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https://github.com/SerenityOS/serenity
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2cf4781d14
Problem: - Now that a generic free-function form of `find_if` is implemented the code in `all_of` is redundant. Solution: - Follow the "don't repeat yourself" mantra and make the code DRY by implementing `all_of` in terms of `find_if`. - One tricky part is that since captures are not permitted in `constexpr` lambdas, the lambda created to negate the predicate needs to be created by a function which does not capture and takes the predicate at run-time instead. This allows `all_of` to continue to work in a `constexpr` context.
36 lines
791 B
C++
36 lines
791 B
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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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/Concepts.h>
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#include <AK/Find.h>
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#include <AK/Iterator.h>
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namespace AK {
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template<typename TEndIterator, IteratorPairWith<TEndIterator> TIterator>
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constexpr bool all_of(
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TIterator const& begin,
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TEndIterator const& end,
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auto const& predicate)
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{
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constexpr auto negated_predicate = [](auto const& pred) {
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return [&](auto const& elem) { return !pred(elem); };
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};
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return !(find_if(begin, end, negated_predicate(predicate)) != end);
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}
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template<IterableContainer Container>
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constexpr bool all_of(Container&& container, auto const& predicate)
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{
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return all_of(container.begin(), container.end(), predicate);
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}
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}
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using AK::all_of;
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