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When should I create a destructor?
...to catch it?
A destructor may be called on an object after the constructor starts but before the constructor finishes. A properly written destructor will not rely on invariants established in the constructor.
A destructor can "resurrect" an object, making a dead object alive again. That's really wei...
What is the preferred Bash shebang?
.... Shebang itself is undefined under POSIX, so I could make #!stop toaster start the USB coffee machine and be POSIX compliant. So #!/usr/bin/env bash isn't particularly better than #!/bin/bash, it could be less portable depending.
– darkfeline
Mar 8 '18 at 8:0...
Abort Ajax requests using jQuery
...us request, meaning once it's sent it's out there.
In case your server is starting a very expensive operation due to the AJAX request, the best you can do is open your server to listen for cancel requests, and send a separate AJAX request notifying the server to stop whatever it's doing.
Otherwise...
What's the difference if I put css file inside or ?
... is recommended because when you have the CSS declared before <body> starts, your styles has actually loaded already. So very quickly users see something appear on their screen (e.g. background colors). If not, users see blank screen for some time before the CSS reaches the user.
Also, if you ...
Check if table exists in SQL Server
...ill check for the table before running the query and will fail before even starting.
– Marc K
Jan 13 '14 at 6:35
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PostgreSQL LIKE query performance variations
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This only works if the pattern doesn't start with a wildcard - in this case the first two sample queries both start with a wildcard.
– cbz
Jul 25 '19 at 15:15
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How to SSH to a VirtualBox guest externally through a host? [closed]
...VM's Settings > Network. First adapter should be Nat, second Host-only.
Start cmd.exe and run ipconfig /all. You should see lines:
Ethernet adapter VirtualBox Host-Only Network:
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IPv4 Address. . . . . . . . . . . : 192.168.59.1
Second adapter in guest should also be in 192.168.59.*.
S...
Python Regex instantly replace groups
...he groups. Groups are counted the same as by the group(...) function, i.e. starting from 1, from left to right, by opening parentheses.
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how to create a Java Date object of midnight today and midnight tomorrow?
...ght is deprecated, so use this:
DateTime today = new DateTime().withTimeAtStartOfDay();
DateTime tomorrow = today.plusDays(1).withTimeAtStartOfDay();
Pass a time zone if you don't want the JVM’s current default time zone.
DateTimeZone timeZone = DateTimeZone.forID("America/Montreal");
DateTime...
What is the difference between active and passive FTP?
...me here.
However, it then requests the server (on the command channel) to start listening on a port (at the servers discretion) rather than trying to establish a connection back to the client.
As part of this, the server also returns to the client the port number it has selected to listen on, so t...