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lazy variables in Swift - should be read-only
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Gerriet M. Denkmann
This works:
lazy var session = makeSession() func makeSession() -> URLSession { let sessionConfig = URLSessionConfiguration.ephemeral return URLSession( configuration: sessionConfig ) } First: is it possible to avoid this one-time function “makeSession” ? (Assume that makeSession could not be reduced to one line, e.g. add a print() into it) More important: anybody can set any value to “session”. This is not what I want. What I really want: • session should be set exactly once at the first time it is used. • the compiler should generate an error if somebody tries to set it (like with “let”). Can this be accomplished? If so, how? Gerriet. |
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Quincey Morris
On Jul 11, 2018, at 00:04 , Gerriet M. Denkmann <g@...> wrote:
You can do something like this: private(set) lazy var session: URLSession = { It’s settable from within its class or struct, but not from outside, which is as close as you can get to ‘lazy let’ AFAIK. |
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