X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/1df5f87f1309a8daa30dabdee855f48ae40d14ab..6fe7ccc865dc7d7541b93c5bcaf6368d2c98a174:/wtf/HashTraits.h

diff --git a/wtf/HashTraits.h b/wtf/HashTraits.h
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-/*
- * Copyright (C) 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- *
- */
-
-#ifndef WTF_HashTraits_h
-#define WTF_HashTraits_h
-
-#include "HashFunctions.h"
-#include "TypeTraits.h"
-#include <utility>
-#include <limits>
-
-namespace WTF {
-
-    using std::pair;
-    using std::make_pair;
-
-    template<typename T> struct HashTraits;
-
-    template<bool isInteger, typename T> struct GenericHashTraitsBase;
-
-    template<typename T> struct GenericHashTraitsBase<false, T> {
-        static const bool emptyValueIsZero = false;
-        static const bool needsDestruction = true;
-    };
-
-    // Default integer traits disallow both 0 and -1 as keys (max value instead of -1 for unsigned).
-    template<typename T> struct GenericHashTraitsBase<true, T> {
-        static const bool emptyValueIsZero = true;
-        static const bool needsDestruction = false;
-        static void constructDeletedValue(T& slot) { slot = static_cast<T>(-1); }
-        static bool isDeletedValue(T value) { return value == static_cast<T>(-1); }
-    };
-
-    template<typename T> struct GenericHashTraits : GenericHashTraitsBase<IsInteger<T>::value, T> {
-        typedef T TraitType;
-        static T emptyValue() { return T(); }
-    };
-
-    template<typename T> struct HashTraits : GenericHashTraits<T> { };
-
-    template<typename T> struct FloatHashTraits : GenericHashTraits<T> {
-        static const bool needsDestruction = false;
-        static T emptyValue() { return std::numeric_limits<T>::infinity(); }
-        static void constructDeletedValue(T& slot) { slot = -std::numeric_limits<T>::infinity(); }
-        static bool isDeletedValue(T value) { return value == -std::numeric_limits<T>::infinity(); }
-    };
-
-    template<> struct HashTraits<float> : FloatHashTraits<float> { };
-    template<> struct HashTraits<double> : FloatHashTraits<double> { };
-
-    // Default unsigned traits disallow both 0 and max as keys -- use these traits to allow zero and disallow max - 1.
-    template<typename T> struct UnsignedWithZeroKeyHashTraits : GenericHashTraits<T> {
-        static const bool emptyValueIsZero = false;
-        static const bool needsDestruction = false;
-        static T emptyValue() { return std::numeric_limits<T>::max(); }
-        static void constructDeletedValue(T& slot) { slot = std::numeric_limits<T>::max() - 1; }
-        static bool isDeletedValue(T value) { return value == std::numeric_limits<T>::max() - 1; }
-    };
-
-    template<typename P> struct HashTraits<P*> : GenericHashTraits<P*> {
-        static const bool emptyValueIsZero = true;
-        static const bool needsDestruction = false;
-        static void constructDeletedValue(P*& slot) { slot = reinterpret_cast<P*>(-1); }
-        static bool isDeletedValue(P* value) { return value == reinterpret_cast<P*>(-1); }
-    };
-
-    template<typename T> struct SimpleClassHashTraits : GenericHashTraits<T> {
-        static const bool emptyValueIsZero = true;
-        static void constructDeletedValue(T& slot) { new (&slot) T(HashTableDeletedValue); }
-        static bool isDeletedValue(const T& value) { return value.isHashTableDeletedValue(); }
-    };
-
-    template<typename P> struct HashTraits<RefPtr<P> > : SimpleClassHashTraits<RefPtr<P> > { };
-
-    // special traits for pairs, helpful for their use in HashMap implementation
-
-    template<typename FirstTraitsArg, typename SecondTraitsArg>
-    struct PairHashTraits : GenericHashTraits<pair<typename FirstTraitsArg::TraitType, typename SecondTraitsArg::TraitType> > {
-        typedef FirstTraitsArg FirstTraits;
-        typedef SecondTraitsArg SecondTraits;
-        typedef pair<typename FirstTraits::TraitType, typename SecondTraits::TraitType> TraitType;
-
-        static const bool emptyValueIsZero = FirstTraits::emptyValueIsZero && SecondTraits::emptyValueIsZero;
-        static TraitType emptyValue() { return make_pair(FirstTraits::emptyValue(), SecondTraits::emptyValue()); }
-
-        static const bool needsDestruction = FirstTraits::needsDestruction || SecondTraits::needsDestruction;
-
-        static void constructDeletedValue(TraitType& slot) { FirstTraits::constructDeletedValue(slot.first); }
-        static bool isDeletedValue(const TraitType& value) { return FirstTraits::isDeletedValue(value.first); }
-    };
-
-    template<typename First, typename Second>
-    struct HashTraits<pair<First, Second> > : public PairHashTraits<HashTraits<First>, HashTraits<Second> > { };
-
-} // namespace WTF
-
-using WTF::HashTraits;
-using WTF::PairHashTraits;
-
-#endif // WTF_HashTraits_h