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Add Enum generic overloads #33589

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merged 1 commit into from Jul 13, 2020
Merged

Add Enum generic overloads #33589

merged 1 commit into from Jul 13, 2020

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hughbe
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@hughbe hughbe commented Mar 14, 2020

Fixes #2364
Contributes to #20008
Maybe fixes #18063

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Note regarding the new-api-needs-documentation label:

This serves as a reminder for when your PR is modifying a ref *.cs file and adding/modifying public APIs, to please make sure the API implementation in the src *.cs file is documented with triple slash comments, so the PR reviewers can sign off that change.

stephentoub
stephentoub reviewed Mar 16, 2020
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src/libraries/Common/tests/CoreFx.Private.TestUtilities/System/PlatformDetection.cs Outdated
#else
public static bool IsReflectionEmitSupported = true;
public static bool IsReflectionEmitSupported => true;
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Why did these change as part of this PR?

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Because I need to use ConditionalFact, which only supports properties and not fields

stephentoub
stephentoub reviewed Mar 16, 2020
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src/libraries/System.Private.CoreLib/src/System/Enum.cs Outdated
=> (TEnum[])GetValues(typeof(TEnum));

public static bool IsDefined<TEnum>(TEnum value) where TEnum : struct, Enum
=> IsDefined(typeof(TEnum), value);
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What is the benefit of this method if it's just going to box the argument? Just being able to write Enum.IsDefined(value) instead of Enum.IsDefined(typeof(MyEnum), value)?

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@jkotas jkotas Mar 16, 2020 •
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This can be certainly implemented more efficiently. It just needs to do this:

runtime/src/libraries/System.Private.CoreLib/src/System/RuntimeType.cs

Lines 267 to 270 in 25ea6c4

ulong[] ulValues = Enum.InternalGetValues(this);
ulong ulValue = Enum.ToUInt64(value);
return Array.BinarySearch(ulValues, ulValue) >= 0;

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This is true. I will investigate this tomorrow. Just rebasing now to make sure it all builds

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@stephentoub One benefit would be that the value and type cannot be accidentally mismatched.

@hughbe hughbe force-pushed the Enum-Generic-tests branch 4 times, most recently from 18d04fb to fe1ba0a Compare March 21, 2020 09:19
@jaredpar jaredpar mentioned this pull request Mar 21, 2020
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@hughbe the Preview 7 cutoff is quickly approaching (July 15th). Please try to address feedback before then. Thanks

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hughbe commented Jul 9, 2020

Okay. Working on this now, sorry for the delay!

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hughbe commented Jul 9, 2020

I moved some stuff around because it was shared between mono/CoreCLR, and optimized the implementation of IsDefined

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hughbe commented Jul 9, 2020 •
edited

Jan, could you also check if there are any worthwile opportunities to optimise the generic functions. I could avoid a few checks like IsEnum on RuntimeType in things like GetValues etc, but didn't think it was worth the code duplication. Alternatively I could implement RuntimeType APIs in terms of Enum generic functions? Actually this would not be possible i think

@jaredpar jaredpar mentioned this pull request Jul 9, 2020
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jkotas commented Jul 9, 2020

Agree. The reason for adding these APIs is syntax sugar, not performance.

@akoeplinger akoeplinger requested a review from jkotas July 13, 2020 15:34
jkotas
jkotas approved these changes Jul 13, 2020
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Thank you!

@jkotas jkotas merged commit 7b2e585 into dotnet:master Jul 13, 2020
@hughbe hughbe deleted the Enum-Generic-tests branch July 13, 2020 16:46
@jkotas jkotas mentioned this pull request Jul 21, 2020
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@stephentoub stephentoub stephentoub left review comments

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@akoeplinger akoeplinger akoeplinger approved these changes

@jkotas jkotas jkotas approved these changes

@EgorBo EgorBo Awaiting requested review from EgorBo

@marek-safar marek-safar Awaiting requested review from marek-safar

@steveisok steveisok Awaiting requested review from steveisok

@vargaz vargaz Awaiting requested review from vargaz

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