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typetraits: add toSigned, toUnsigned (#18445)

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* typetraits: add toSigned, toUnsigned

* improve and add tests

Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
Co-authored-by: flywind <xzsflywind@gmail.com>
This commit is contained in:
Timothee Cour 2022-04-07 14:38:01 -07:00 • committed by GitHub
commit e78ef57c93
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7 changed files with 85 additions and 33 deletions
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15
lib/std/private/bitops_utils.nim
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@ -10,8 +10,13 @@ template forwardImpl*(impl, arg) {.dirty.} =
else:
impl(x.uint64)
template toUnsigned*(x: int8): uint8 = cast[uint8](x)
template toUnsigned*(x: int16): uint16 = cast[uint16](x)
template toUnsigned*(x: int32): uint32 = cast[uint32](x)
template toUnsigned*(x: int64): uint64 = cast[uint64](x)
template toUnsigned*(x: int): uint = cast[uint](x)
# this could also be implemented via:
# import std/typetraits
# template castToUnsigned*(x: SomeInteger): auto = cast[toUnsigned(typeof(x))](x)
template castToUnsigned*(x: int8): uint8 = cast[uint8](x)
template castToUnsigned*(x: int16): uint16 = cast[uint16](x)
template castToUnsigned*(x: int32): uint32 = cast[uint32](x)
template castToUnsigned*(x: int64): uint64 = cast[uint64](x)
template castToUnsigned*(x: int): uint = cast[uint](x)
template castToUnsigned*[T: SomeUnsignedInt](x: T): T = x