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why cannot spawn function defined in unittest block {}?
Jun 20, 2020
mw
Jun 20, 2020
mw
Jun 20, 2020
Adam D. Ruppe
Jun 20, 2020
mw
Jun 20, 2020
mw
June 20, 2020
Gravatar of mwPosted by mwReply
mw
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put the code from:

https://tour.dlang.org/tour/en/multithreading/synchronization-sharing

in file, and put unittest block from safePrint() to main()

as here:

https://github.com/mingwugmail/dlang_tour/blob/master/spawn_in_unittest.d#L33

-----------------
$ dmd -unittest spawn_in_unittest.d
spawn_in_unittest.d(87): Error: template std.concurrency.spawn cannot deduce function from argument types !()(void delegate(shared(SafeQueue!int) queue, shared(int)* queueCounter) @system, shared(SafeQueue!int), shared(int)*), candidates are:
/usr/include/dmd/phobos/std/concurrency.d(460):        spawn(F, T...)(F fn, T args)
  with F = void delegate(shared(SafeQueue!int), shared(int)*) @system,
       T = (shared(SafeQueue!int), shared(int)*)
  must satisfy the following constraint:
       isSpawnable!(F, T)
spawn_in_unittest.d(88): Error: template std.concurrency.spawn cannot deduce function from argument types !()(void delegate(Tid owner, shared(SafeQueue!int) queue, shared(int)* queueCounter) @system, Tid, shared(SafeQueue!int), shared(int)*), candidates are:
/usr/include/dmd/phobos/std/concurrency.d(460):        spawn(F, T...)(F fn, T args)
  with F = void delegate(Tid, shared(SafeQueue!int), shared(int)*) @system,
       T = (Tid, shared(SafeQueue!int), shared(int)*)
  must satisfy the following constraint:
       isSpawnable!(F, T)
-----------------

spawn in unitest: why this compiler error? confusing message
June 20, 2020
Gravatar of mwPosted by mw
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the function defined in unittest become a delegate? how to work-around this?
June 20, 2020
Gravatar of Adam D. RuppePosted by Adam D. Ruppe
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Adam D. Ruppe
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On Saturday, 20 June 2020 at 17:43:42 UTC, mw wrote:
> the function defined in unittest become a delegate? how to work-around this?

just add the keyword static to the functions
June 20, 2020
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On Saturday, 20 June 2020 at 18:01:51 UTC, Adam D. Ruppe wrote:
> On Saturday, 20 June 2020 at 17:43:42 UTC, mw wrote:
>> the function defined in unittest become a delegate? how to work-around this?
>
> just add the keyword static to the functions

https://github.com/mingwugmail/dlang_tour/blob/master/spawn_in_unittest.d#L50

Tried, still doesn't work:

$ dmd -unittest spawn_in_unittest.d
spawn_in_unittest.d(57): Error: static function spawn_in_unittest.__unittest_L33_C1.threadProducer cannot access frame of function spawn_in_unittest.__unittest_L33_C1
spawn_in_unittest.d(74): Error: static function spawn_in_unittest.__unittest_L33_C1.threadConsumer cannot access frame of function spawn_in_unittest.__unittest_L33_C1
June 20, 2020
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On Saturday, 20 June 2020 at 18:08:06 UTC, mw wrote:
> On Saturday, 20 June 2020 at 18:01:51 UTC, Adam D. Ruppe wrote:
>> On Saturday, 20 June 2020 at 17:43:42 UTC, mw wrote:
>>> the function defined in unittest become a delegate? how to work-around this?
>>
>> just add the keyword static to the functions
>
> https://github.com/mingwugmail/dlang_tour/blob/master/spawn_in_unittest.d#L50
>
> Tried, still doesn't work:
>
> $ dmd -unittest spawn_in_unittest.d
> spawn_in_unittest.d(57): Error: static function spawn_in_unittest.__unittest_L33_C1.threadProducer cannot access frame of function spawn_in_unittest.__unittest_L33_C1
> spawn_in_unittest.d(74): Error: static function spawn_in_unittest.__unittest_L33_C1.threadConsumer cannot access frame of function spawn_in_unittest.__unittest_L33_C1

oh, need to add static to all the function the spawned function calls.

static void safePrint(T...)(T args)