39 lines
1.4 KiB
Nim
39 lines
1.4 KiB
Nim
# Hardy
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# Copyright (c) 2018 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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type
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BaseUint* = SomeUnsignedInt or byte
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HardBase*[T: BaseUint] = distinct T
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HardBool*[T: HardBase] = range[T(0)..T(1)]
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## To avoid the compiler replacing bitwise boolean operations
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## by conditional branches, we don't use booleans.
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## We use an int to prevent compiler "optimization" and introduction of branches
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Hard*[T: HardBase] = distinct openarray[T]
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## Hardy primitives are memory-backend agnostic.
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## Hardy integers can be stored in an opaque stack array
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## or a seq or even a string.
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##
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## Allocations is left to the client library.
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## Note that constant-time allocation is very involved for
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## heap-allocated types (i.e. requires a memory pool)
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func htrue*(T: type(BaseUint)): auto {.compileTime.}=
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(HardBool[HardBase[T]])(true)
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func hfalse*(T: type(BaseUint)): auto {.compileTime.}=
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(HardBool[HardBase[T]])(false)
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template hard*(x: static int, T: type BaseUint): HardBase[T] =
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## For int literals
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(HardBase[T])(x)
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template hard*(x: BaseUint): HardBase[type x] =
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(HardBase[T])(x)
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