[swift-users] Parameter Validation

[Jens Alfke]

> On Dec 7, 2015, at 10:56 AM, Jan Neumüller via swift-users <swift-users at swift.org> wrote:
> 
> But what overhead? As you know Swift has *NO* exceptions. It’s just syntax sugar for normale error values.

Mostly the overhead in the caller of having to pass a (hidden) error parameter into the call, and check the return value and branch afterwards.

(C++/Obj-C exceptions actually have no runtime cost in the normal success case; it’s only throwing an exception that’s expensive.)

—Jens
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