mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-21 23:20:20 +00:00
68 lines
2.3 KiB
C++
68 lines
2.3 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Span.h>
|
|
#include <AK/StdLibExtras.h>
|
|
#include <AK/Types.h>
|
|
|
|
namespace AK {
|
|
|
|
template<typename T>
|
|
int integral_compare(const T& a, const T& b)
|
|
{
|
|
return a - b;
|
|
}
|
|
|
|
template<typename T, typename Compare>
|
|
T* binary_search(Span<T> haystack, const T& needle, Compare compare = integral_compare, int* nearby_index = nullptr)
|
|
{
|
|
int low = 0;
|
|
int high = haystack.size() - 1;
|
|
while (low <= high) {
|
|
int middle = (low + high) / 2;
|
|
int comparison = compare(needle, haystack[middle]);
|
|
if (comparison < 0)
|
|
high = middle - 1;
|
|
else if (comparison > 0)
|
|
low = middle + 1;
|
|
else {
|
|
if (nearby_index)
|
|
*nearby_index = middle;
|
|
return &haystack[middle];
|
|
}
|
|
}
|
|
|
|
if (nearby_index)
|
|
*nearby_index = max(0, min(low, high));
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
}
|
|
|
|
using AK::binary_search;
|