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Purpose of Unions in C and C++
...son people miss it quite often.
The purpose of union is to save memory by using the same memory region for storing different objects at different times. That's it.
It is like a room in a hotel. Different people live in it for non-overlapping periods of time. These people never meet, and general...
Why does sudo change the PATH?
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it's annoying. period. if it could 'get you trojaned' by sudo it could get you trojaned the same without it. granted, harder, but if you are running code from the wrong place even with your regular user, then things are already bad enough.
– gcb
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SQL Server reports 'Invalid column name', but the column is present and the query works through mana
I've hit a bit of an impasse. I have a query that is generated by some C# code. The query works fine in Microsoft SQL Server Management Studio when run against the same database.
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Is the != check thread safe?
...blic boolean test() {
return a != a;
}
may produce true. This is the bytecode for test()
ALOAD 0
GETFIELD test/Test1.a : Ljava/lang/Object;
ALOAD 0
GETFIELD test/Test1.a : Ljava/lang/Object;
IF_ACMPEQ L1
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as we can see it loads field a to local vars twice, it's a non...
What is the difference between a port and a socket?
This was a question raised by one of the software engineers in my organisation. I'm interested in the broadest definition.
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Selenium wait until document is ready
...ed solution only waits for DOM readyState to signal complete. But Selenium by default tries to wait for those (and a little bit more) on page loads via the driver.get() and element.click() methods. They are already blocking, they wait for the page to fully load and those should be working ok.
Probl...
For i = 0, why is (i += i++) equal to 0?
...is invoked with the saved value of x as its argument.
The value returned by the operator is stored in the location given by the evaluation of x.
The saved value of x becomes the result of the operation.
Note that due to order of precedence, the postfix ++ occurs before +=, but the result...
How to specify a editor to open crontab file? “export EDITOR=vi” does not work
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If the crontab is managed by several persons with one user, I recommend to do this in a subshell, so the default editor stays in place.
– Thomas Böhm
Dec 7 '17 at 12:21
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How does the Windows Command Interpreter (CMD.EXE) parse scripts?
...d build a cached command block: This is a complex process that is affected by things such as quotes, special characters, token delimiters, and caret escapes.
Phase 3) Echo the parsed command(s) Only if the command block did not begin with @, and ECHO was ON at the start of the preceding step.
Phas...
How to select an element by classname using jqLite?
... heavy use of find('#id') and find ('.classname'), which are not supported by jqLite, only 'tag names' (as per documentation)
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