Static function variables in Swift

Question

I'm trying to figure out how to declare a static variable scoped only locally to a function in Swift.

In C, this might look something like this:

int foo() {     static int timesCalled = 0;     ++timesCalled;     return timesCalled; } 

In Objective-C, it's basically the same:

- (NSInteger)foo {     static NSInteger timesCalled = 0;     ++timesCalled;     return timesCalled; } 

But I can't seem to do anything like this in Swift. I've tried declaring the variable in the following ways:

static var timesCalledA = 0 var static timesCalledB = 0 var timesCalledC: static Int = 0 var timesCalledD: Int static = 0 

But these all result in errors.

• The first complains "Static properties may only be declared on a type".
• The second complains "Expected declaration" (where static is) and "Expected pattern" (where timesCalledB is)
• The third complains "Consecutive statements on a line must be separated by ';'" (in the space between the colon and static) and "Expected Type" (where static is)
• The fourth complains "Consecutive statements on a line must be separated by ';'" (in the space between Int and static) and "Expected declaration" (under the equals sign)

Answer 1

I don't think Swift supports static variable without having it attached to a class/struct. Try declaring a private struct with static variable.

func foo() -> Int {     struct Holder {         static var timesCalled = 0     }     Holder.timesCalled += 1     return Holder.timesCalled }    7> foo() $R0: Int = 1   8> foo() $R1: Int = 2   9> foo() $R2: Int = 3