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Implement RuntimeHelpers.Box #100561

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merged 12 commits into from
Apr 6, 2024
Merged

Implement RuntimeHelpers.Box #100561

merged 12 commits into from
Apr 6, 2024

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jkoritzinsky
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Fixes #97341

Implement RuntimeHelpers.Box with the same semantics as the box IL instruction. It creates a new box for value types, returns the existing object for reference types, and throws for byref types and pointers. It also throws a NullReferenceException when boxing a null by-ref (matching CoreCLR's existing behavior).

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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, 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.

@jkoritzinsky jkoritzinsky requested a review from jkotas April 5, 2024 17:16
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@jkotas jkotas left a comment

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Thanks

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[API Proposal]: RuntimeHelpers.Box to create a box around a dynamically-typed byref
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