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Will writeToFile:atomically: overwrite data?
...r saved in its entirety, or it
fails completely. The atomic write begins by writing the data to a
temporary file. If this write succeeds, then the method moves the
temporary file to its final location.
No one word about checking if file exist.
For example, for method copyItemAtPath:toPath:e...
What is the use case of noop [:] in bash?
...oesn't do anything. In this example the "verbosity" command is turned off by default, by setting it to :. The 'v' option turns it on.
#!/bin/sh
# example
verbosity=:
while getopts v OPT ; do
case $OPT in
v)
verbosit...
Difference between VARCHAR and TEXT in MySQL [duplicate]
...d max size of 65535 characters (you cannot limit the max size)
takes 2 + c bytes of disk space, where c is the length of the stored string.
cannot be (fully) part of an index. One would need to specify a prefix length.
VARCHAR(M)
variable max size of M characters
M needs to be between 1 and 6553...
Understanding $.proxy() in jQuery
...l()
.apply()
If we have a function foobar() we can change the this value by calling:
foobar.call({test: 5});
Now we could access in foobar the object we passed in:
function foobar() {
this.test // === 5
}
This is exactly what jQuery.proxy() does. It takes a function and context (which i...
Set a persistent environment variable from cmd.exe
...t windows machines, but I don't want to be bothered changing them manually by getting on the properties screen of "My Computer"
...
Thread pooling in C++11
...g to Num_Threads, it's better not to create new ones, or destroy old ones (by joining). There will be performance penalty, might even make your application goes slower than the serial version.
Each C++11 thread should be running in their function with an infinite loop, constantly waiting for new ta...
How do you allow spaces to be entered using scanf?
...ith the additional catch that the \n final isn't read; this will be hidden by that fact that most formats start by skipping white spaces, but [ isn't one of them. I don't understand the instance at using scanf to read strings.
– AProgrammer
Aug 9 '09 at 6:09
...
INSERT IF NOT EXISTS ELSE UPDATE?
...on Confliction from new one. In above case all other data will be replaced by new one that is not correct.
– Mrug
Apr 9 '14 at 11:25
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How to get unique values in an array
...that was the kind if geeky javascript-nerd answer that should only be used by someone who understands what it means, and possibly not even then. What it is saying, is that writing if (~a.indexOf(b)) ... is identical to writing the longer if (a.indexOf(b) == -1) ....
– Orwellop...
ScalaTest in sbt: is there a way to run a single test without tags?
I know that a single test can be ran by running, in sbt,
5 Answers
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