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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;
namespace System.MemoryTests
{
public static partial class MemoryTests
{
[Fact]
public static void TryCopyTo()
{
int[] src = { 1, 2, 3 };
int[] dst = { 99, 100, 101 };
Memory<int> srcMemory = src;
bool success = srcMemory.TryCopyTo(dst);
Assert.True(success);
Assert.Equal<int>(src, dst);
}
[Fact]
public static void TryCopyToSingle()
{
int[] src = { 1 };
int[] dst = { 99 };
Memory<int> srcMemory = src;
bool success = srcMemory.TryCopyTo(dst);
Assert.True(success);
Assert.Equal<int>(src, dst);
}
[Fact]
public static void TryCopyToArraySegmentImplicit()
{
int[] src = { 1, 2, 3 };
int[] dst = { 5, 99, 100, 101, 10 };
var segment = new ArraySegment<int>(dst, 1, 3);
Memory<int> srcMemory = src;
bool success = srcMemory.TryCopyTo(segment);
Assert.True(success);
Assert.Equal<int>(src, segment);
}
[Fact]
public static void TryCopyToEmpty()
{
int[] src = { };
int[] dst = { 99, 100, 101 };
Memory<int> srcMemory = src;
bool success = srcMemory.TryCopyTo(dst);
Assert.True(success);
int[] expected = { 99, 100, 101 };
Assert.Equal<int>(expected, dst);
}
[Fact]
public static void TryCopyToLonger()
{
int[] src = { 1, 2, 3 };
int[] dst = { 99, 100, 101, 102 };
Memory<int> srcMemory = src;
bool success = srcMemory.TryCopyTo(dst);
Assert.True(success);
int[] expected = { 1, 2, 3, 102 };
Assert.Equal<int>(expected, dst);
}
[Fact]
public static void TryCopyToShorter()
{
int[] src = { 1, 2, 3 };
int[] dst = { 99, 100 };
Memory<int> srcMemory = src;
bool success = srcMemory.TryCopyTo(dst);
Assert.False(success);
int[] expected = { 99, 100 };
Assert.Equal<int>(expected, dst); // TryCopyTo() checks for sufficient space before doing any copying.
}
[Fact]
public static void CopyToShorter()
{
int[] src = { 1, 2, 3 };
int[] dst = { 99, 100 };
Memory<int> srcMemory = src;
Assert.Throws<ArgumentException>(() => srcMemory.CopyTo(dst));
int[] expected = { 99, 100 };
Assert.Equal<int>(expected, dst); // CopyTo() checks for sufficient space before doing any copying.
}
[Fact]
public static void Overlapping1()
{
int[] a = { 90, 91, 92, 93, 94, 95, 96, 97 };
var src = new Memory<int>(a, 1, 6);
var dst = new Memory<int>(a, 2, 6);
src.CopyTo(dst);
int[] expected = { 90, 91, 91, 92, 93, 94, 95, 96 };
Assert.Equal<int>(expected, a);
}
[Fact]
public static void Overlapping2()
{
int[] a = { 90, 91, 92, 93, 94, 95, 96, 97 };
var src = new Memory<int>(a, 2, 6);
var dst = new Memory<int>(a, 1, 6);
src.CopyTo(dst);
int[] expected = { 90, 92, 93, 94, 95, 96, 97, 97 };
Assert.Equal<int>(expected, a);
}
[Fact]
public static void CopyToArray()
{
int[] src = { 1, 2, 3 };
Memory<int> dst = new int[3] { 99, 100, 101 };
src.CopyTo(dst);
Assert.Equal<int>(src, dst.ToArray());
}
[Fact]
public static void CopyToSingleArray()
{
int[] src = { 1 };
Memory<int> dst = new int[1] { 99 };
src.CopyTo(dst);
Assert.Equal<int>(src, dst.ToArray());
}
[Fact]
public static void CopyToEmptyArray()
{
int[] src = { };
Memory<int> dst = new int[3] { 99, 100, 101 };
src.CopyTo(dst);
int[] expected = { 99, 100, 101 };
Assert.Equal<int>(expected, dst.ToArray());
Memory<int> dstEmpty = new int[0] { };
src.CopyTo(dstEmpty);
int[] expectedEmpty = { };
Assert.Equal<int>(expectedEmpty, dstEmpty.ToArray());
}
[Fact]
public static void CopyToLongerArray()
{
int[] src = { 1, 2, 3 };
Memory<int> dst = new int[4] { 99, 100, 101, 102 };
src.CopyTo(dst);
int[] expected = { 1, 2, 3, 102 };
Assert.Equal<int>(expected, dst.ToArray());
}
[Fact]
public static void CopyToShorterArray()
{
int[] src = { 1, 2, 3 };
Memory<int> dst = new int[2] { 99, 100 };
Assert.Throws<ArgumentException>(() => src.CopyTo(dst));
int[] expected = { 99, 100 };
Assert.Equal<int>(expected, dst.ToArray()); // CopyTo() checks for sufficient space before doing any copying.
}
[Fact]
public static void CopyToCovariantArray()
{
string[] src = new string[] { "Hello" };
Memory<object> dst = new object[] { "world" };
src.CopyTo<object>(dst);
Assert.Equal("Hello", dst.Span[0]);
}
}
}
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