76 lines
1.8 KiB
C++
76 lines
1.8 KiB
C++
// Copyright 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_MAC_SCOPED_CFFILEDESCRIPTORREF_H_
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#define BASE_MAC_SCOPED_CFFILEDESCRIPTORREF_H_
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#include <CoreFoundation/CoreFoundation.h>
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#include "base/basictypes.h"
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#include "base/compiler_specific.h"
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namespace base {
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namespace mac {
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// ScopedCFFileDescriptorRef is designed after ScopedCFTypeRef<>. On
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// destruction, it will invalidate the file descriptor.
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// ScopedCFFileDescriptorRef (unlike ScopedCFTypeRef<>) does not support RETAIN
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// semantics, copying, or assignment, as doing so would increase the chances
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// that a file descriptor is invalidated while still in use.
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class ScopedCFFileDescriptorRef {
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public:
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explicit ScopedCFFileDescriptorRef(CFFileDescriptorRef fdref = NULL)
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: fdref_(fdref) {
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}
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~ScopedCFFileDescriptorRef() {
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if (fdref_) {
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CFFileDescriptorInvalidate(fdref_);
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CFRelease(fdref_);
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}
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}
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void reset(CFFileDescriptorRef fdref = NULL) {
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if (fdref_ == fdref)
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return;
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if (fdref_) {
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CFFileDescriptorInvalidate(fdref_);
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CFRelease(fdref_);
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}
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fdref_ = fdref;
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}
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bool operator==(CFFileDescriptorRef that) const {
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return fdref_ == that;
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}
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bool operator!=(CFFileDescriptorRef that) const {
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return fdref_ != that;
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}
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operator CFFileDescriptorRef() const {
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return fdref_;
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}
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CFFileDescriptorRef get() const {
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return fdref_;
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}
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CFFileDescriptorRef release() WARN_UNUSED_RESULT {
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CFFileDescriptorRef temp = fdref_;
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fdref_ = NULL;
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return temp;
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}
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private:
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CFFileDescriptorRef fdref_;
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DISALLOW_COPY_AND_ASSIGN(ScopedCFFileDescriptorRef);
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};
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} // namespace mac
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} // namespace base
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#endif // BASE_MAC_SCOPED_CFFILEDESCRIPTORREF_H_
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