зеркало из https://github.com/mozilla/gecko-dev.git
142 строки
3.7 KiB
C++
142 строки
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsID_h__
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#define nsID_h__
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#include <string.h>
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#include "nscore.h"
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#define NSID_LENGTH 39
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/**
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* A "unique identifier". This is modeled after OSF DCE UUIDs.
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*/
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struct nsID {
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/**
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* @name Identifier values
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*/
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//@{
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uint32_t m0;
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uint16_t m1;
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uint16_t m2;
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uint8_t m3[8];
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//@}
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/**
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* @name Methods
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*/
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//@{
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/**
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* Equivalency method. Compares this nsID with another.
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* @return <b>true</b> if they are the same, <b>false</b> if not.
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*/
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inline bool Equals(const nsID& other) const {
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// Unfortunately memcmp isn't faster than this.
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return
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((((uint32_t*) &m0)[0] == ((uint32_t*) &other.m0)[0]) &&
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(((uint32_t*) &m0)[1] == ((uint32_t*) &other.m0)[1]) &&
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(((uint32_t*) &m0)[2] == ((uint32_t*) &other.m0)[2]) &&
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(((uint32_t*) &m0)[3] == ((uint32_t*) &other.m0)[3]));
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}
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/**
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* nsID Parsing method. Turns a {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
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* string into an nsID
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*/
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NS_COM_GLUE bool Parse(const char *aIDStr);
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#ifndef XPCOM_GLUE_AVOID_NSPR
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/**
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* nsID string encoder. Returns an allocated string in
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* {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} format. Caller should free string.
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* YOU SHOULD ONLY USE THIS IF YOU CANNOT USE ToProvidedString() BELOW.
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*/
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NS_COM_GLUE char* ToString() const;
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/**
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* nsID string encoder. Builds a string in
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* {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} format, into a char[NSID_LENGTH]
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* buffer provided by the caller (for instance, on the stack).
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*/
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NS_COM_GLUE void ToProvidedString(char (&dest)[NSID_LENGTH]) const;
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#endif // XPCOM_GLUE_AVOID_NSPR
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//@}
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};
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/*
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* Class IDs
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*/
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typedef nsID nsCID;
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// Define an CID
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#define NS_DEFINE_CID(_name, _cidspec) \
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const nsCID _name = _cidspec
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#define NS_DEFINE_NAMED_CID(_name) \
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static nsCID k##_name = _name
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#define REFNSCID const nsCID&
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/**
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* An "interface id" which can be used to uniquely identify a given
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* interface.
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*/
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typedef nsID nsIID;
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/**
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* A macro shorthand for <tt>const nsIID&<tt>
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*/
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#define REFNSIID const nsIID&
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/**
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* Define an IID
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* obsolete - do not use this macro
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*/
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#define NS_DEFINE_IID(_name, _iidspec) \
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const nsIID _name = _iidspec
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/**
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* A macro to build the static const IID accessor method. The Dummy
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* template parameter only exists so that the kIID symbol will be linked
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* properly (weak symbol on linux, gnu_linkonce on mac, multiple-definitions
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* merged on windows). Dummy should always be instantiated as "void".
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*/
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#define NS_DECLARE_STATIC_IID_ACCESSOR(the_iid) \
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template<typename T, typename U> \
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struct COMTypeInfo;
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#define NS_DEFINE_STATIC_IID_ACCESSOR(the_interface, the_iid) \
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template <typename T> \
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struct the_interface::COMTypeInfo<the_interface, T> { \
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static const nsIID kIID NS_HIDDEN; \
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}; \
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template <typename T> \
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const nsIID the_interface::COMTypeInfo<the_interface, T>::kIID NS_HIDDEN = the_iid;
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/**
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* A macro to build the static const CID accessor method
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*/
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#define NS_DEFINE_STATIC_CID_ACCESSOR(the_cid) \
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static const nsID& GetCID() {static const nsID cid = the_cid; return cid;}
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#define NS_GET_IID(T) (T::COMTypeInfo<T, void>::kIID)
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#define NS_GET_TEMPLATE_IID(T) (T::template COMTypeInfo<T, void>::kIID)
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#endif
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