mirror of
https://github.com/oliverbooth/X10D
synced 2024-11-10 02:25:41 +00:00
style/perf: reduce complexity of MinMax and MinMaxBy
This commit is contained in:
parent
121c3a388a
commit
e0bdaaddce
@ -1,4 +1,6 @@
|
||||
using System.Runtime.InteropServices;
|
||||
#if NET5_0_OR_GREATER
|
||||
using System.Runtime.InteropServices;
|
||||
#endif
|
||||
|
||||
namespace X10D.Linq;
|
||||
|
||||
@ -50,37 +52,15 @@ public static class EnumerableExtensions
|
||||
#endif
|
||||
|
||||
comparer ??= Comparer<T>.Default;
|
||||
T? minValue;
|
||||
T? maxValue;
|
||||
|
||||
// ReSharper disable once PossibleMultipleEnumeration
|
||||
if (source.TryGetSpan(out ReadOnlySpan<T> span))
|
||||
{
|
||||
if (span.IsEmpty)
|
||||
{
|
||||
throw new InvalidOperationException("Source contains no elements");
|
||||
return MinMaxSpan(comparer, span);
|
||||
}
|
||||
|
||||
minValue = span[0];
|
||||
maxValue = minValue;
|
||||
|
||||
for (var index = 1; (uint)index < (uint)span.Length; index++)
|
||||
{
|
||||
T current = span[index];
|
||||
|
||||
if (comparer.Compare(current, minValue) < 0)
|
||||
{
|
||||
minValue = current;
|
||||
}
|
||||
|
||||
if (comparer.Compare(current, maxValue) > 0)
|
||||
{
|
||||
maxValue = current;
|
||||
}
|
||||
}
|
||||
|
||||
return (minValue, maxValue);
|
||||
}
|
||||
T? minValue;
|
||||
T? maxValue;
|
||||
|
||||
// ReSharper disable once PossibleMultipleEnumeration
|
||||
using (IEnumerator<T> enumerator = source.GetEnumerator())
|
||||
@ -175,37 +155,15 @@ public static class EnumerableExtensions
|
||||
#endif
|
||||
|
||||
comparer ??= Comparer<TResult>.Default;
|
||||
TResult? minValue;
|
||||
TResult? maxValue;
|
||||
|
||||
// ReSharper disable once PossibleMultipleEnumeration
|
||||
if (source.TryGetSpan(out ReadOnlySpan<TSource> span))
|
||||
{
|
||||
if (span.IsEmpty)
|
||||
{
|
||||
throw new InvalidOperationException("Source contains no elements");
|
||||
return MinMaxSpan(selector, comparer, span);
|
||||
}
|
||||
|
||||
minValue = selector(span[0]);
|
||||
maxValue = minValue;
|
||||
|
||||
for (var index = 1; (uint)index < (uint)span.Length; index++)
|
||||
{
|
||||
TResult current = selector(span[index]);
|
||||
|
||||
if (minValue is null || comparer.Compare(current, minValue) < 0)
|
||||
{
|
||||
minValue = current;
|
||||
}
|
||||
|
||||
if (maxValue is null || comparer.Compare(current, maxValue) > 0)
|
||||
{
|
||||
maxValue = current;
|
||||
}
|
||||
}
|
||||
|
||||
return (minValue, maxValue);
|
||||
}
|
||||
TResult? minValue;
|
||||
TResult? maxValue;
|
||||
|
||||
// ReSharper disable once PossibleMultipleEnumeration
|
||||
using (IEnumerator<TSource> enumerator = source.GetEnumerator())
|
||||
@ -305,31 +263,7 @@ public static class EnumerableExtensions
|
||||
// ReSharper disable once PossibleMultipleEnumeration
|
||||
if (source.TryGetSpan(out ReadOnlySpan<TSource> span))
|
||||
{
|
||||
if (span.IsEmpty)
|
||||
{
|
||||
throw new InvalidOperationException("Source contains no elements");
|
||||
}
|
||||
|
||||
minValue = span[0];
|
||||
maxValue = minValue;
|
||||
|
||||
for (var index = 1; (uint)index < (uint)span.Length; index++)
|
||||
{
|
||||
TSource current = span[index];
|
||||
TResult transformedCurrent = keySelector(current);
|
||||
|
||||
if (minValue is null || comparer.Compare(transformedCurrent, keySelector(minValue)) < 0)
|
||||
{
|
||||
minValue = current;
|
||||
}
|
||||
|
||||
if (maxValue is null || comparer.Compare(transformedCurrent, keySelector(maxValue)) > 0)
|
||||
{
|
||||
maxValue = current;
|
||||
}
|
||||
}
|
||||
|
||||
return (minValue, maxValue);
|
||||
return MinMaxSelectedSpan(keySelector, comparer, span);
|
||||
}
|
||||
|
||||
// ReSharper disable once PossibleMultipleEnumeration
|
||||
@ -363,6 +297,95 @@ public static class EnumerableExtensions
|
||||
return (minValue, maxValue);
|
||||
}
|
||||
|
||||
private static (T? Minimum, T? Maximum) MinMaxSpan<T>(IComparer<T> comparer, ReadOnlySpan<T> span)
|
||||
{
|
||||
if (span.IsEmpty)
|
||||
{
|
||||
throw new InvalidOperationException("Source contains no elements");
|
||||
}
|
||||
|
||||
T minValue = span[0];
|
||||
T maxValue = minValue;
|
||||
|
||||
for (var index = 1; (uint)index < (uint)span.Length; index++)
|
||||
{
|
||||
T current = span[index];
|
||||
|
||||
if (comparer.Compare(current, minValue) < 0)
|
||||
{
|
||||
minValue = current;
|
||||
}
|
||||
|
||||
if (comparer.Compare(current, maxValue) > 0)
|
||||
{
|
||||
maxValue = current;
|
||||
}
|
||||
}
|
||||
|
||||
return (minValue, maxValue);
|
||||
}
|
||||
|
||||
private static (TSource? Minimum, TSource? Maximum) MinMaxSelectedSpan<TSource, TResult>(Func<TSource, TResult> keySelector,
|
||||
IComparer<TResult> comparer,
|
||||
ReadOnlySpan<TSource> span)
|
||||
{
|
||||
if (span.IsEmpty)
|
||||
{
|
||||
throw new InvalidOperationException("Source contains no elements");
|
||||
}
|
||||
|
||||
TSource minValue = span[0];
|
||||
TSource maxValue = minValue;
|
||||
|
||||
for (var index = 1; (uint)index < (uint)span.Length; index++)
|
||||
{
|
||||
TSource current = span[index];
|
||||
TResult transformedCurrent = keySelector(current);
|
||||
|
||||
if (minValue is null || comparer.Compare(transformedCurrent, keySelector(minValue)) < 0)
|
||||
{
|
||||
minValue = current;
|
||||
}
|
||||
|
||||
if (maxValue is null || comparer.Compare(transformedCurrent, keySelector(maxValue)) > 0)
|
||||
{
|
||||
maxValue = current;
|
||||
}
|
||||
}
|
||||
|
||||
return (minValue, maxValue);
|
||||
}
|
||||
|
||||
private static (TResult?, TResult?) MinMaxSpan<TSource, TResult>(Func<TSource, TResult> selector,
|
||||
IComparer<TResult> comparer,
|
||||
ReadOnlySpan<TSource> span)
|
||||
{
|
||||
if (span.IsEmpty)
|
||||
{
|
||||
throw new InvalidOperationException("Source contains no elements");
|
||||
}
|
||||
|
||||
TResult minValue = selector(span[0]);
|
||||
TResult maxValue = minValue;
|
||||
|
||||
for (var index = 1; (uint)index < (uint)span.Length; index++)
|
||||
{
|
||||
TResult current = selector(span[index]);
|
||||
|
||||
if (minValue is null || comparer.Compare(current, minValue) < 0)
|
||||
{
|
||||
minValue = current;
|
||||
}
|
||||
|
||||
if (maxValue is null || comparer.Compare(current, maxValue) > 0)
|
||||
{
|
||||
maxValue = current;
|
||||
}
|
||||
}
|
||||
|
||||
return (minValue, maxValue);
|
||||
}
|
||||
|
||||
private static bool TryGetSpan<TSource>(this IEnumerable<TSource> source, out ReadOnlySpan<TSource> span)
|
||||
{
|
||||
#if NET6_0_OR_GREATER
|
||||
|
Loading…
Reference in New Issue
Block a user