On 19/05/2016 10:08 PM, Thorsten Sommer wrote:
Dear community,
I tried to create a kind of collector module which collects strings by
using a shared appender!string. Why? To collect KPIs at a huge program
across multiple classes and threads and store it later as e.g. CSV file
in order to analyse it by using R.
But I failed...
Attempt #1: I tried what I would do in Java and C#: Using a Singelton
pattern. But it was not as easy to create it in D and I found out, that
today the Singleton is considered as anti-pattern. My conclusion was:
Okay, that is right. Why should I force OOP in D to realize a Singleton?
I can use different paradigm with D -- so just create a module with a
shared appender!string ... cf. attempt #2.
Attempt #2: https://dpaste.dzfl.pl/6035b6fdd4bd
My second attempt was to make my appender "sb" shared. But I got this
compiler error:
std/array.d(3118): Error: 'auto' can only be used as part of 'auto ref'
for template function parameters
Do I used a wrong syntax or is this a bug?
Attempt #3: https://dpaste.dzfl.pl/1e5df9cf08c6
Okay, the third attempt. I searched around and found the
Appender!(shared(string)) syntax. That version compiles and it runs
fine. But the "sb" is not shared, because the "four" output is missing
(cf. dpaste).
Can anyone help me? I am stucked...
Best regards,
Thorsten
At this point I'd recommend you to just ignore Appender.
Write your own.
After all, all it does is this:
T[] data_;
size_t realLen;
void add(T v) {
if (realLen + 1 > data.length) {
data_.length += x;
}
data_[realLen] = v;
realLen++;
}
T[] data() { return data_; }
Okay okay, I simplified things quite a bit.
