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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.Buffers;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace System.MemoryTests
{
public static partial class ReadOnlyMemoryTests
{
[Fact]
public static void SliceWithStart()
{
int[] a = { 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 };
ReadOnlyMemory<int> memory = new ReadOnlyMemory<int>(a).Slice(6);
Assert.Equal(4, memory.Length);
Assert.True(Unsafe.AreSame(ref a[6], ref Unsafe.AsRef(in MemoryMarshal.GetReference(memory.Span))));
OwnedMemory<int> owner = new CustomMemoryForTest<int>(a);
ReadOnlyMemory<int> memoryFromOwner = ((ReadOnlyMemory<int>)owner.Memory).Slice(6);
Assert.Equal(4, memoryFromOwner.Length);
Assert.True(Unsafe.AreSame(ref a[6], ref Unsafe.AsRef(in MemoryMarshal.GetReference(memoryFromOwner.Span))));
}
[Fact]
public static void SliceWithStartPastEnd()
{
int[] a = { 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 };
ReadOnlyMemory<int> memory = new ReadOnlyMemory<int>(a).Slice(a.Length);
Assert.Equal(0, memory.Length);
Assert.True(Unsafe.AreSame(ref a[a.Length - 1], ref Unsafe.Subtract(ref Unsafe.AsRef(in MemoryMarshal.GetReference(memory.Span)), 1)));
OwnedMemory<int> owner = new CustomMemoryForTest<int>(a);
ReadOnlyMemory<int> memoryFromOwner = ((ReadOnlyMemory<int>)owner.Memory).Slice(a.Length);
Assert.Equal(0, memoryFromOwner.Length);
Assert.True(Unsafe.AreSame(ref a[a.Length - 1], ref Unsafe.Subtract(ref Unsafe.AsRef(in MemoryMarshal.GetReference(memoryFromOwner.Span)), 1)));
}
[Fact]
public static void SliceWithStartAndLength()
{
int[] a = { 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 };
ReadOnlyMemory<int> memory = new ReadOnlyMemory<int>(a).Slice(3, 5);
Assert.Equal(5, memory.Length);
Assert.True(Unsafe.AreSame(ref a[3], ref Unsafe.AsRef(in MemoryMarshal.GetReference(memory.Span))));
OwnedMemory<int> owner = new CustomMemoryForTest<int>(a);
ReadOnlyMemory<int> memoryFromOwner = ((ReadOnlyMemory<int>)owner.Memory).Slice(3, 5);
Assert.Equal(5, memoryFromOwner.Length);
Assert.True(Unsafe.AreSame(ref a[3], ref Unsafe.AsRef(in MemoryMarshal.GetReference(memoryFromOwner.Span))));
}
[Fact]
public static void SliceWithStartAndLengthUpToEnd()
{
int[] a = { 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 };
ReadOnlyMemory<int> memory = new ReadOnlyMemory<int>(a).Slice(4, 6);
Assert.Equal(6, memory.Length);
Assert.True(Unsafe.AreSame(ref a[4], ref Unsafe.AsRef(in MemoryMarshal.GetReference(memory.Span))));
OwnedMemory<int> owner = new CustomMemoryForTest<int>(a);
ReadOnlyMemory<int> memoryFromOwner = ((ReadOnlyMemory<int>)owner.Memory).Slice(4, 6);
Assert.Equal(6, memoryFromOwner.Length);
Assert.True(Unsafe.AreSame(ref a[4], ref Unsafe.AsRef(in MemoryMarshal.GetReference(memoryFromOwner.Span))));
}
[Fact]
public static void SliceWithStartAndLengthPastEnd()
{
int[] a = { 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 };
ReadOnlyMemory<int> memory = new ReadOnlyMemory<int>(a).Slice(a.Length, 0);
Assert.Equal(0, memory.Length);
Assert.True(Unsafe.AreSame(ref a[a.Length - 1], ref Unsafe.Subtract(ref Unsafe.AsRef(in MemoryMarshal.GetReference(memory.Span)), 1)));
OwnedMemory<int> owner = new CustomMemoryForTest<int>(a);
ReadOnlyMemory<int> memoryFromOwner = ((ReadOnlyMemory<int>)owner.Memory).Slice(a.Length, 0);
Assert.Equal(0, memoryFromOwner.Length);
Assert.True(Unsafe.AreSame(ref a[a.Length - 1], ref Unsafe.Subtract(ref Unsafe.AsRef(in MemoryMarshal.GetReference(memoryFromOwner.Span)), 1)));
}
[Fact]
public static void SliceRangeChecks()
{
int[] a = { 90, 91, 92, 93, 94, 95, 96, 97, 98, 99 };
Assert.Throws<ArgumentOutOfRangeException>(() => new ReadOnlyMemory<int>(a).Slice(-1));
Assert.Throws<ArgumentOutOfRangeException>(() => new ReadOnlyMemory<int>(a).Slice(a.Length + 1));
Assert.Throws<ArgumentOutOfRangeException>(() => new ReadOnlyMemory<int>(a).Slice(-1, 0));
Assert.Throws<ArgumentOutOfRangeException>(() => new ReadOnlyMemory<int>(a).Slice(0, a.Length + 1));
Assert.Throws<ArgumentOutOfRangeException>(() => new ReadOnlyMemory<int>(a).Slice(2, a.Length + 1 - 2));
Assert.Throws<ArgumentOutOfRangeException>(() => new ReadOnlyMemory<int>(a).Slice(a.Length + 1, 0));
Assert.Throws<ArgumentOutOfRangeException>(() => new ReadOnlyMemory<int>(a).Slice(a.Length, 1));
OwnedMemory<int> owner = new CustomMemoryForTest<int>(a);
ReadOnlyMemory<int> memory = owner.Memory;
Assert.Throws<ArgumentOutOfRangeException>(() => memory.Slice(-1));
Assert.Throws<ArgumentOutOfRangeException>(() => memory.Slice(a.Length + 1));
Assert.Throws<ArgumentOutOfRangeException>(() => memory.Slice(-1, 0));
Assert.Throws<ArgumentOutOfRangeException>(() => memory.Slice(0, a.Length + 1));
Assert.Throws<ArgumentOutOfRangeException>(() => memory.Slice(2, a.Length + 1 - 2));
Assert.Throws<ArgumentOutOfRangeException>(() => memory.Slice(a.Length + 1, 0));
Assert.Throws<ArgumentOutOfRangeException>(() => memory.Slice(a.Length, 1));
}
[Fact]
public static void SliceWithStartDefaultMemory()
{
ReadOnlyMemory<int> memory = default;
memory = memory.Slice(0);
Assert.True(memory.Equals(default));
}
[Fact]
public static void SliceWithStartAndLengthDefaultMemory()
{
ReadOnlyMemory<int> memory = default;
memory = memory.Slice(0, 0);
Assert.True(memory.Equals(default));
}
}
}
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