Trying out some of the new Swift 2 features for pattern matching (What’s New In
Swift around the 19m 35s + mark with Chris Lattner) but not having much
success. I have this in a playground
enum test
{
case one
case two( Int )
case three( String, Int )
}
let x = [ test.one, test.two( 123 ), test.three( "xx", 1 ), test.one,
test.three( "rrr", 7 ), test.two( 9 ) ]
for case test.two( let a ) in x
{
print( "a is \(a) " )
}
Which follows the pattern shown on-screen, as I understand it at least, and in
the updated Swift beta 2 book
I get numerous errors on the ‘for case .’ line, the compiler clearly thinks the
entire line is garbage. I’ve tried taking the ‘case’ word out, that doesn’t
work, I’ve tried taking the ‘test.’ off the start of ‘test.two’, still no good,
possibly worse.
Tried a simple version in an if as well
let y = test.two( 123 )
if case test.two( let a ) == y { } // variable binding in
a condition requires an initializer
I must have tried 10 other combinations as well without any success. I must
have entirely misunderstood the new uniform case pattern matching, or it
doesn’t work in seed 1. The ‘if case’ construct is going to be quite useful,
anyone else have more success?
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