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What is the proper way to test if a parameter is empty in a batch file?
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From IF /?:
If Command Extensions are enabled IF
changes as follows:
IF [/I] string1 compare-op string2 command
IF CMDEXTVERSION number command
IF DEFINED variable command
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The DEFINED conditional work...
What is the logic behind the “using” keyword in C++?
...lement, too confusing, or would contradict old code.
Here is an old paper from 2003 n1449. The rationale seems to be related to templates. Warning: there may be typos due to copying over from PDF.
First let’s consider a toy example:
template <typename T>
class MyAlloc {/*...*/};
template ...
How to get index of object by its property in JavaScript?
... Thanks for explaining @GrayedFox. My reference to greedy was actually from programming too but related to regular expressions where greedy takes more characters than non-greedy! :-)
– Jos
Sep 17 '19 at 12:57
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How exactly does tail recursion work?
...eturn address of the function making the tail call, instead of the address from which the tail call was made.
– Steve Jessop
Mar 20 '13 at 9:59
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python NameError: global name '__file__' is not defined
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But to run file.py from a script, you would put it in the same directory as your script for example. So you need to move to this directory before running file.py... So still something better is sought.
– ztyh
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Use URI builder in Android or create URL with variables
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Excellent answer from above turned into a simple utility method.
private Uri buildURI(String url, Map<String, String> params) {
// build url with parameters.
Uri.Builder builder = Uri.parse(url).buildUpon();
for (Map.Entry...
Difference between open and codecs.open in Python
...he bat, making it much easier to debug.
Pure ASCII "plain text" is a myth from the distant past. Proper English text uses curly quotes, em-dashes, bullets, € (euro signs) and even diaeresis (¨). Don't be naïve! (And let's not forget the Façade design pattern!)
Because pure ASCII is not a rea...
What is the iBeacon Bluetooth Profile
...ns, however, a few hardware developers have reverse Engineered the iBeacon from the AirLocate Sample code and started selling iBeacon dev kits.
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How to do constructor chaining in C#
... in it, you're not repeating yourself, so, for example, if you change Name from a property to an internal field you need only change one constructor - if you'd set that property in all three constructors that would be three places to change it.
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What is the difference between build.sbt and build.scala?
... project settings. But now I have installed giter8 and created a project from template. And generated project from template missed build.sbt file, but it have build.scala (which seems used for same purposes, but it is more flexible).
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