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AK: Add a shuffle utility function
This implements a shuffle function in AK/Random.h which works on any container with size() and curly brace operators. It uses fisher-yates shuffle.
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sideshowbarker
2024-07-17 03:21:31 +09:00
Author: https://github.com/kuzux Commit: https://github.com/SerenityOS/serenity/commit/1cdd3bb74f Pull-request: https://github.com/SerenityOS/serenity/pull/16386 Reviewed-by: https://github.com/AtkinsSJ
12
AK/Random.h
12
AK/Random.h
@ -7,6 +7,7 @@
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#pragma once
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#include <AK/Platform.h>
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#include <AK/StdLibExtras.h>
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#include <AK/Types.h>
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#if defined(AK_OS_SERENITY) || defined(AK_OS_ANDROID)
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@ -52,10 +53,21 @@ inline T get_random()
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u32 get_random_uniform(u32 max_bounds);
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template<typename Collection>
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inline void shuffle(Collection& collection)
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{
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// Fisher-Yates shuffle
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for (size_t i = collection.size() - 1; i >= 1; --i) {
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size_t j = get_random_uniform(i + 1);
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AK::swap(collection[i], collection[j]);
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}
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}
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}
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#if USING_AK_GLOBALLY
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using AK::fill_with_random;
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using AK::get_random;
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using AK::get_random_uniform;
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using AK::shuffle;
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#endif
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