system_cmds-643.30.1.tar.gz

[apple/system_cmds.git] / CPPUtil / UtilFileDescriptor.hpp

diff --git a/CPPUtil/UtilFileDescriptor.hpp b/CPPUtil/UtilFileDescriptor.hpp
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+++ b/CPPUtil/UtilFileDescriptor.hpp
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+//
+//  UtilFileDescriptor.hpp
+//  CPPUtil
+//
+//  Created by James McIlree on 4/16/13.
+//  Copyright (c) 2013 Apple. All rights reserved.
+//
+
+#ifndef CPPUtil_UtilFileDescriptor_hpp
+#define CPPUtil_UtilFileDescriptor_hpp
+
+class FileDescriptor {
+    protected:
+       int _fd;
+
+       // FD's aren't reference counted, we allow move semantics but
+       // not copy semantics. Disable the copy constructor and copy
+       // assignment.
+       FileDescriptor(const FileDescriptor& that) = delete;
+       FileDescriptor& operator=(const FileDescriptor& other) = delete;
+
+    public:
+
+       FileDescriptor() : _fd(-1)                              {}
+       FileDescriptor(int fd) : _fd(fd)                        {}
+
+       template <typename... Args>
+       FileDescriptor(Args&& ... args) :
+               _fd(open(static_cast<Args &&>(args)...))
+       {
+       }
+
+       FileDescriptor (FileDescriptor&& rhs) noexcept :
+               _fd(rhs._fd)
+       {
+               rhs._fd = -1;
+       }
+
+       ~FileDescriptor()                                       { close(); }
+
+       FileDescriptor& operator=(int fd)                       { close(); _fd = fd; return *this; }
+       FileDescriptor& operator=(FileDescriptor&& rhs)         { std::swap(_fd, rhs._fd); return *this; }
+
+       bool is_open() const                                    { return _fd > -1 ? true : false; }
+       void close()                                            { if (is_open()) { ::close(_fd); _fd = -1; } }
+
+       explicit operator bool() const                          { return is_open(); }
+       operator int() const                                    { return _fd; }
+};
+
+
+#endif