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Tacit unwrapping.

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This commit is contained in:
Rob Rix 2015-10-22 13:05:16 -04:00
parent 89adf2cc86
commit 4cc87bc0cf
1 changed files with 2 additions and 2 deletions
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4
prototype/Doubt/TermType.swift
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@ -15,14 +15,14 @@ extension TermType {
///
/// Folds the tree encoded by the receiver into a single value by recurring top-down through the tree, applying `transform` to leaves, then to branches, and so forth.
public func cata<Result>(transform: Syntax<Result, LeafType> -> Result) -> Result {
return self |> ({ $0.unwrap } >>> { $0.map { $0.cata(transform) } } >>> transform)
return self |> (Self.unwrap >>> { $0.map { $0.cata(transform) } } >>> transform)
}
/// Paramorphism over `TermType`s.
///
/// Folds the tree encoded by the receiver into a single value by recurring top-down through the tree, applying `transform` to leaves, then to branches, and so forth. Each recursive instance is made available in the `Syntax` alongside the result value at that node.
public func para<Result>(transform: Syntax<(Self, Result), LeafType> -> Result) -> Result {
return self |> ({ $0.unwrap } >>> { $0.map { ($0, $0.para(transform)) } } >>> transform)
return self |> (Self.unwrap >>> { $0.map { ($0, $0.para(transform)) } } >>> transform)
}