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
