp/containers/stack_array/range_ops.h
new file mode 100644
index 0000000000..1d40341aa1
--- /dev/null
+++ b/library/cpp/containers/stack_array/range_ops.h
@@ -0,0 +1,52 @@
+#pragma once
+
+#include <util/generic/typetraits.h>
+
+#include <new>
+
+namespace NRangeOps {
+    template <class T, bool isTrivial>
+    struct TRangeOpsBase {
+        static inline void DestroyRange(T* b, T* e) noexcept {
+            while (e > b) {
+                (--e)->~T();
+            }
+        }
+
+        static inline void InitializeRange(T* b, T* e) {
+            T* c = b;
+
+            try {
+                for (; c < e; ++c) {
+                    new (c) T();
+                }
+            } catch (...) {
+                DestroyRange(b, c);
+
+                throw;
+            }
+        }
+    };
+
+    template <class T>
+    struct TRangeOpsBase<T, true> {
+        static inline void DestroyRange(T*, T*) noexcept {
+        }
+
+        static inline void InitializeRange(T*, T*) noexcept {
+        }
+    };
+
+    template <class T>
+    using TRangeOps = TRangeOpsBase<T, TTypeTraits<T>::IsPod>;
+
+    template <class T>
+    static inline void DestroyRange(T* b, T* e) noexcept {
+        TRangeOps<T>::DestroyRange(b, e);
+    }
+
+    template <class T>
+    static inline void InitializeRange(T* b, T* e) {
+        TRangeOps<T>::InitializeRange(b, e);
+    }
+}