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Added System.Memory.Polyfill Project #2339
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| <Project Sdk="Microsoft.NET.Sdk"> | ||
| <Import Project="..\..\tools\common.props" /> | ||
| <PropertyGroup> | ||
| <Description>Adapters for Span APIs</Description> | ||
| <TargetFrameworks>netstandard1.3;netcoreapp2.1</TargetFrameworks> | ||
| <PackageTags>Span Memory Adapter</PackageTags> | ||
| </PropertyGroup> | ||
| <ItemGroup> | ||
| <PackageReference Include="System.Memory" Version="$(SystemMemoryVersion)" /> | ||
| <PackageReference Include="System.Buffers" Version="$(SystemMemoryVersion)" /> | ||
| <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="$(SystemCompilerServicesUnsafeVersion)" /> | ||
| </ItemGroup> | ||
| </Project> |
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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. | ||
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|
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| namespace System | ||
| { | ||
| public static partial class Int32Polyfill | ||
| { | ||
| public static bool TryParse(ReadOnlySpan<char> buffer, out int value) | ||
| { | ||
| #if NETCOREAPP2_1 | ||
| return int.TryParse(buffer, out value); | ||
|
There was a problem hiding this comment. You may want to avoid using the versioned define as it makes it more difficult if you decide to retarget. Instead use There was a problem hiding this comment. But this api exists only in netcoreapp 2.1 There was a problem hiding this comment. You aren't defining targeting here, you're just ifdefing the code. Imagine that you wanted to cross-compile for netcoreapp2.2 as well in the future, you'd need to touch this ifdef for no reason. I think you're more likely to cross-compile for a future version of netcoreapp than you are an older version that doesn't have this API. There was a problem hiding this comment. Yeah, I agree it would work today, but it won't if we ever add new targets. Correct? |
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| #else | ||
| return int.TryParse(buffer.ToString(), out value); | ||
| #endif | ||
| } | ||
| } | ||
| } | ||
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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. | ||
|
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| using System.Buffers; | ||
| using System.IO; | ||
|
|
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| namespace System | ||
| { | ||
| public static partial class MemoryPolyfill | ||
|
There was a problem hiding this comment. I think we want to minimize the number of extensions types. |
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| { | ||
| public static int Read(this Stream stream, Span<byte> buffer) | ||
| { | ||
| #if NETCOREAPP2_1 | ||
| return stream.Read(buffer); | ||
| #else | ||
| byte[] pooled = null; | ||
| try | ||
| { | ||
| pooled = ArrayPool<byte>.Shared.Rent(buffer.Length); | ||
| int read = stream.Read(pooled, 0, pooled.Length); | ||
| pooled.AsSpan(0, read).CopyTo(buffer); | ||
| return read; | ||
| } | ||
| finally | ||
| { | ||
| if(pooled != null) ArrayPool<byte>.Shared.Return(pooled); | ||
| } | ||
| #endif | ||
| } | ||
| } | ||
| } | ||
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| // Copyright (c) Microsoft. All rights reserved. | ||
| // Licensed under the MIT license. See LICENSE file in the project root for full license information. | ||
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| using System.IO; | ||
| using Xunit; | ||
|
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| namespace System.Polyfill.Tests | ||
| { | ||
| public class Int32Tests | ||
| { | ||
| [Fact] | ||
| public void Int32TryParse() | ||
| { | ||
| ReadOnlySpan<char> span = int.MaxValue.ToString().ToCharArray().AsSpan(); | ||
| Assert.True(Int32Polyfill.TryParse(span, out int value)); | ||
| Assert.Equal(int.MaxValue, value); | ||
| } | ||
| } | ||
| } |
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| @@ -0,0 +1,28 @@ | ||
| // Copyright (c) Microsoft. All rights reserved. | ||
| // Licensed under the MIT license. See LICENSE file in the project root for full license information. | ||
|
|
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| using System.IO; | ||
| using Xunit; | ||
|
|
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| namespace System.Polyfill.Tests | ||
| { | ||
| public class StreamTests | ||
| { | ||
| [Fact] | ||
| public void StreamRead() | ||
| { | ||
| var buffer = new byte[100]; | ||
| for (int i = 0; i < buffer.Length; i++) buffer[i] = (byte)i; | ||
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| var stream = new MemoryStream(buffer); | ||
| var span = new Span<byte>(new byte[100]); | ||
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| var read = stream.Read(span); | ||
| Assert.Equal(buffer.Length, read); | ||
| for (int i = 0; i < buffer.Length; i++) | ||
| { | ||
| Assert.Equal(i, span[i]); | ||
| } | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,21 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003"> | ||
| <Import Project="..\..\tools\common.props" /> | ||
| <PropertyGroup> | ||
| <TargetFrameworks>netcoreapp2.1</TargetFrameworks> | ||
| </PropertyGroup> | ||
| <PropertyGroup Condition="'$(TargetsWindows)' == 'true'"> | ||
| <TargetFrameworks>net46;netcoreapp2.1</TargetFrameworks> | ||
| </PropertyGroup> | ||
| <ItemGroup> | ||
| <PackageReference Include="xunit" Version="2.3.1" /> | ||
| <PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" /> | ||
| </ItemGroup> | ||
| <!-- Project references --> | ||
| <ItemGroup> | ||
| <ProjectReference Include="..\..\src\System.Memory.Polyfill\System.Memory.Polyfill.csproj" /> | ||
| </ItemGroup> | ||
| <!-- register for test discovery in Visual Studio --> | ||
| <ItemGroup> | ||
| <Service Include="{82a7f48d-3b50-4b1e-b82e-3ada8210c358}" /> | ||
| </ItemGroup> | ||
| </Project> |
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Would,'t work for implicit cast from
Span<char>?There was a problem hiding this comment.
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Why not? It's not an extension method.
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Ah, true... Is a bit ugly then :)
Static extension method would be better dotnet/csharplang#192 though alas not a thing...