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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.
57 lines
2.1 KiB
C++
57 lines
2.1 KiB
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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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/Traits.h>
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#include <AK/Types.h>
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namespace AK {
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template<typename TIterator, typename TUnaryPredicate>
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constexpr TIterator find_if(TIterator first, TIterator last, TUnaryPredicate&& pred)
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{
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for (; first != last; ++first) {
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if (pred(*first)) {
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return first;
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}
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}
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return last;
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}
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template<typename TIterator, typename T>
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constexpr TIterator find(TIterator first, TIterator last, const T& value)
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{
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return find_if(first, last, [&](const auto& v) { return Traits<T>::equals(value, v); });
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}
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template<typename TIterator, typename T>
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constexpr size_t find_index(TIterator first, TIterator last, const T& value)
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{
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return find_if(first, last, [&](const auto& v) { return Traits<T>::equals(value, v); }).index();
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}
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}
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