It is one of the user-facing features from John McCall’s ownership manifesto.
Slava
> On Dec 11, 2017, at 3:33 PM, David Zarzycki <d...@znu.io> wrote:
>
> This is a tangent from the original question, but is __shared a planned
> feature? Or just experimental work?
>
> Dave
>
>> On Dec 11, 2017, at 17:12, Slava Pestov <spes...@apple.com> wrote:
>>
>> Sorry, what I meant is that they make sense with our language model, but
>> it’s not surprising that it doesn’t work today. In any case, __shared is not
>> yet completely implemented or even designed, so it doesn’t matter.
>>
>> Slava
>>
>>> On Dec 11, 2017, at 2:05 PM, David Zarzycki <d...@znu.io> wrote:
>>>
>>> Hi Slava,
>>>
>>> Interesting. Did I make a mistake in my test then? Both __shared @escaping
>>> and __shared @autoclosure are failing below.
>>>
>>> Dave
>>>
>>>> On Dec 11, 2017, at 16:58, Slava Pestov via swift-dev
>>>> <swift-dev@swift.org> wrote:
>>>>
>>>> I think perhaps __shared @escaping and __shared @autoclosure should be OK.
>>>> You’re just passing the context as a +0 value instead of +1. Also __shared
>>>> varargs make sense for the same reason. But it’s not important to get that
>>>> working right now.
>>>>
>>>> The others look OK.
>>>>
>>>> Slava
>>>>
>>>>> On Dec 11, 2017, at 1:15 PM, David Zarzycki via swift-dev
>>>>> <swift-dev@swift.org> wrote:
>>>>>
>>>>> Hello! I’m trying to test which ParameterTypeFlags flag combinations are
>>>>> valid. I wrote the following test case. Are the results “as expected”, or
>>>>> are some of the failures incorrect?
>>>>>
>>>>> // RUN: %target-typecheck-verify-swift
>>>>>
>>>>>
>>>>> //
>>>>> // isVariadic is NOT compatible with any flag combinations
>>>>> //
>>>>> // expected-error@+1 {{@autoclosure must not be used on variadic
>>>>> parameters}}
>>>>> func v_and_autoclosure(arg : @autoclosure ()->()...) {}
>>>>> // expected-error@+1 {{@escaping attribute may only be used in function
>>>>> parameter position}}
>>>>> func v_and_escaping(arg : @escaping ()->()...) {}
>>>>> // expected-error@+1 {{'inout' must not be used on variadic parameters}}
>>>>> func v_and_inout(arg : inout Int...) {}
>>>>> // expected-error@+1 {{'__shared' must not be used on variadic
>>>>> parameters}}
>>>>> func v_and_shared(arg : __shared Int...) {}
>>>>>
>>>>> //
>>>>> // 'inout' is NOT compatible with remaining parameter flag combinations
>>>>> //
>>>>> // expected-error@+1 {{parameter must not have multiple '__owned',
>>>>> 'inout', '__shared', 'var', or 'let' specifiers}}
>>>>> func inout_and_shared(arg : inout __shared Int) {}
>>>>> // expected-error@+1 {{'inout' may only be used on parameters}}
>>>>> func inout_and_escaping(arg : @escaping inout ()->()) {}
>>>>> // expected-error@+1 {{@escaping attribute may only be used in function
>>>>> parameter position}}
>>>>> func escaping_and_inout(arg : inout @escaping ()->()) {}
>>>>> // expected-error@+1 {{@autoclosure may only be used on parameters}}
>>>>> func inout_and_autoclosure(arg : inout @autoclosure ()->()) {}
>>>>> // expected-error@+1 {{'inout' may only be used on parameters}}
>>>>> func autoclosure_and_inout(arg : @autoclosure inout ()->()) {}
>>>>>
>>>>> //
>>>>> // '__shared' is NOT compatible with remaining parameter flag combinations
>>>>> //
>>>>> // expected-error@+1 {{'__shared' may only be used on parameters}}
>>>>> func autoclosure_and_shared(arg : @autoclosure __shared ()->()) {}
>>>>> // expected-error@+1 {{@autoclosure may only be used on parameters}}
>>>>> func shared_and_autoclosure(arg : __shared @autoclosure ()->()) {}
>>>>> // expected-error@+1 {{'__shared' may only be used on parameters}}
>>>>> func escaping_and_shared(arg : @escaping __shared ()->()) {}
>>>>> // expected-error@+1 {{@escaping attribute may only be used in function
>>>>> parameter position}}
>>>>> func shared_and_escaping(arg : __shared @escaping ()->()) {}
>>>>>
>>>>> //
>>>>> // @autoclosure and @escaping are the only valid parameter flag
>>>>> combinations
>>>>> //
>>>>> func autoclosure_and_escaping(arg : @autoclosure @escaping ()->()) {}
>>>>> func escaping_and_autoclosure(arg : @escaping @autoclosure ()->()) {}
>>>>> _______________________________________________
>>>>> swift-dev mailing list
>>>>> swift-dev@swift.org
>>>>> https://lists.swift.org/mailman/listinfo/swift-dev
>>>>
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>>>> swift-dev mailing list
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>>>
>>
>
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