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BinarySearch: constexpr support

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Problem:
- It is not possible to perform a binary search at compile-time
  because `binary_search` is not `constexpr`-aware.

Solution:
- Add `constexpr` support.
This commit is contained in:
Lenny Maiorani 2020-10-13 18:30:35 -04:00 • committed by Andreas Kling
parent 0658051996
commit a274a8e5a0
2 changed files with 17 additions and 2 deletions
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4
AK/BinarySearch.h
View file

@ -33,13 +33,13 @@
namespace AK {
template<typename T>
int integral_compare(const typename RemoveConst<T>::Type& a, const typename RemoveConst<T>::Type& b)
constexpr int integral_compare(const typename RemoveConst<T>::Type& a, const typename RemoveConst<T>::Type& b)
{
return a - b;
}
template<typename T, typename Compare>
T* binary_search(Span<T> haystack, const typename RemoveConst<T>::Type& needle, Compare compare = integral_compare, size_t* nearby_index = nullptr)
constexpr T* binary_search(Span<T> haystack, const typename RemoveConst<T>::Type& needle, Compare compare = integral_compare, size_t* nearby_index = nullptr)
{
if (haystack.size() == 0) {
if (nearby_index)