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Concurrent HashSet in .NET Framework?
...even if it is a null reference (the reference needs 4 bytes in a 32-bit runtime and 8 bytes in a 64-bit runtime). Therefore, using a byte, an empty struct, or similar may reduce the memory footprint (or it may not if the runtime aligns the data on native memory boundaries for faster access).
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Why are trailing commas allowed in a list?
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It helps to eliminate a certain kind of bug. It's sometimes clearer to write lists on multiple lines.
But in, later maintenace you may want to rearrange the items.
l1 = [
1,
2,
3,
4,
5
]
# Now you want to rearrange
l1 = [
1,
...
Git authentication fails after enabling 2FA
...thub.com/owner/repo.git
You can persist your password by run this for one time only:
$ git config credential.helper store
and then your future git password(s) will be stored in ~/.git-credentials, in plaintext, using the format https://user:PlaintextPassword@example.com.
Storing password(s) in p...
The function to show current file's full path in mini buffer
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I have the following code already in use for a long time.
It copies the full file path to the kill ring when I press the middle mouse button on the buffer name in the mode-line. It copies just the buffer name to the kill-ring when I press shift-mouse-2 on the buffer-name in th...
SQL-Server: Is there a SQL script that I can use to determine the progress of a SQL Server backup or
...S [Percent Complete],CONVERT(VARCHAR(20),DATEADD(ms,r.estimated_completion_time,GetDate()),20) AS [ETA Completion Time],
CONVERT(NUMERIC(10,2),r.total_elapsed_time/1000.0/60.0) AS [Elapsed Min],
CONVERT(NUMERIC(10,2),r.estimated_completion_time/1000.0/60.0) AS [ETA Min],
CONVERT(NUMERIC(10,2),r.esti...
Programmatically retrieve memory usage on iPhone
I'm trying to retrieve the amount of memory my iPhone app is using at anytime, programmatically. Yes I'm aware about ObjectAlloc/Leaks. I'm not interested in those, only to know if it's possible to write some code and get the amount of bytes being used and report it via NSLog.
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JavaScript seconds to time string with format hh:mm:ss
I want to convert a duration of time, i.e., number of seconds to colon-separated time string (hh:mm:ss)
43 Answers
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Is the practice of returning a C++ reference variable evil?
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In general, returning a reference is perfectly normal and happens all the time.
If you mean:
int& getInt() {
int i;
return i; // DON'T DO THIS.
}
That is all sorts of evil. The stack-allocated i will go away and you are referring to nothing. This is also evil:
int& getInt() {
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Remove all special characters, punctuation and spaces from string
... the provided answers by finding out which executes in the least amount of time, so I went through and checked some of the proposed answers with timeit against two of the example strings:
string1 = 'Special $#! characters spaces 888323'
string2 = 'how much for the maple syrup? $20.99? That s ric...
VS 2010 Test Runner error “The agent process was stopped while the test was running.”
...udio 2010, I have a number of unit tests. When I run multiple tests at one time using test lists, I sometimes reveive the following error for one or more of the tests:
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