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4333a9a8d6
Problem: - `find` is implemented inside of each container. This coupling requires that each container needs to individually provide `find`. Solution: - Decouple the `find` functionality from the container. This allows provides a `find` algorithm which can work with all containers. Containers can still provide their own `find` in the case where it can be optimized. - This also allows for searching sub-ranges of a container rather than the entire container as some of the container-specific member functions enforced. Note: - @davidstone's talk from 2015 C++Now conference entitled "Functions Want to be Free" encourages this style: (https://www.youtube.com/watch?v=_lVlC0xzXDc), but it does come at the cost of composability. - A logical follow-on to this is to provide a mechanism to use a short-hand function which automatically searches the entire container. This could automatically use the container-provided version if available so that functions which provide their own optimized version get the benefit.
106 lines
3.4 KiB
C++
106 lines
3.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Forward.h>
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#include <AK/HashFunctions.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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static constexpr bool is_trivial() { return false; }
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static constexpr bool equals(const T& a, const T& b) { return a == b; }
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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<>
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struct Traits<int> : public GenericTraits<int> {
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static constexpr bool is_trivial() { return true; }
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static unsigned hash(int i) { return int_hash(i); }
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};
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template<>
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struct Traits<char> : public GenericTraits<char> {
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static constexpr bool is_trivial() { return true; }
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static unsigned hash(char c) { return int_hash(c); }
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};
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template<>
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struct Traits<i16> : public GenericTraits<i16> {
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static constexpr bool is_trivial() { return true; }
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static unsigned hash(i16 i) { return int_hash(i); }
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};
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template<>
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struct Traits<i64> : public GenericTraits<i64> {
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static constexpr bool is_trivial() { return true; }
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static unsigned hash(i64 i) { return u64_hash(i); }
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};
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template<>
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struct Traits<unsigned> : public GenericTraits<unsigned> {
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static constexpr bool is_trivial() { return true; }
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static unsigned hash(unsigned u) { return int_hash(u); }
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};
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template<>
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struct Traits<u8> : public GenericTraits<u8> {
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static constexpr bool is_trivial() { return true; }
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static unsigned hash(u8 u) { return int_hash(u); }
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};
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template<>
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struct Traits<u16> : public GenericTraits<u16> {
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static constexpr bool is_trivial() { return true; }
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static unsigned hash(u16 u) { return int_hash(u); }
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};
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template<>
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struct Traits<u64> : public GenericTraits<u64> {
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static constexpr bool is_trivial() { return true; }
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static unsigned hash(u64 u) { return u64_hash(u); }
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};
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template<typename T>
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struct Traits<T*> : public GenericTraits<T*> {
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static unsigned hash(const T* p)
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{
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return int_hash((unsigned)(__PTRDIFF_TYPE__)p);
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}
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static constexpr bool is_trivial() { return true; }
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static bool equals(const T* a, const T* b) { return a == b; }
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};
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}
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using AK::GenericTraits;
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using AK::Traits;
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