update source to Ceph Pacific 16.2.2

[ceph.git] / ceph / src / rocksdb / third-party / folly / folly / ScopeGuard.h

diff --git a/ceph/src/rocksdb/third-party/folly/folly/ScopeGuard.h b/ceph/src/rocksdb/third-party/folly/folly/ScopeGuard.h
new file mode 100644 (file)
index 0000000..7113440
--- /dev/null
+++ b/ceph/src/rocksdb/third-party/folly/folly/ScopeGuard.h
@@ -0,0 +1,54 @@
+//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under both the GPLv2 (found in the
+//  COPYING file in the root directory) and Apache 2.0 License
+//  (found in the LICENSE.Apache file in the root directory).
+
+#pragma once
+
+#include <folly/Traits.h>
+
+#include <utility>
+#include <type_traits>
+
+namespace folly {
+namespace scope_guard_detail {
+template <typename F>
+class ScopeGuardImpl {
+ public:
+  explicit ScopeGuardImpl(F&& f) : f_{std::forward<F>(f)} {}
+  ~ScopeGuardImpl() {
+    f_();
+  }
+
+ private:
+  F f_;
+};
+
+enum class ScopeGuardEnum {};
+template <typename Func, typename DecayedFunc = _t<std::decay<Func>>>
+ScopeGuardImpl<DecayedFunc> operator+(ScopeGuardEnum, Func&& func) {
+  return ScopeGuardImpl<DecayedFunc>{std::forward<Func>(func)};
+}
+} // namespace scope_guard_detail
+} // namespace folly
+
+/**
+ * FB_ANONYMOUS_VARIABLE(str) introduces an identifier starting with
+ * str and ending with a number that varies with the line.
+ */
+#ifndef FB_ANONYMOUS_VARIABLE
+#define FB_CONCATENATE_IMPL(s1, s2) s1##s2
+#define FB_CONCATENATE(s1, s2) FB_CONCATENATE_IMPL(s1, s2)
+#ifdef __COUNTER__
+#define FB_ANONYMOUS_VARIABLE(str) \
+  FB_CONCATENATE(FB_CONCATENATE(FB_CONCATENATE(str, __COUNTER__), _), __LINE__)
+#else
+#define FB_ANONYMOUS_VARIABLE(str) FB_CONCATENATE(str, __LINE__)
+#endif
+#endif
+
+#ifndef SCOPE_EXIT
+#define SCOPE_EXIT                                    \
+    auto FB_ANONYMOUS_VARIABLE(SCOPE_EXIT_STATE) =    \
+        ::folly::scope_guard_detail::ScopeGuardEnum{} + [&]() noexcept
+#endif