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Alias sugar #11686

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19 changes: 19 additions & 0 deletions lib/pure/sugar.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -238,3 +238,22 @@ macro distinctBase*(T: typedesc): untyped =
while typeSym.typeKind == ntyDistinct:
typeSym = getTypeImpl(typeSym)[0]
typeSym.freshIdentNodes

template alias*(name: untyped, bodyOrExpr: untyped): untyped =
## Syntax sugar to create aliases.
##
## Notes:
## Contrary to `let`, aliases are not allocated in memory.
## This is useful to access deep nested object fields
## without incurring the cost of allocation.
runnableExamples:
type Node = ref object
left, right: Node
val: int

let t = Node(left: Node(left: Node(left: Node(val: 10))))
alias(t3, t.left.left.left)

doAssert t3.val == 10

template name(): untyped {.dirty.} = bodyOrExpr