1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
/// Runs a cleanup closure (`deferred`) after a given `work` closure,
/// making sure `deferred` is run also when `work` throws an error.
/// - Parameters:
/// - work: The work that should be performed. Will always be executed.
/// - deferred: The cleanup that needs to be done in any case.
/// - Throws: Any error thrown by `deferred` or `work` (in that order).
/// - Returns: The result of `work`.
/// - Note: If `work` **and** `deferred` throw an error,
/// the one thrown by `deferred` is thrown from this function.
/// - SeeAlso: ``withAsyncThrowing(do:defer:)``
public func withThrowing<T>(
do work: () throws -> T,
defer deferred: () throws -> ()
) throws -> T {
do {
let result = try work()
try deferred()
return result
} catch {
try deferred()
throw error
}
}
/// Runs an async cleanup closure (`deferred`) after a given async `work` closure,
/// making sure `deferred` is run also when `work` throws an error.
/// - Parameters:
/// - work: The work that should be performed. Will always be executed.
/// - deferred: The cleanup that needs to be done in any case.
/// - Throws: Any error thrown by `deferred` or `work` (in that order).
/// - Returns: The result of `work`.
/// - Note: If `work` **and** `deferred` throw an error,
/// the one thrown by `deferred` is thrown from this function.
/// - SeeAlso: ``withThrowing(do:defer:)``
public func withAsyncThrowing<T: Sendable>(
do work: @Sendable () async throws -> T,
defer deferred: @Sendable () async throws -> ()
) async throws -> T {
do {
let result = try await work()
try await deferred()
return result
} catch {
try await deferred()
throw error
}
}
|
