mratsim
commented
1 month ago Notice that if not in an UncheckedArray or a seq, the following compiles
import std/bitops
const WordBitWidth = sizeof(pointer) * 8
func wordsRequired*(bits: int): int {.inline.} =
const divShiftor = fastLog2(uint32(WordBitWidth))
result = (bits + WordBitWidth - 1) shr divShiftor
type
Algebra* = enum
BLS12_381
BigInt*[bits: static int] = object
limbs*: array[wordsRequired(bits), uint]
Fr*[Name: static Algebra] = object
residue_form*: BigInt[255]
Fp*[Name: static Algebra] = object
residue_form*: BigInt[381]
FF*[Name: static Algebra] = Fp[Name] or Fr[Name]
type
EC_ShortW_Aff*[F] = object
## Elliptic curve point for a curve in Short Weierstrass form
## y² = x³ + a x + b
##
## over a field F
x*, y*: F
template getScalarField*(EC: type EC_ShortW_Aff): untyped =
Fr[EC.F.Name]
# ------------------------------------------------------------------------------
type IpaProof*[logN: static int, EC] = object
L*{.align: 64.}: array[logN, EC]
R*{.align: 64.}: array[logN, EC]
a0*: getScalarField(EC) # compiles
# a0*: EC.getScalarField() # Error: in expression 'EC.getScalarField()': identifier expected, but found 'EC.getScalarField'
func new*(T: type IpaProof): T =
discard
# ------------------------------------------------------------------------------
proc main() =
let proof = IpaProof[8, EC_ShortW_Aff[Fp[BLS12_381]]].new()
main()
juancarlospaco
github-actions[bot]
metagn
A slight modification to #23853, depending if we use method call syntax or function call syntax we get either identifier expected or a compiler segfault on uninitialized value