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.forbids pragma: defining forbidden tags (#20050)

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* .forbids pragma: defining illegal effects for proc types

This patch intends to define the opposite of the .tags pragma: a way to define effects which are not allowed in a proc.

* updated documentation and changelogs for the forbids pragma

* renamed notTagEffects to forbiddenEffects

* corrected issues of forbids pragma

the forbids pragma didn't handle simple restrictions properly and it also had issues with subtyping

* removed incorrect character from changelog

* added test to cover the interaction of methods and the forbids pragma

* covering the interaction of the tags and forbids pragmas

* updated manual about the forbids pragma

* removed useless statement

* corrected the subtyping of proc types using the forbids pragma

* updated manual for the forbids pragma

* updated documentations for forbids pragma

* updated nim docs

* updated docs with rsttester.nim

* regenerated documentation

* updated rst docs

* Update changelog.md

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>

* updated changelog

* corrected typo

Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>
This commit is contained in:
Lancer11211 2022-07-26 07:40:49 +02:00 • committed by GitHub
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52
tests/effects/teffects12.nim Normal file
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discard """
action: compile
"""
import std/locks
type
Test2Effect* = object
Test2* = object
value2*: int
Test1Effect* = object
Test1* = object
value1*: int
Main* = object
test1Lock: Lock
test1: Test1
test2Lock: Lock
test2: Test2
proc `=copy`(obj1: var Test2, obj2: Test2) {.error.}
proc `=copy`(obj1: var Test1, obj2: Test1) {.error.}
proc `=copy`(obj1: var Main, obj2: Main) {.error.}
proc withTest1(main: var Main,
fn: proc(test1: var Test1) {.gcsafe, forbids: [Test1Effect].}) {.gcsafe, tags: [Test1Effect, RootEffect].} =
withLock(main.test1Lock):
fn(main.test1)
proc withTest2(main: var Main,
fn: proc(test1: var Test2) {.gcsafe, forbids: [Test2Effect].}) {.gcsafe, tags: [Test2Effect, RootEffect].} =
withLock(main.test2Lock):
fn(main.test2)
proc newMain(): Main =
var test1lock: Lock
initLock(test1Lock)
var test2lock: Lock
initLock(test2Lock)
var main = Main(test1Lock: move(test1Lock), test1: Test1(value1: 1),
test2Lock: move(test2Lock), test2: Test2(value2: 2))
main.withTest1(proc(test1: var Test1) = test1.value1 += 1)
main.withTest2(proc(test2: var Test2) = test2.value2 += 1)
move main
var main = newMain()
main.withTest1(proc(test1: var Test1) =
test1.value1 += 1
main.withTest2(proc(test2: var Test2) = test2.value2 += 1)
)
main.withTest1(proc(test1: var Test1) {.tags: [].} = echo $test1.value1)
main.withTest2(proc(test2: var Test2) {.tags: [].} = echo $test2.value2)