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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>
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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
tests/metatype/ttypetraits.nim
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@ -1,6 +1,21 @@
import typetraits
import macros
block: # toUnsigned, toSigned
var a1: toSigned(int16)
doAssert a1 is int16
var a2: toSigned(uint16)
doAssert $a2.typeof == "int16"
doAssert toSigned(uint32) is int32
doAssert uint64.toSigned is int64
doAssert int64.toSigned is int64
doAssert int64.toUnsigned is uint64
doAssert int.toUnsigned is uint
doAssert $uint.toUnsigned == "uint"
# disallowed for now
doAssert not compiles(toUnsigned(range[0..7]))
doAssert not compiles(toSigned(range[0..7]))
block: # isNamedTuple
type Foo1 = (a:1,).type
type Foo2 = (Field0:1,).type