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Is it possible to make the -init method private in Objective-C?
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Apple has started using the following in their header files to disable the init constructor:
- (instancetype)init NS_UNAVAILABLE;
This correctly displays as a compiler error in Xcode. Specifically, this is set in several of their He...
How to check if a string is a valid hex color representation?
...he radix (16). This means it could parse strings like 'AAXXCC', because it starts with 'AA'.
Number(), on the other hand, will only parse if the whole string matches the radix. Now, Number() doesn't take a radix parameter, but luckily, you can prefix number literals to get a number in other radii.
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No output to console from a WPF application?
...h the console without it showing on the screen briefly when the program is started, so it kinda looks awkward (but if you can live with it, it works great).
– Alex Paven
Dec 16 '10 at 8:25
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Precise Financial Calculation in JavaScript. What Are the Gotchas?
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Scaling by 100 only helps until you start wanting to do something like calculate percentages (perform division, essentially).
– Pointy
May 8 '18 at 13:05
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Maven: best way of linking custom external JAR to my project?
... jars then you should change the scope from system to compile.
If you are starting with maven I suggest to use maven directly not IDE plugins as it adds an extra layer of complexity.
As for the error, do you put the required jars on your classpath? If you are using types from the library, you need...
How do I configure Notepad++ to use spaces instead of tabs?
...ocumentation is way outdated. The link above points to Tuxfamily, and they started releasing new builds on Tuxfamily back in 2010. The online documentation site on Tuxfamily was published in 2011 and it's for version 5.8.7. Notepad++ is at version 6.5.5 right now, and the "Help Contents" menu option...
Calculate difference between two datetimes in MySQL
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If your start and end datetimes are on different days use TIMEDIFF.
SELECT TIMEDIFF(datetime1,datetime2)
if datetime1 > datetime2 then
SELECT TIMEDIFF("2019-02-20 23:46:00","2019-02-19 23:45:00")
gives: 24:01:00
and datetim...
How to efficiently build a tree from a flat structure?
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realized that if id starts from something big like 1001 then we get index out of bound exception...
– hakan
Feb 21 '17 at 12:53
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Changing variable names in Vim
... will jump to the opposite } thus will select the whole scope.
Press :s/ - start of the substitute command.
<C-R>/ - will insert pattern that match variable name (that name you were on before pressing gd).
/newname/gc<CR> - will initiate search and replace with confirmation on every matc...
Copying PostgreSQL database to another server
...want to resort to a more secure option.
Changes 1, 2, 3 require server restart, change 4 requires reload.
On the target server:
# systemctl stop postgresql@VERSION-NAME
postgres$ pg_basebackup -h SRC_IP -U postgres -D VERSION/NAME --progress
# systemctl start postgresql@VERSION-NAME
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