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What does -D_XOPEN_SOURCE do/mean?
...le without this arg. I checked the gcc man page, but did not find this specific option. I did find XOPEN_SOURCE , but there was little explanation of what it does.
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How to close activity and go back to previous activity in android
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You have set android:noHistory = "true" for MainActivity inside AndroidManifest.xml which causes MainActivity to finish automatically on pressing the back key.
OR
Before switching to your 'SettingsActivity', you have called finish() in your MainActivity, which kills it. When you press back button...
How do I access the host machine itself from the iPhone simulator
...arburton no any seperate device will require your computers IPv4 address. (If both devices are not on the same network it's more complicated)
– cameloper
Apr 13 '18 at 10:43
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How to export a mysql database using Command Prompt?
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First check if your command line recognizes mysql command. If not go to command & type in:
set path=c:\wamp\bin\mysql\mysql5.1.36\bin
Then use this command to export your database:
mysqldump -u YourUser -p YourDatabaseName > w...
Onclick javascript to make browser go back to previous page?
...ot be used in production because: 1. JS code should be in dedicated and minified .js files 2. inline JS should be disabled through a Content Security Policy to mitigate XSS injections
– Theophany
Apr 8 at 12:25
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What is the difference between “Class.forName()” and “Class.forName().newInstance()”?
What is the difference between Class.forName() and Class.forName().newInstance() ?
9 Answers
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How to change the decimal separator of DecimalFormat from comma to dot/point?
...e separator either by setting a locale or using the DecimalFormatSymbols.
If you want the grouping separator to be a point, you can use an european locale:
NumberFormat nf = NumberFormat.getNumberInstance(Locale.GERMAN);
DecimalFormat df = (DecimalFormat)nf;
Alternatively you can use the Decimal...
How do I repeat an edit on multiple lines in Vim?
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Thanks. What if i wanted the equivalent of a shift-i? That is, skipping over the initial whitespace?
– saffsd
Dec 10 '08 at 12:49
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Writing to output window of Visual Studio
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Thank you. I assume there is no way to write to output if i start without debugging (ctrl-f5) right?
– previous_developer
Feb 27 '12 at 14:59
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JPA - Returning an auto generated id after persist()
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Yes, there is: unnecessary roundtrip to the database if the transaction ends up being rollbacked, potential exceptions if the persisted entity (or other flushed entities) is not in a valid state yet. A sequence or uuid generator is simpler and more efficient, and doesn't have t...