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util/misc/uuid.h

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 23 matching lines @@
 //! An alternate term for %UUID is “globally unique identifier” (GUID), used
 //! primarily by Microsoft.
 //!
 //! A %UUID is a unique 128-bit number specified by RFC 4122.
 //!
 //! This is a standard-layout structure.
 struct UUID {
   //! \brief Initializes the %UUID to zero.
   UUID();
 
+  //! \brief Tag to pass to constructor to indicate it should initialize with
+  //!     generated data.
+  struct InitializeWithNewTag {};
+
+  //! \brief Initializes the %UUID using a standard system facility to generate
+  //!     the value.
+  //!
+  //! CHECKs on failure with a message logged.
+  explicit UUID(InitializeWithNewTag);
+
   //! \copydoc InitializeFromBytes()
   explicit UUID(const uint8_t* bytes);
 
   bool operator==(const UUID& that) const;
   bool operator!=(const UUID& that) const { return !operator==(that); }
 
   //! \brief Initializes the %UUID from a sequence of bytes.
   //!
   //! \a bytes is taken as a %UUID laid out in big-endian format in memory. On
   //! little-endian machines, appropriate byte-swapping will be performed to
   //! initialize an object’s data members.
   //!
   //! \param[in] bytes A buffer of exactly 16 bytes that will be assigned to the
   //!     %UUID.
   void InitializeFromBytes(const uint8_t* bytes);
 
   //! \brief Initializes the %UUID from a RFC 4122 §3 formatted string.
   //!
   //! \param[in] string A string of the form
   //!     `"00112233-4455-6677-8899-aabbccddeeff"`.
   //!
   //! \return `true` if the string was formatted correctly and the object has
   //!     been initialized with the data. `false` if the string could not be
   //!     parsed, with the object state untouched.
   bool InitializeFromString(const base::StringPiece& string);
 
+  //! \brief Initializes the %UUID using a standard system facility to generate
+  //!     the value.
+  //!
+  //! \return `true` if the %UUID was initialized correctly, `false` otherwise
+  //!     with a message logged.
+  bool InitializeWithNew();
+
 #if defined(OS_WIN) || DOXYGEN
   //! \brief Initializes the %UUID from a system `UUID` or `GUID` structure.
   //!
   //! \param[in] system_uuid A system `UUID` or `GUID` structure.
   void InitializeFromSystemUUID(const ::UUID* system_uuid);
 #endif  // OS_WIN
 
   //! \brief Formats the %UUID per RFC 4122 §3.
   //!
   //! \return A string of the form `"00112233-4455-6677-8899-aabbccddeeff"`.
   std::string ToString() const;
 
 #if defined(OS_WIN) || DOXYGEN
   //! \brief The same as ToString, but returned as a string16.
   base::string16 ToString16() const;
 #endif  // OS_WIN
 
   // These fields are laid out according to RFC 4122 §4.1.2.
   uint32_t data_1;
   uint16_t data_2;
   uint16_t data_3;
   uint8_t data_4[2];
   uint8_t data_5[6];
 };
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_UTIL_MISC_UUID_H_