averello/swift-mirror
1
0
Fork 0
mirror of https://github.com/apple/swift.git synced 2025-12-14 20:36:38 +01:00
Code Issues Packages Projects Releases Wiki Activity

stdlib: update comments and parameter names for startsWith() algorithm to

Browse Source 
clearly reflect semantics

rdar://17567069


Swift SVN r19681
This commit is contained in:
Dmitri Hrybenko
2014-07-08 09:54:10 +00:00
parent 9f4c417095
commit 8fb09ef13a
1 changed files with 8 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
stdlib/core/Algorithm.swift
View File

@@ -475,25 +475,24 @@ public func split<Seq: Sliceable, R:LogicValue>(
return result
}
/// Return true iff the elements of `e1` are equal to the initial
/// elements of `e2`.
/// Return true iff the the initial elements of `s` are equal to `prefix`.
public func startsWith<
S0: Sequence, S1: Sequence
where
S0.GeneratorType.Element == S1.GeneratorType.Element,
where
S0.GeneratorType.Element == S1.GeneratorType.Element,
S0.GeneratorType.Element : Equatable
>(s0: S0, s1: S1) -> Bool
>(s: S0, prefix: S1) -> Bool
{
var g1 = s1.generate()
var prefixGenerator = prefix.generate()
for e0 in s0 {
var e1 = g1.next()
for e0 in s {
var e1 = prefixGenerator.next()
if !e1 { return true }
if e0 != e1! {
return false
}
}
return g1.next() ? false : true
return prefixGenerator.next() ? false : true
}
public struct EnumerateGenerator<Base: Generator> : Generator, Sequence {