On Friday, 3 June 2016 at 15:23:16 UTC, Jonathan M Davis wrote:
Thank you for your detailed explanation.
If I have a static immutable object, I don't have to declare it
as shared because it is implicit. Right ?
Changing my __gshared into static shared raises some errors which
I don't know how to address. Ali's chapter doesn't address shared
classes. May I ask for your help ?
1. question
-----------
I had a __gshared Info[N] infos_; that I fill in a static this()
method.
How should I declare this with shared ? Is it enough to write
static shared Info[N] infos; ? Since shared is transitive, will
the info objects be implicitly shared ?
2. question
-----------
As I said above, I instantiate my Info objects in a private
static this() method. The objects are emplaced in a static shared
void array. Since emplace only accept a void[] as argument I had
to cast away the shared as you did in your example. The compiler
seams happy.
However I didn't synchronized that code because I assume it is
executed by the main thread before main starts. There is thus no
risk of race conditions. Is this assumption correct ?
3. error
--------
A weird error is that there is apparently no overload for
opEquals. Do I have to define one my self ? Is this so that users
can synchronize themselves if needed ?
source/app.d(9,13): Error: none of the overloads of 'opEquals'
are callable using argument types (shared(Info), shared(Info)),
candidates are:
/usr/include/dmd/druntime/import/object.d(143,6):
object.opEquals(Object lhs, Object rhs)
/usr/include/dmd/druntime/import/object.d(168,6):
object.opEquals(const(Object) lhs, const(Object) rhs)
I guess I have to define my own opEqual.
4. error
--------
Another error is with writeln(info); where info is now a
shared(Info).
/usr/include/dmd/phobos/std/format.d(2904,5): Error: static
assert "unable to format shared objects"
/usr/include/dmd/phobos/std/format.d(3477,16):
instantiated from here: formatValue!(LockingTextWriter,
shared(Info), char)
/usr/include/dmd/phobos/std/format.d(467,54): instantiated
from here: formatGeneric!(LockingTextWriter, shared(Info), char)
/usr/include/dmd/phobos/std/stdio.d(1316,31): instantiated
from here: formattedWrite!(LockingTextWriter, char, shared(Info))
/usr/include/dmd/phobos/std/stdio.d(3114,28): instantiated
from here: write!(shared(Info), char)
source/app.d(12,12): instantiated from here:
writeln!(shared(Info))
How can I solve that error ?
