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[SR-11156] Add UnsafePointer<Aggregate>[KeyPath] API that applies the field's offset #53553

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atrick opened this issue Jul 18, 2019 · 3 comments
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[SR-11156] Add UnsafePointer<Aggregate>[KeyPath] API that applies the field's offset #53553

atrick opened this issue Jul 18, 2019 · 3 comments
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@glessard
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feature A feature request or implementation standard library Area: Standard library umbrella swift evolution implemented Flag → feature: A feature that was approved through the Swift evolution process and implemented

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@atrick
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atrick commented Jul 18, 2019

Previous ID SR-11156
Radar rdar://problem/53272880
Original Reporter @atrick
Type New Feature
Status Resolved
Resolution Done
Additional Detail from JIRA
Votes 1
Component/s Standard Library
Labels New Feature, LanguageFeatureRequest
Assignee @glessard
Priority Medium

md5: 768476fda63d417c708fa1a0e74fe03b

Issue Description:

Given a pointer to an aggregate, get a pointer to a field. This is necessary to eliminate misuse of
@atrick
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atrick commented Jul 18, 2019

@swift-cicreate

@atrick
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atrick commented Oct 21, 2019

The above example could have been more easily written as

withUnsafePointer(to: val.value) {
 takeIntPtr($0)
}

However, if it's necessary to pass pointers to multiple fields of the same struct, then the keypath approach is a better way:

withUnsafePointer(to: val) {
  takeBoolAndIntPtr($0[\.flag]!, $0[\.value]!)
}

@glessard
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This was part of SE-0334.

#39639

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@AnthonyLatsis AnthonyLatsis added swift evolution implemented Flag → feature: A feature that was approved through the Swift evolution process and implemented and removed new feature labels Nov 11, 2022
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feature A feature request or implementation standard library Area: Standard library umbrella swift evolution implemented Flag → feature: A feature that was approved through the Swift evolution process and implemented
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@glessard @atrick @AnthonyLatsis