intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 76 insertions, 0 deletions

diff --git a/contrib/libs/llvm12/include/llvm/ADT/ScopeExit.h b/contrib/libs/llvm12/include/llvm/ADT/ScopeExit.h
new file mode 100644
index 0000000000..015d32c8b6
--- /dev/null
+++ b/contrib/libs/llvm12/include/llvm/ADT/ScopeExit.h
@@ -0,0 +1,76 @@
+#pragma once
+
+#ifdef __GNUC__
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+#endif
+
+//===- llvm/ADT/ScopeExit.h - Execute code at scope exit --------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the make_scope_exit function, which executes user-defined
+// cleanup logic at scope exit.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ADT_SCOPE_EXIT_H
+#define LLVM_ADT_SCOPE_EXIT_H
+
+#include "llvm/Support/Compiler.h"
+
+#include <type_traits>
+#include <utility>
+
+namespace llvm {
+namespace detail {
+
+template <typename Callable> class scope_exit {
+  Callable ExitFunction;
+  bool Engaged = true; // False once moved-from or release()d.
+
+public:
+  template <typename Fp>
+  explicit scope_exit(Fp &&F) : ExitFunction(std::forward<Fp>(F)) {}
+
+  scope_exit(scope_exit &&Rhs)
+      : ExitFunction(std::move(Rhs.ExitFunction)), Engaged(Rhs.Engaged) {
+    Rhs.release();
+  }
+  scope_exit(const scope_exit &) = delete;
+  scope_exit &operator=(scope_exit &&) = delete;
+  scope_exit &operator=(const scope_exit &) = delete;
+
+  void release() { Engaged = false; }
+
+  ~scope_exit() {
+    if (Engaged)
+      ExitFunction();
+  }
+};
+
+} // end namespace detail
+
+// Keeps the callable object that is passed in, and execute it at the
+// destruction of the returned object (usually at the scope exit where the
+// returned object is kept).
+//
+// Interface is specified by p0052r2.
+template <typename Callable>
+LLVM_NODISCARD detail::scope_exit<typename std::decay<Callable>::type>
+make_scope_exit(Callable &&F) {
+  return detail::scope_exit<typename std::decay<Callable>::type>(
+      std::forward<Callable>(F));
+}
+
+} // end namespace llvm
+
+#endif
+
+#ifdef __GNUC__
+#pragma GCC diagnostic pop
+#endif