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
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.
Is this just an implementation detail that will be changed?
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.”
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
···
On May 12, 2016, at 10:38 PM, Tyler Fleming Cloutier via swift-users <swift-users@swift.org> wrote:
Alternatively, you could move the function body out to a separate closure and call it from differentiated 3 and 2.2 signatures.
I may have written a blog post about this this morning.
-- Erica
···
On May 12, 2016, at 11:38 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
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.
On May 12, 2016, at 11:05 PM, Marco S Hyman <marc@snafu.org> wrote:
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.”
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.