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What should my Objective-C singleton look like? [closed]
...tances of the singleton and attempt to CAS it into position. Whichever one wins the CAS returns immediately, whichever one loses releases the instance it just allocated and returns the (now set) sharedInstance. The single OSAtomicCompareAndSwapPtrBarrier acts as both a write barrier for the setting ...
Setting href attribute at runtime
...lement.attr() function in jQuery.
To get the href attribute, use the following code:
var a_href = $('selector').attr('href');
To set the href attribute, use the following code:
$('selector').attr('href','http://example.com');
In both cases, please use the appropriate selector. If you have set...
What’s the difference between “Array()” and “[]” while declaring a JavaScript array?
...They're the same!". Unfortunately you can't guarantee that.
Take the following example:
function Array() {
this.is = 'SPARTA';
}
var a = new Array();
var b = [];
alert(a.is); // => 'SPARTA'
alert(b.is); // => undefined
a.push('Woa'); // => TypeError: a.push is not a function
b.pus...
Explanation of JSONB introduced by PostgreSQL
...storage «as is»
jsonb: no whitespaces
jsonb: no duplicate keys, last key win
jsonb: keys are sorted
More in speech video and slide show presentation by jsonb developers. Also they introduced JsQuery, pg.extension provides powerful jsonb query language
...
Make a Bash alias that takes a parameter?
... they may contain spaces), and \"\$@\" looks even uglier, but may help you win an obfuscation contest where frazzled hair is a prerequisite for entry.
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How to not run an example using roxygen2?
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this doesn't work for me (running on Win 10, 64 bit, R version 3.5.0)
– JBJ
Apr 26 '19 at 9:59
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Merge PDF files
...
f.close()
if __name__ == '__main__':
if sys.platform == "win32":
import os, msvcrt
msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
pdf_cat(sys.argv[1:], sys.stdout)
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Download file from web in Python 3
... @Corey: Right from the docs: "21.6.24. Legacy interface The following functions and classes are ported from the Python 2 module urllib (as opposed to urllib2). They might become deprecated at some point in the future." ...and I agree on Oleh's "not sure why"
– cfi
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.NET console application as Windows service
I have console application and would like to run it as Windows service. VS2010 has project template which allow to attach console project and build Windows service.
I would like to not add separated service project and if possible integrate service code into console application to keep console appl...
CMake: Print out all accessible variables in a script
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Using the get_cmake_property function, the following loop will print out all CMake variables defined and their values:
get_cmake_property(_variableNames VARIABLES)
list (SORT _variableNames)
foreach (_variableName ${_variableNames})
message(STATUS "${_variableName}=${...