gecko/xpcom/glue/nsID.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2012-05-21 04:12:37 -07:00
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsID_h__
#define nsID_h__
#include <string.h>
#ifndef nscore_h___
#include "nscore.h"
#endif
#define NSID_LENGTH 39
/**
* A "unique identifier". This is modeled after OSF DCE UUIDs.
*/
struct nsID {
/**
* @name Identifier values
*/
//@{
uint32_t m0;
uint16_t m1;
uint16_t m2;
uint8_t m3[8];
//@}
/**
* @name Methods
*/
//@{
/**
* Equivalency method. Compares this nsID with another.
* @return <b>true</b> if they are the same, <b>false</b> if not.
*/
inline bool Equals(const nsID& other) const {
// Unfortunately memcmp isn't faster than this.
return
((((uint32_t*) &m0)[0] == ((uint32_t*) &other.m0)[0]) &&
(((uint32_t*) &m0)[1] == ((uint32_t*) &other.m0)[1]) &&
(((uint32_t*) &m0)[2] == ((uint32_t*) &other.m0)[2]) &&
(((uint32_t*) &m0)[3] == ((uint32_t*) &other.m0)[3]));
}
/**
* nsID Parsing method. Turns a {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
* string into an nsID
*/
NS_COM_GLUE bool Parse(const char *aIDStr);
#ifndef XPCOM_GLUE_AVOID_NSPR
/**
* nsID string encoder. Returns an allocated string in
* {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} format. Caller should free string.
* YOU SHOULD ONLY USE THIS IF YOU CANNOT USE ToProvidedString() BELOW.
*/
NS_COM_GLUE char* ToString() const;
/**
* nsID string encoder. Builds a string in
* {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx} format, into a char[NSID_LENGTH]
* buffer provided by the caller (for instance, on the stack).
*/
NS_COM_GLUE void ToProvidedString(char (&dest)[NSID_LENGTH]) const;
#endif // XPCOM_GLUE_AVOID_NSPR
//@}
};
/*
* Class IDs
*/
typedef nsID nsCID;
// Define an CID
#define NS_DEFINE_CID(_name, _cidspec) \
const nsCID _name = _cidspec
#define NS_DEFINE_NAMED_CID(_name) \
static nsCID k##_name = _name
#define REFNSCID const nsCID&
/**
* An "interface id" which can be used to uniquely identify a given
* interface.
*/
typedef nsID nsIID;
/**
* A macro shorthand for <tt>const nsIID&<tt>
*/
#define REFNSIID const nsIID&
/**
* Define an IID
* obsolete - do not use this macro
*/
#define NS_DEFINE_IID(_name, _iidspec) \
const nsIID _name = _iidspec
/**
* A macro to build the static const IID accessor method. The Dummy
* template parameter only exists so that the kIID symbol will be linked
* properly (weak symbol on linux, gnu_linkonce on mac, multiple-definitions
* merged on windows). Dummy should always be instantiated as "int".
*/
#define NS_DECLARE_STATIC_IID_ACCESSOR(the_iid) \
template <class Dummy> \
struct COMTypeInfo \
{ \
static const nsIID kIID NS_HIDDEN; \
}; \
static const nsIID& GetIID() {return COMTypeInfo<int>::kIID;}
#define NS_DEFINE_STATIC_IID_ACCESSOR(the_interface, the_iid) \
template <class Dummy> \
const nsIID the_interface::COMTypeInfo<Dummy>::kIID NS_HIDDEN = the_iid;
/**
* A macro to build the static const CID accessor method
*/
#define NS_DEFINE_STATIC_CID_ACCESSOR(the_cid) \
static const nsID& GetCID() {static const nsID cid = the_cid; return cid;}
#define NS_GET_IID(T) (::T::COMTypeInfo<int>::kIID)
#define NS_GET_TEMPLATE_IID(T) (T::template COMTypeInfo<int>::kIID)
#endif