/usr/include/KF5/wtf/HashTraits.h is in libkf5kjs-dev 5.28.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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 <wtf/Assertions.h>
#include <wtf/HashFunctions.h>
#include <utility>
#include <limits>
namespace WTF
{
using std::pair;
using std::make_pair;
template<typename T> struct IsInteger {
static const bool value = false;
};
template<> struct IsInteger<bool> {
static const bool value = true;
};
template<> struct IsInteger<char> {
static const bool value = true;
};
template<> struct IsInteger<signed char> {
static const bool value = true;
};
template<> struct IsInteger<unsigned char> {
static const bool value = true;
};
template<> struct IsInteger<short> {
static const bool value = true;
};
template<> struct IsInteger<unsigned short> {
static const bool value = true;
};
template<> struct IsInteger<int> {
static const bool value = true;
};
template<> struct IsInteger<unsigned int> {
static const bool value = true;
};
template<> struct IsInteger<long> {
static const bool value = true;
};
template<> struct IsInteger<unsigned long> {
static const bool value = true;
};
template<> struct IsInteger<long long> {
static const bool value = true;
};
template<> struct IsInteger<unsigned long long> {
static const bool value = true;
};
#if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
template<> struct IsInteger<wchar_t> {
static const bool value = true;
};
#endif
COMPILE_ASSERT(IsInteger<bool>::value, WTF_IsInteger_bool_true)
COMPILE_ASSERT(IsInteger<char>::value, WTF_IsInteger_char_true)
COMPILE_ASSERT(IsInteger<signed char>::value, WTF_IsInteger_signed_char_true)
COMPILE_ASSERT(IsInteger<unsigned char>::value, WTF_IsInteger_unsigned_char_true)
COMPILE_ASSERT(IsInteger<short>::value, WTF_IsInteger_short_true)
COMPILE_ASSERT(IsInteger<unsigned short>::value, WTF_IsInteger_unsigned_short_true)
COMPILE_ASSERT(IsInteger<int>::value, WTF_IsInteger_int_true)
COMPILE_ASSERT(IsInteger<unsigned int>::value, WTF_IsInteger_unsigned_int_true)
COMPILE_ASSERT(IsInteger<long>::value, WTF_IsInteger_long_true)
COMPILE_ASSERT(IsInteger<unsigned long>::value, WTF_IsInteger_unsigned_long_true)
COMPILE_ASSERT(IsInteger<long long>::value, WTF_IsInteger_long_long_true)
COMPILE_ASSERT(IsInteger<unsigned long long>::value, WTF_IsInteger_unsigned_long_long_true)
#if !COMPILER(MSVC) || defined(_NATIVE_WCHAR_T_DEFINED)
COMPILE_ASSERT(IsInteger<wchar_t>::value, WTF_IsInteger_wchar_t_true)
#endif
COMPILE_ASSERT(!IsInteger<char *>::value, WTF_IsInteger_char_pointer_false)
COMPILE_ASSERT(!IsInteger<const char * >::value, WTF_IsInteger_const_char_pointer_false)
COMPILE_ASSERT(!IsInteger<volatile char * >::value, WTF_IsInteger_volatile_char_pointer__false)
COMPILE_ASSERT(!IsInteger<double>::value, WTF_IsInteger_double_false)
COMPILE_ASSERT(!IsInteger<float>::value, WTF_IsInteger_float_false)
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> { };
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 P> struct HashTraits<RefPtr<P> > : GenericHashTraits<RefPtr<P> > {
static const bool emptyValueIsZero = true;
static void constructDeletedValue(RefPtr<P> *slot)
{
new(slot) RefPtr<P>(HashTableDeletedValue);
}
static bool isDeletedValue(const RefPtr<P> &value)
{
return value.isHashTableDeletedValue();
}
};
// 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
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