[pkg-d-commits] [ldc] 10/149: SCOPE_EXIT

[Matthias Klumpp]

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mak pushed a commit to annotated tag v1.2.0
in repository ldc.

commit e0685f8485f761e38c9c2f4a88675cd46c7cb3fb
Author: Ivan <ivan.butygin at gmail.com>
Date:   Sat Dec 10 19:49:50 2016 +0300

    SCOPE_EXIT
---
 gen/helpers.h | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)

diff --git a/gen/helpers.h b/gen/helpers.h
new file mode 100644
index 0000000..bae624a
--- /dev/null
+++ b/gen/helpers.h
@@ -0,0 +1,84 @@
+//===-- gen/helpers.h - General helpers -------------------------*- C++ -*-===//
+//
+//                         LDC - the LLVM D compiler
+//
+// This file is distributed under the BSD-style LDC license. See the LICENSE
+// file for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// General helper constructs.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef HELPERS_H
+#define HELPERS_H
+
+#include <utility>
+#include <type_traits>
+
+namespace details {
+
+struct Ownership {
+  bool flag = false;
+
+  Ownership() = default;
+  Ownership(bool f): flag(f) {}
+
+  Ownership(const Ownership&) = delete;
+  Ownership& operator=(const Ownership&) = delete;
+
+  Ownership(Ownership&& rhs):
+    flag(rhs.flag) {
+    rhs.flag = false;
+  }
+
+  Ownership& operator=(Ownership&& rhs) {
+    flag = rhs.flag;
+    rhs.flag = false;
+    return *this;
+  }
+
+  operator bool() const {
+    return flag;
+  }
+};
+
+template<typename Func>
+struct ScopeExit {
+  Func func;
+  Ownership active = false;
+
+  ScopeExit(Func&& f):
+    func(std::move(f)),
+    active(true) {}
+
+  ~ScopeExit() {
+    if (active) {
+      func();
+    }
+  }
+
+  ScopeExit(const ScopeExit<Func>&) = delete;
+  ScopeExit<Func>& operator=(const ScopeExit<Func>&) = delete;
+
+  ScopeExit(ScopeExit<Func>&&) = default;
+  ScopeExit<Func>& operator=(ScopeExit<Func>&&) = default;
+};
+
+struct ScopeExitTag {};
+
+template<typename Func>
+inline ScopeExit<typename std::decay<Func>::type> operator<<(const ScopeExitTag&, Func&& func) {
+  return ScopeExit<typename std::decay<Func>::type>(std::forward<Func>(func));
+}
+
+}
+
+#define LDC_STRINGIZE2(a,b) a##b
+#define LDC_STRINGIZE(a,b) LDC_STRINGIZE2(a,b)
+#define LDC_UNNAME_VAR(basename) LDC_STRINGIZE(basename, __LINE__)
+
+#define SCOPE_EXIT auto LDC_UNNAME_VAR(scope_exit) = details::ScopeExitTag{} << [&]()
+
+#endif // HELPERS_H

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