84 lines
2.4 KiB
Nim
84 lines
2.4 KiB
Nim
## Nim-Codex
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## Copyright (c) 2023 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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##
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import std/hashes
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import std/strutils
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import pkg/upraises
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import pkg/json_serialization
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import pkg/json_serialization/std/options
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type
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NBytes* = distinct Natural
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template basicMaths(T: untyped) =
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proc `+` *(x: T, y: static[int]): T = T(`+`(x.Natural, y.Natural))
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proc `-` *(x: T, y: static[int]): T = T(`-`(x.Natural, y.Natural))
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proc `*` *(x: T, y: static[int]): T = T(`*`(x.Natural, y.Natural))
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proc `+` *(x, y: T): T = T(`+`(x.Natural, y.Natural))
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proc `-` *(x, y: T): T = T(`-`(x.Natural, y.Natural))
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proc `*` *(x, y: T): T = T(`*`(x.Natural, y.Natural))
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proc `<` *(x, y: T): bool {.borrow.}
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proc `<=` *(x, y: T): bool {.borrow.}
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proc `==` *(x, y: T): bool {.borrow.}
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proc `+=` *(x: var T, y: T) {.borrow.}
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proc `-=` *(x: var T, y: T) {.borrow.}
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proc `hash` *(x: T): Hash {.borrow.}
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template divMaths(T: untyped) =
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proc `mod` *(x, y: T): T = T(`mod`(x.Natural, y.Natural))
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proc `div` *(x, y: T): Natural = `div`(x.Natural, y.Natural)
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# proc `/` *(x, y: T): Natural = `/`(x.Natural, y.Natural)
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basicMaths(NBytes)
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divMaths(NBytes)
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proc `$`*(ts: NBytes): string = $(int(ts)) & "'NByte"
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proc `'nb`*(n: string): NBytes = parseInt(n).NBytes
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const
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MiB = 1024.NBytes * 1024.NBytes # ByteSz, 1 mebibyte = 1,048,576 ByteSz
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proc MiBs*(v: Natural): NBytes = v.NBytes * MiB
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func divUp*[T: NBytes](a, b : T): int =
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## Division with result rounded up (rather than truncated as in 'div')
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assert(b != T(0))
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if a==T(0): int(0) else: int( ((a - T(1)) div b) + 1 )
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proc writeValue*(
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writer: var JsonWriter,
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value: NBytes
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) {.upraises:[IOError].} =
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writer.writeValue value.int
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proc readValue*(
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reader: var JsonReader,
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value: var NBytes
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) {.upraises: [SerializationError, IOError].} =
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value = NBytes reader.readValue(int)
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when isMainModule:
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import unittest2
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suite "maths":
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test "basics":
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let x = 5.NBytes
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let y = 10.NBytes
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check x + y == 15.NBytes
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expect RangeDefect:
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check x - y == 10.NBytes
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check y - x == 5.NBytes
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check x * y == 50.NBytes
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check y div x == 2
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check y > x == true
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check y <= x == false
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