Michael Tsai on Twitter: "@iTod Yes, if we're talking about runtime behavior, and we have zero-cost exceptions. But I thought we were talking about codegen."

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Todd Ditchendorf ‏@iTod 19 Jun 2015

I'm curious: What's better about Swift's `defer` than `try/finally` in ObjC or Java (or virtually any other language since 1990)?
1 retweet 1 like
Michael Tsai ‏@mjtsai 19 Jun 2015

@iTod Keep related blocks of code together.
Todd Ditchendorf ‏@iTod 19 Jun 2015

@mjtsai So it is a syntactical difference. Thanks. (AFAICT, this is the only significant difference besides cultural).
Michael Tsai ‏@mjtsai 19 Jun 2015

@iTod Yes, mainly the syntax is much more convenient and readable. And there is the codegen difference because it’s not based on exceptions.
Todd Ditchendorf ‏@iTod 19 Jun 2015

@mjtsai Hm, you're fist to mention that. Is `try/finally` (with no `catch`) significantly different from `defer` from a codegen perspective?
Michael Tsai ‏@mjtsai 19 Jun 2015

@iTod Haven't looked at the assembly, but I would assume yes because try/finally has to essentially catch and rethrow the exception.
1 like
Todd Ditchendorf ‏@iTod 19 Jun 2015

@mjtsai Hm, that's interesting. So they're only different if an exception is thrown. But in non-exceptional case, it should be same as defer

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