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How do C++ class members get initialized if I don't do it explicitly?
...explicit initialization, initialization of members in classes works identically to initialization of local variables in functions.
For objects, their default constructor is called. For example, for std::string, the default constructor sets it to an empty string. If the object's class does not have ...
No connection could be made because the target machine actively refused it?
...
If this happens always, it literally means that the machine exists but that it has no services listening on the specified port, or there is a firewall stopping you.
If it happens occasionally - you used the word "sometimes" - and retrying succeeds, it is l...
Append integer to beginning of list in Python [duplicate]
...original list? It could be an argument to a function for instance and the caller doesn't expect the list to be modified and it would introduce an error into the program to do so.
– BlackJack
Oct 19 '16 at 12:50
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What is bootstrapping?
... I've yet to come across even a poor explanation of what bootstrapping actually is; rather, it seems as though everyone is just supposed to know what it means. I don't, though. Near as I can figure, it has something to do with initialization tasks required of an application upon launch, but I coul...
Save PL/pgSQL output from PostgreSQL to a CSV file
...e to your local PC. It also needs to be run as a Postgres "superuser" (normally called "root") because Postgres can't stop it doing nasty things with that machine's local filesystem.
That doesn't actually mean you have to be connected as a superuser (automating that would be a security risk of a di...
Why does .NET use banker's rounding as default?
...m. Over the course of many roundings performed, you will average out that all .5's end up rounding equally up and down. This gives better estimations of actual results if you are for instance, adding a bunch of rounded numbers. I would say that even though it isn't what some may expect, it's prob...
Add floating point value to android resources/values
...ue = outValue.getFloat();
I know that this is confusing (you'd expect call like getResources().getDimension(R.dimen.text_line_spacing)), but Android dimensions have special treatment and pure "float" number is not valid dimension.
Additionally, there is small "hack" to put float number into d...
What is the “Temporary ASP.NET Files” folder for?
...
These are what's known as Shadow Copy Folders.
Simplistically....and I really mean it:
When ASP.NET runs your app for the
first time, it copies any assemblies
found in the /bin folder, copies any
source code files (found for example
in the App_Code folder) and parses
...
Unix shell script to truncate a large file
...
: > filename
: is a no-op in bash (POSIX-compliant), so this essentially just opens the file for writing (which of course truncates the file) and then immediately closes it.
EDIT: as shellter commented, you don't actually need a command to go along with the redirection:
$ echo foo > foo....
How to remove a single, specific object from a ConcurrentBag?
... is no guarantee that repeatedly removing items and putting them back will allow you to iterate over the all the items.
Two alternatives for you:
Remove all items and remember them, until you find the one you want to remove, then put the others back afterwards. Note that if two threads try to do ...