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How do I check (at runtime) if one class is a subclass of another?
...dingly.
– Omegaman
Mar 18 '14 at 17:51
28
Subclass testing makes unit testing of many things, par...
Sort array of objects by string property value
...properties starting with a "-" (extremely unlikely and probably not a good idea), you'll need to modify the dynamicSort function to use something else as a reverse sort indicator.
– Ege Özcan
Jan 10 '13 at 15:18
...
Do I need to explicitly call the base virtual destructor?
... cout<<"D destructor"<<endl;
}
};
When you do:
B *pD = new D();
delete pD;
Then if you did not have a virtual destructor in B, only ~B() would be called. But since you have a virtual destructor, first ~D() will be called, then ~B().
...
How do I remove packages installed with Python's easy_install?
Python's easy_install makes installing new packages extremely convenient. However, as far as I can tell, it doesn't implement the other common features of a dependency manager - listing and removing installed packages.
...
How to get current working directory in Java?
...sspath so that you can use ClassLoader#getResource()
File classpathRoot = new File(classLoader.getResource("").getPath());
File[] csvFiles = classpathRoot.listFiles(new FilenameFilter() {
@Override public boolean accept(File dir, String name) {
return name.endsWith(".csv");
}
});
...
How to use if-else option in JSTL
...
Menuka Ishan
2,8013636 silver badges5151 bronze badges
answered Nov 30 '14 at 20:51
user1418225user1418225
...
How do I convert a PDF document to a preview image in PHP? [closed]
...
You need ImageMagick and GhostScript
<?php
$im = new imagick('file.pdf[0]');
$im->setImageFormat('jpg');
header('Content-Type: image/jpeg');
echo $im;
?>
The [0] means page 1.
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...
Powershell v3 Invoke-WebRequest HTTPS error
...ed for me:
http://connect.microsoft.com/PowerShell/feedback/details/419466/new-webserviceproxy-needs-force-parameter-to-ignore-ssl-errors
Basically, in your PowerShell script:
add-type @"
using System.Net;
using System.Security.Cryptography.X509Certificates;
public class TrustAllCertsP...
How to get the Android device's primary e-mail address
...er<Cursor> onCreateLoader(int id, Bundle arguments) {
return new CursorLoader(this,
// Retrieve data rows for the device user's 'profile' contact.
Uri.withAppendedPath(
ContactsContract.Profile.CONTENT_URI,
...
“Insert if not exists” statement in SQLite
...
What is the optimal way to then get the ID of the newly inserted row or the already existing one, so I can insert it to another table that has a foreign key to this one? e.g. I have two tables person (id, name unique) and cat (person_id, name unique) and I want to insert lo...