On May 12, 2016, at 10:38 PM, Tyler Fleming Cloutier via swift-users
<swift-users@swift.org> wrote:
>
> Hello everyone,
>
> It does seem like it is currently possible to wrap just the function
> declaration in an #if swift() directive like so:
>
> #if swift(>=3.0)
> public func add(filter filterName: String, path: String) {
> #else // ERROR Expected ‘}’ at end of brace statement
> public func addFilter(filterName: String, path: String) {
> #endif
Swift conditional compilation is not line based. SE-0020 said:
"Like other build configurations, #if swift isn't line-based - it encloses
whole statements or declarations. However, unlike the others, the compiler
won't parse inactive branches guarded by #if swift or emit lex diagnostics, so
syntactic differences for other Swift versions can be in the same file.”
https://github.com/apple/swift-evolution/blob/master/proposals/0020-if-swift-version.md
> Is it possible I’m missing how to do this? This is particularly painful in
> Swift 3 given the change to move have labels on the first function parameter
> by default. As far as I can see it means that I am required to wrap the
> entire function body even if nothing else is incompatible with Swift 3.
My solution: a git branch for 2.x and a git branch for 3.x. Eventually the
2.x branch will wither away.
Marc
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