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[SR-5921] Default constructor for structs with default values don't have argument with default value #48480

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NachoSoto opened this issue Sep 18, 2017 · 1 comment
Closed

[SR-5921] Default constructor for structs with default values don't have argument with default value #48480

NachoSoto opened this issue Sep 18, 2017 · 1 comment
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compiler The Swift compiler in itself duplicate Resolution: Duplicates another issue feature A feature request or implementation improvement memberwise init Feature: Memberwise structure initializers swift evolution implemented Flag → feature: A feature that was approved through the Swift evolution process and implemented

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@NachoSoto
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Previous ID SR-5921
Radar None
Original Reporter @NachoSoto
Type Improvement
Status Resolved
Resolution Duplicate
Environment

Swift version 4.0 (swiftlang-900.0.63 clang-900.0.37)

Additional Detail from JIRA
Votes 0
Component/s Compiler
Labels Improvement
Assignee None
Priority Medium

md5: 105944886c15424a8e6da2a6070408e9

duplicates:

  • SR-5534 Memberwise initializers with any number of optional properties

Issue Description:

Consider this struct:

struct A {
    let a1: String
    let a2: Int = 0
}

This works:

_ = A(a1: "") // a2 is 0

However, this doesn't:

error.swift:7:15: error: extra argument 'a2' in call
_ = A(a1: "", a2: 1)
              ^

This is unintuitive. One would expect the default constructor for this struct to be defined as:

init(a1: String, a2: Int = 0) {
    self.a1 = a1
    self.a2 = a2
}

And not what currently seems to be defined as:

init(a1: String) {
    self.a1 = a1
    self.a2 = 0
}
@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@AnthonyLatsis AnthonyLatsis added feature A feature request or implementation duplicate Resolution: Duplicates another issue swift evolution implemented Flag → feature: A feature that was approved through the Swift evolution process and implemented memberwise init Feature: Memberwise structure initializers labels Nov 12, 2022
@AnthonyLatsis
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duplicate of #43955

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Labels
compiler The Swift compiler in itself duplicate Resolution: Duplicates another issue feature A feature request or implementation improvement memberwise init Feature: Memberwise structure initializers swift evolution implemented Flag → feature: A feature that was approved through the Swift evolution process and implemented
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@NachoSoto @AnthonyLatsis