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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using Xunit;
using System.Runtime.CompilerServices;
namespace System.SpanTests
{
public static partial class SpanTests
{
[Fact]
public static void SliceInt()
{
int[] a = { 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 };
Span<int> span = new Span<int>(a).Slice(6);
Assert.Equal(4, span.Length);
Assert.True(Unsafe.AreSame(ref a[6], ref span.DangerousGetPinnableReference()));
}
[Fact]
public static void SliceIntPastEnd()
{
int[] a = { 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 };
Span<int> span = new Span<int>(a).Slice(a.Length);
Assert.Equal(0, span.Length);
Assert.True(Unsafe.AreSame(ref a[a.Length - 1], ref Unsafe.Subtract<int>(ref span.DangerousGetPinnableReference(), 1)));
}
[Fact]
public static void SliceIntInt()
{
int[] a = { 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 };
Span<int> span = new Span<int>(a).Slice(3, 5);
Assert.Equal(5, span.Length);
Assert.True(Unsafe.AreSame(ref a[3], ref span.DangerousGetPinnableReference()));
}
[Fact]
public static void SliceIntIntUpToEnd()
{
int[] a = { 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 };
Span<int> span = new Span<int>(a).Slice(4, 6);
Assert.Equal(6, span.Length);
Assert.True(Unsafe.AreSame(ref a[4], ref span.DangerousGetPinnableReference()));
}
[Fact]
public static void SliceIntIntPastEnd()
{
int[] a = { 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 };
Span<int> span = new Span<int>(a).Slice(a.Length, 0);
Assert.Equal(0, span.Length);
Assert.True(Unsafe.AreSame(ref a[a.Length - 1], ref Unsafe.Subtract<int>(ref span.DangerousGetPinnableReference(), 1)));
}
[Fact]
public static void SliceIntRangeChecksd()
{
int[] a = { 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 };
Assert.Throws<ArgumentOutOfRangeException>(() => new Span<int>(a).Slice(-1).DontBox());
Assert.Throws<ArgumentOutOfRangeException>(() => new Span<int>(a).Slice(a.Length + 1).DontBox());
Assert.Throws<ArgumentOutOfRangeException>(() => new Span<int>(a).Slice(-1, 0).DontBox());
Assert.Throws<ArgumentOutOfRangeException>(() => new Span<int>(a).Slice(0, a.Length + 1).DontBox());
Assert.Throws<ArgumentOutOfRangeException>(() => new Span<int>(a).Slice(2, a.Length + 1 - 2).DontBox());
Assert.Throws<ArgumentOutOfRangeException>(() => new Span<int>(a).Slice(a.Length + 1, 0).DontBox());
Assert.Throws<ArgumentOutOfRangeException>(() => new Span<int>(a).Slice(a.Length, 1).DontBox());
}
}
}
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