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e575ee4462
There was a small mishmash of argument order, as seen on the table:
| Traits<T>::equals(U, T) | Traits<T>::equals(T, U)
============= | ======================= | =======================
uses equals() | HashMap | Vector, HashTable
defines equals() | *String[^1] | ByteBuffer
[^1]: String, DeprecatedString, their Fly-type equivalents and KString.
This mostly meant that you couldn't use a StringView for finding a value
in Vector<String>.
I'm changing the order of arguments to make the trait type itself first
(`Traits<T>::equals(T, U)`), as I think it's more expected and makes us
more consistent with the rest of the functions that put the stored type
first (like StringUtils functions and binary_serach). I've also renamed
the variable name "other" in find functions to "entry" to give more
importance to the value.
With this change, each of the following lines will now compile
successfully:
Vector<String>().contains_slow("WHF!"sv);
HashTable<String>().contains("WHF!"sv);
HashMap<ByteBuffer, int>().contains("WHF!"sv.bytes());
85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
/*
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* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/BitCast.h>
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#include <AK/Concepts.h>
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#include <AK/Forward.h>
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#include <AK/HashFunctions.h>
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#include <AK/StringHash.h>
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namespace AK {
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template<typename T>
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struct GenericTraits {
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using PeekType = T&;
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using ConstPeekType = T const&;
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static constexpr bool is_trivial() { return false; }
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static constexpr bool is_trivially_serializable() { return false; }
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static constexpr bool equals(T const& a, T const& b) { return a == b; }
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template<Concepts::HashCompatible<T> U>
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static bool equals(T const& self, U const& other) { return self == other; }
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};
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template<typename T>
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struct Traits : public GenericTraits<T> {
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};
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template<Integral T>
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struct Traits<T> : public GenericTraits<T> {
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static constexpr bool is_trivial() { return true; }
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static constexpr bool is_trivially_serializable() { return true; }
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static constexpr unsigned hash(T value)
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{
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if constexpr (sizeof(T) < 8)
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return int_hash(value);
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else
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return u64_hash(value);
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}
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};
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#ifndef KERNEL
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template<FloatingPoint T>
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struct Traits<T> : public GenericTraits<T> {
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static constexpr bool is_trivial() { return true; }
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static constexpr bool is_trivially_serializable() { return true; }
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static constexpr unsigned hash(T value)
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{
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if constexpr (sizeof(T) < 8)
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return int_hash(bit_cast<u32>(value));
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else
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return u64_hash(bit_cast<u64>(value));
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}
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};
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#endif
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template<typename T>
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requires(IsPointer<T> && !Detail::IsPointerOfType<char, T>) struct Traits<T> : public GenericTraits<T> {
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static unsigned hash(T p) { return ptr_hash(p); }
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static constexpr bool is_trivial() { return true; }
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};
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template<Enum T>
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struct Traits<T> : public GenericTraits<T> {
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static unsigned hash(T value) { return Traits<UnderlyingType<T>>::hash(to_underlying(value)); }
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static constexpr bool is_trivial() { return Traits<UnderlyingType<T>>::is_trivial(); }
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static constexpr bool is_trivially_serializable() { return Traits<UnderlyingType<T>>::is_trivially_serializable(); }
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};
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template<typename T>
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requires(Detail::IsPointerOfType<char, T>) struct Traits<T> : public GenericTraits<T> {
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static unsigned hash(T const value) { return string_hash(value, strlen(value)); }
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static constexpr bool equals(T const a, T const b) { return strcmp(a, b); }
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static constexpr bool is_trivial() { return true; }
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};
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}
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#if USING_AK_GLOBALLY
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using AK::GenericTraits;
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using AK::Traits;
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#endif
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