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Why is Scala's immutable Set not covariant in its type?
EDIT : Re-written this question based on original answer
3 Answers
3
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NoClassDefFoundError: android.support.v7.internal.view.menu.MenuBuilder
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In my tests, based on a review of the generated proguard mapping file, this suggested proguard config does not result in obfuscating the MenuBuilder class name, although it does obfuscate SubMenuBuilder.
– Andy Denni...
Django FileField with upload_to determined at runtime
...ation:
In most cases, this object will not have been saved to the database yet, so if it uses the default AutoField, it might not yet have a value for its primary key field.
Therefore the validity of using pk depends on how your particular model is defined.
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How can I run a program from a batch file without leaving the console open after the program starts?
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164
You can use the exit keyword. Here is an example from one of my batch files:
start myProgram.e...
Counting DISTINCT over multiple columns
...were int's (32b) then a "lossless hash" could combine them into an bigint (64b) like Id1 << 32 + Id2.
– crokusek
Jan 31 '14 at 19:35
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Adding VirtualHost fails: Access Forbidden Error 403 (XAMPP) (Windows 7)
...trying to achieve the same thing in MAMP stackoverflow.com/q/40405663/4480164
– cyber8200
Nov 3 '16 at 15:52
ONLY Opti...
Composer Warning: openssl extension is missing. How to enable in WAMP
Trying to install Composer dependency management tool on Win7/64 + WampServer 2.2 via the Setup Installer and I am getting the following message:
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How to read the database table name of a Model instance?
Given a model's instance object, how can I get the database table's name?
1 Answer
1
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How to check if a file exists in Documents folder?
...ist.
NSFileManager Class Reference
Note: Attempting to predicate behavior based on the current state of the file system or a particular file on the file system is not recommended. Doing so can cause odd behavior or race conditions. It's far better to attempt an operation (such as loading a file or ...
How to determine height of UICollectionView with FlowLayout
...to specify any height constraints for the collection view as it would vary based on the contents of the collection view.
Given below is the implementation:
@interface DynamicCollectionView : UICollectionView
@end
@implementation DynamicCollectionView
- (void) layoutSubviews
{
[super layout...