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How do I implement an Objective-C singleton that is compatible with ARC?
...redInstance
{
static MyClass *sharedInstance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedInstance = [[MyClass alloc] init];
// Do any other initialisation stuff here
});
return sharedInstance;
}
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How to generate a random int in C?
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int r = rand(); // Returns a pseudo-random integer between 0 and RAND_MAX.
Edit: On Linux, you might prefer to use random and srandom.
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Why should the copy constructor accept its parameter by reference in C++?
...dited Jun 21 '12 at 8:10
someone_ smiley
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answered Apr 21 '10 at 19:14
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Join vs. sub-query
... to distinguish the two. (also the 'very rare' really depends on your data/app).
– Unreason
May 28 '10 at 9:48
21
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In c++ what does a tilde “~” before a function name signify?
...explicitly deleted.
See https://www.ibm.com/support/knowledgecenter/en/ssw_ibm_i_74/rzarg/cplr380.htm
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rmagick gem install “Can't find Magick-config”
... PATH variable with additional path to ImageMagick lib.
PATH="/usr/lib/x86_64-linux-gnu/ImageMagick-6.8.9/bin-Q16:$PATH"
then run gem install rmagick
source of solution
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How to perform a mysqldump without a password prompt?
... the config file via --defaults-file. Like ` mysqldump --defaults-file=my_other.cnf --print-defaults`
– dennis
Jul 23 '13 at 12:46
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How to ignore xargs commands if stdin input is empty?
... -L <#lines>, -n <#args>, -i, and -I <string>:
ls /empty_dir/ | xargs -n10 chown root # chown executed every 10 args or fewer
ls /empty_dir/ | xargs -L10 chown root # chown executed every 10 lines or fewer
ls /empty_dir/ | xargs -i cp {} {}.bak # every {} is replaced with the args...
How SID is different from Service name in Oracle tnsnames.ora
...e as SID
and you can also give it any other
name you want.
SERVICE_NAME is the new feature from
oracle 8i onwards in which database
can register itself with listener. If
database is registered with listener
in this way then you can use
SERVICE_NAME parameter in tnsnames.ora
othe...
Git interactive rebase no commits to pick
I'm on master and I did rebase -i <my_branch>
4 Answers
4
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