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Adds documentation on skipTypes and mapType

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This commit is contained in:
Clay Sweetser 2014-08-09 16:40:58 -04:00
commit f8ea5f1a37
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compiler/ast.nim
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@ -1313,6 +1313,10 @@ proc newSons(father: PNode, length: int) =
setLen(father.sons, length)
proc skipTypes*(t: PType, kinds: TTypeKinds): PType =
## Used throughout the compiler code to test whether a type tree contains or
## doesn't contain a specific type/types - it is often the case that only the
## last child nodes of a type tree need to be searched. This is a really hot
## path within the compiler!
result = t
while result.kind in kinds: result = lastSon(result)