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108 lines
4.3 KiB
C++
108 lines
4.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef __nsHashSets_h__
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#define __nsHashSets_h__
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#include "nsDoubleHashtable.h"
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/*
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* HASH SETS
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*
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* These hash classes describe hashtables that contain keys without values.
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* This is useful when you want to store things and then just test for their
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* existence later. We have defined standard ones for string, int and void.
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*
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* nsStringHashSet: nsAString&
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* nsCStringHashSet: nsACString&
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* nsInt32HashSet: PRInt32
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* nsVoidHashSet: void*
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*
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* USAGE:
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* Put(): put a thing of the given type into the set
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* Contains(): whether it contains a thing of the given type
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* To use, you just do: (for example)
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*
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* #include "nsDoubleHashtable.h"
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* nsInt32HashSet mySet;
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* mySet.Init(1);
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* mySet.Put(5);
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* if (mySet.Contains(5)) {
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* printf("yay\n");
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* }
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*
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* There is a nice convenient macro for declaring empty map classes:
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* DECL_DHASH_SET(CLASSNAME, ENTRY_CLASS, KEY_TYPE)
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* - CLASSNAME: the name of the class
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* - ENTRY_CLASS: the name of the entry class with the key in it
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* - KEY_TYPE: the type of key for Put() and Contains()
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*
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* DHASH_SET(CLASSNAME, ENTRY_CLASS, KEY_TYPE) is the companion macro
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* you must put in the .cpp (implementation) code.
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*/
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#define DECL_DHASH_SET(CLASSNAME,ENTRY_CLASS,KEY_TYPE) \
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DECL_DHASH_WRAPPER(CLASSNAME##Super,ENTRY_CLASS,KEY_TYPE) \
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class DHASH_EXPORT CLASSNAME : public CLASSNAME##Super { \
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public: \
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CLASSNAME() : CLASSNAME##Super() { } \
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~CLASSNAME() { } \
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nsresult Put(const KEY_TYPE aKey) { \
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return AddEntry(aKey) ? NS_OK : NS_ERROR_OUT_OF_MEMORY; \
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} \
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bool Contains(const KEY_TYPE aKey) { \
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return GetEntry(aKey) ? PR_TRUE : PR_FALSE; \
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} \
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};
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#define DHASH_SET(CLASSNAME,ENTRY_CLASS,KEY_TYPE) \
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DHASH_WRAPPER(CLASSNAME##Super,ENTRY_CLASS,KEY_TYPE)
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#undef DHASH_EXPORT
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#define DHASH_EXPORT
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DECL_DHASH_SET(nsStringHashSet, PLDHashStringEntry, nsAString&)
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DECL_DHASH_SET(nsCStringHashSet,PLDHashCStringEntry,nsACString&)
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DECL_DHASH_SET(nsInt32HashSet, PLDHashInt32Entry, PRInt32)
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DECL_DHASH_SET(nsVoidHashSet, PLDHashVoidEntry, void*)
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#undef DHASH_EXPORT
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#define DHASH_EXPORT
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#endif
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