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Does the 'mutable' keyword have any purpose other than allowing the variable to be modified by a con
...".
Without the mutable keyword you will eventually be forced to use const_cast to handle the various useful special cases it allows (caching, ref counting, debug data, etc.). Unfortunately const_cast is significantly more destructive than mutable because it forces the API client to destroy the con...
How to normalize a path in PowerShell?
... $PSCmdlet.SessionState.Path.GetUnresolvedProviderPathFromPSPath($_)
}
}
}
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How to copy files across computers using SSH and MAC OS X Terminal [closed]
...compression use SCP:
scp username@yourserver.com:~/serverpath/public_html ~/Desktop
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How do you find the row count for all your tables in Postgres
...vy activity, but is generally a good estimate:
SELECT schemaname,relname,n_live_tup
FROM pg_stat_user_tables
ORDER BY n_live_tup DESC;
That can also show you how many rows are dead, which is itself an interesting number to monitor.
The third way is to note that the system ANALYZE command, ...
How to edit log message already committed in Subversion?
...t modify a remote
repository using this command.
$ svnadmin setlog REPOS_PATH -r N FILE
where REPOS_PATH is the repository
location, N is the revision number
whose log message you wish to change,
and FILE is a file containing the new
log message. If the
"pre-revprop-change" hook i...
Why does this async action hang?
...lock? Imagine you just have this code:
var task = dataSource.ExecuteAsync(_ => 42);
var result = task.Result;
So the first line kicks off the asynchronous work. The second line then blocks the UI thread. So when the runtime wants to run the "return result" line back on the UI thread, it can't ...
How to get current moment in ISO 8601 format with date, hour, and minute?
...ad safe.
ZonedDateTime.now( ZoneOffset.UTC ).format( DateTimeFormatter.ISO_INSTANT )
Result: 2015-04-14T11:07:36.639Z
You may be tempted to use lighter Temporal such as Instant or LocalDateTime,
but they lacks formatter support or time zone data.
Only ZonedDateTime works out of the box.
...
lsof survival guide [closed]
... Source: danielmiessler.com/study/lsof
– Uphill_ What '1
Oct 20 '14 at 7:34
One good way is to use the cheat gem...
What is the purpose of wrapping whole Javascript files in anonymous functions like “(function(){ … }
...ave private methods/functions and properties:
(function() {
var private_var;
function private_function() {
//code
}
})();
In the first example, you would explicitly invoke globalFunction by name to run it. That is, you would just do globalFunction() to run it. But in the above exam...
Checking network connection
...
Perhaps you could use something like this:
import urllib2
def internet_on():
try:
urllib2.urlopen('http://216.58.192.142', timeout=1)
return True
except urllib2.URLError as err:
return False
Currently, 216.58.192.142 is one of the IP addresses for google.com. ...