51 lines
1.5 KiB
Nim
51 lines
1.5 KiB
Nim
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#
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#
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# Nim's Runtime Library
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# (c) Copyright 2020 Nim contributors
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#
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# See the file "copying.txt", included in this
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# distribution, for details about the copyright.
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#
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## This module implements the `Isolated[T]` type for
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## safe construction of isolated subgraphs that can be
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## passed efficiently to different channels and threads.
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##
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## .. warning:: This module is experimental and its interface may change.
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##
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type
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Isolated*[T] = object ## Isolated data can only be moved, not copied.
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value: T
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proc `=copy`*[T](dest: var Isolated[T]; src: Isolated[T]) {.error.}
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proc `=sink`*[T](dest: var Isolated[T]; src: Isolated[T]) {.inline.} =
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# delegate to value's sink operation
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`=sink`(dest.value, src.value)
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proc `=destroy`*[T](dest: var Isolated[T]) {.inline.} =
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# delegate to value's destroy operation
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`=destroy`(dest.value)
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# XXX: removed the {.magic: "Isolate".}
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func isolate*[T](value: sink T): Isolated[T] =
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## Creates an isolated subgraph from the expression `value`.
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## Isolation is checked at compile time.
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##
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## Please read https://github.com/nim-lang/RFCs/issues/244
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## for more details.
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Isolated[T](value: value)
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func unsafeIsolate*[T](value: sink T): Isolated[T] =
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## Creates an isolated subgraph from the expression `value`.
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##
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## .. warning:: The proc doesn't check whether `value` is isolated.
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##
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Isolated[T](value: value)
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func extract*[T](src: var Isolated[T]): T =
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## Returns the internal value of `src`.
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## The value is moved from `src`.
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result = move(src.value)
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