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fix of procs + runnableExamples (#16932)

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Timothee Cour
2021-02-05 07:32:10 -08:00
committed by GitHub
parent 6dc7ece36a
commit 3eebbb234d
1 changed files with 25 additions and 8 deletions
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33
lib/system.nim
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@@ -904,14 +904,31 @@ template disarm*(x: typed) =
## experimental API!
x = nil
proc `of`*[T, S](x: typedesc[T], y: typedesc[S]): bool {.magic: "Of", noSideEffect.}
proc `of`*[T, S](x: T, y: typedesc[S]): bool {.magic: "Of", noSideEffect.}
proc `of`*[T, S](x: T, y: S): bool {.magic: "Of", noSideEffect.}
## Checks if `x` has a type of `y`.
##
## .. code-block:: Nim
## assert(FloatingPointDefect of Exception)
## assert(DivByZeroDefect of Exception)
proc `of`*[T, S](x: T, y: typedesc[S]): bool {.magic: "Of", noSideEffect.} =
## Checks if `x` is an instance of `y`.
runnableExamples:
type
Base = ref object of RootObj
Sub1 = ref object of Base
Sub2 = ref object of Base
Unrelated = ref object
var base: Base = Sub1() # downcast
doAssert base of Base # generates `CondTrue` (statically true)
doAssert base of Sub1
doAssert base isnot Sub1
doAssert not (base of Sub2)
base = Sub2() # re-assign
doAssert base of Sub2
doAssert Sub2(base) != nil # upcast
doAssertRaises(ObjectConversionDefect): discard Sub1(base)
var sub1 = Sub1()
doAssert sub1 of Base
doAssert sub1.Base of Sub1
doAssert not compiles(base of Unrelated)
proc cmp*[T](x, y: T): int =
## Generic compare proc.