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fix incorrect lenTuple implementation (#13423)

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Timothee Cour 2020-02-19 02:07:18 -08:00 • committed by GitHub
commit 273a93581f
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3 changed files with 48 additions and 11 deletions
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15
lib/pure/typetraits.nim
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@ -71,15 +71,14 @@ proc distinctBase*(T: typedesc): typedesc {.magic: "TypeTrait".}
## Returns base type for distinct types, works only for distinct types.
## compile time error otherwise
import std/macros
macro lenTuple*(t: tuple): int {.since: (1, 1).} =
## Return number of elements of `t`
newLit t.len
macro lenTuple*(t: typedesc[tuple]): int {.since: (1, 1).} =
proc lenTuple*(T: typedesc[tuple]): int {.magic: "TypeTrait", since: (1, 1).}
## Return number of elements of `T`
newLit t.len
since (1, 1):
template lenTuple*(t: tuple): int =
## Return number of elements of `t`
lenTuple(type(t))
since (1, 1):
template get*(T: typedesc[tuple], i: static int): untyped =
@ -87,6 +86,8 @@ since (1, 1):
# Note: `[]` currently gives: `Error: no generic parameters allowed for ...`
type(default(T)[i])
import std/macros
macro genericParams*(T: typedesc): untyped {.since: (1, 1).} =
## return tuple of generic params for generic `T`
runnableExamples: