Comments (4)
from protocoled.
Use new concept api once its finally merged: nim-lang/Nim#15251
from protocoled.
next gen syntax:
type
PExpr {.runtime.} = concept
proc eval(x: Self): int
impl PExpr:
type
PLiteral = ref object
x: int
proc newLit(x: int): PLiteral =
result = PLiteral(x: x)
proc eval(x: PLiteral): int = x.x
impl PExpr:
type
PPlusExpr = ref object
a, b: PExpr
proc newPlus(a, b: PExpr): PPlusExpr =
result = PPlusExpr(a: a, b: b)
proc eval(x: PPlusExpr): int = eval(x.a) + eval(x.b)
#Also valid:
type
PPlusExpr {.impl: PExpr.} = ref object
a, b: PExpr
proc eval(x: PLiteral): int {.impl: PExpr.} = x.x
from protocoled.
#2 This is also valid:
type
PPlusExpr {.impl: PExpr.} = concept
var a, b: PExpr
proc newPlus(a, b: PExpr): PPlusExpr =
result = PPlusExpr(a: a, b: b)
proc eval(x: PPlusExpr): int = eval(x.a) + eval(x.b)
from protocoled.
Related Issues (1)
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