60 lines
1.8 KiB
Nim
60 lines
1.8 KiB
Nim
# Stint
|
|
# Copyright 2018 Status Research & Development GmbH
|
|
# Licensed under either of
|
|
#
|
|
# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
|
|
# * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
|
|
#
|
|
# at your option. This file may not be copied, modified, or distributed except according to those terms.
|
|
|
|
import ./datatypes
|
|
|
|
func toSubtype*[T: SomeInteger](b: bool, _: typedesc[T]): T {.inline.}=
|
|
b.T
|
|
|
|
func toSubtype*[T: UintImpl | IntImpl](b: bool, _: typedesc[T]): T {.inline.}=
|
|
type SubTy = type result.lo
|
|
result.lo = toSubtype(b, SubTy)
|
|
|
|
func toUint*(n: UintImpl or IntImpl or SomeSignedInt): auto {.inline.}=
|
|
## Casts an unsigned integer to an uint of the same size
|
|
# TODO: uint128 support
|
|
when n.sizeof > 8:
|
|
{.fatal: "Unreachable. You are trying to cast a StUint with more than 64-bit of precision" .}
|
|
elif n.sizeof == 8:
|
|
cast[uint64](n)
|
|
elif n.sizeof == 4:
|
|
cast[uint32](n)
|
|
elif n.sizeof == 2:
|
|
cast[uint16](n)
|
|
else:
|
|
cast[uint8](n)
|
|
|
|
func toUint*(n: SomeUnsignedInt): SomeUnsignedInt {.inline.}=
|
|
## No-op overload of multi-precision int casting
|
|
n
|
|
|
|
func asDoubleUint*(n: UintImpl | SomeUnsignedInt): auto {.inline.} =
|
|
## Convert an integer or StUint to an uint with double the size
|
|
type Double = (
|
|
when n.sizeof == 4: uint64
|
|
elif n.sizeof == 2: uint32
|
|
else: uint16
|
|
)
|
|
|
|
n.toUint.Double
|
|
|
|
func toInt*(n: UintImpl or IntImpl or SomeInteger): auto {.inline.}=
|
|
## Casts an unsigned integer to an uint of the same size
|
|
# TODO: uint128 support
|
|
when n.sizeof > 8:
|
|
{.fatal: "Unreachable. You are trying to cast a StUint with more than 64-bit of precision" .}
|
|
elif n.sizeof == 8:
|
|
cast[int64](n)
|
|
elif n.sizeof == 4:
|
|
cast[int32](n)
|
|
elif n.sizeof == 2:
|
|
cast[int16](n)
|
|
else:
|
|
cast[int8](n)
|