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Example of using dispatch_once() in Swift
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| import Foundation | |
| var token: dispatch_once_t = 0 | |
| func test() { | |
| dispatch_once(&token) { | |
| println("This is printed only on the first call to test()") | |
| } | |
| println("This is printed for each call to test()") | |
| } | |
| for _ in 0..<4 { | |
| test() | |
| } | |
| /* Output: | |
| This is printed only on the first call to test() | |
| This is printed for each call to test() | |
| This is printed for each call to test() | |
| This is printed for each call to test() | |
| This is printed for each call to test() | |
| */ |
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