mirror of
https://github.com/apple/swift.git
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29d76f3b68
- Added missing ifdef guard in PointerIntEnum header - Consistent naming convention for ifdef guards - Consistent 'end namespace swift' - Consistent single EOL at end of header files
62 lines
1.6 KiB
C++
62 lines
1.6 KiB
C++
//===--- Defer.h - 'defer' helper macro -------------------------*- C++ -*-===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines a 'defer' macro for performing a cleanup on any exit out
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// of a scope.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_BASIC_DEFER_H
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#define SWIFT_BASIC_DEFER_H
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#include <type_traits>
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namespace swift {
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template <typename F>
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class DoAtScopeExit {
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F &Fn;
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void operator=(DoAtScopeExit&) = delete;
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public:
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DoAtScopeExit(F &Fn) : Fn(Fn){}
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~DoAtScopeExit() {
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Fn();
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}
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};
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namespace detail {
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struct DeferTask {};
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template<typename F>
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DoAtScopeExit<typename std::decay<F>::type> operator+(DeferTask, F&& fn) {
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return DoAtScopeExit<typename std::decay<F>::type>(fn);
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}
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}
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} // end namespace swift
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#define DEFER_CONCAT_IMPL(x, y) x##y
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#define DEFER_MACRO_CONCAT(x, y) DEFER_CONCAT_IMPL(x, y)
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#define defer_impl \
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auto DEFER_MACRO_CONCAT(defer_func, __COUNTER__) = \
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::swift::detail::DeferTask() + [&]()
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/// This macro is used to register a function / lambda to be run on exit from a
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/// scope. Its typical use looks like:
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///
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/// defer {
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/// stuff
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/// };
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///
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#define defer defer_impl
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#endif // SWIFT_BASIC_DEFER_H
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