The write is atomic but an increment also requires a read. So the question is: Are you sure the read is safe, in other words, are you sure another thread doing the increment will not end up with the same value to be incremented? I have doubts. The 100% correct way of doing this would … Read more
You should append all the values to a list, that allows you to easily iterate through the values later as well as not littering your namespace with useless variables and magic.
The behavior is well defined in C# and the evaluation order is: Left side i is evaluated to the variable i Right side is evaluated to 0, and i is incremented (now i==1) The assignment is executed, it sets i to 0. (now i==0) The end result is i==0. In general you first create an … Read more
You can try like this : @echo off set Source=C:\TEMP\MyDoc.txt set Destination=E:\MyData\ set Filename=MyDoc set a=1 :loop if exist %Destination%\%Filename%(%a%).txt set /a a+=1 && goto :loop copy %Source% %Destination%\%Filename%(%a%).txt pause
It is more idiomatic to call the prefix increment of the object itself in the postfix increment: X operator++(int) { X copy(*this); ++*this; // call the prefix increment return copy; } The logic of incrementing an X object is thus solely contained inside the prefix version.
It comes from the history of using integer values as booleans. If x is an int, but I am using it as a boolean as per if(x)… then incrementing will mean that whatever its truth value before the operation, it will have a truth-value of true after it (barring overflow). However, it’s impossible to predict … Read more
the answer to my question is not to use let (or shift, or…) but to use i=$((i+1)) when trying to check a bash script by setting ‘exit on non-zero status code‘ with set -e The bash manual states that set -e has the effect of ‘Exit immediately if a simple command exits with a non-zero … Read more
You’re looking for variable indirection, i.e. the ability to refer to a variable indirectly, by a name stored in another variable or returned from an expression. Note, however, that there are usually superior alternatives, such as using arrays or hashtables as multi-value containers – see this answer for an example. If you do need to … Read more
The typical answer to this question, unfortunately posted here already, is that one does the increment “before” remaining operations and the other does the increment “after” remaining operations. Though that intuitively gets the idea across, that statement is on the face of it completely wrong. The sequence of events in time is extremely well-defined in … Read more