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15b9670888
I feel like the implementations are actually simpler if we split them. This will also allow us to add more advanced logic to the JSON compilation database build system in the future, such as inferring the toolchain from the compile command.
34 lines
1.1 KiB
Swift
34 lines
1.1 KiB
Swift
//===----------------------------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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/// A value that is computed on its first access and saved for later retrievals.
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package enum LazyValue<T> {
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case computed(T)
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case uninitialized
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/// If the value has already been computed return it, otherwise compute it using `compute`.
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package mutating func cachedValueOrCompute(_ compute: () -> T) -> T {
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switch self {
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case .computed(let value):
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return value
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case .uninitialized:
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let newValue = compute()
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self = .computed(newValue)
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return newValue
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}
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}
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package mutating func reset() {
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self = .uninitialized
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}
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}
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