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Xcode doesn't show the line that causes a crash
...and you are certain you are using the libraries correctly, then you should file a bug report to the maintainers of those libraries.
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How many Activities vs Fragments?
...ies, but it usually pays off. It means that you can use alternative layout files that define different fragment combinations, keep fragment code modular, simplify action bar management, and let the system handle all the back stack work.
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Does use of final keyword in Java improve the performance?
...tion is a technique in which lines of code are not compiled into the class file based on a particular condition. This can be used to remove tons of debugging code in a production build.
consider the following:
public class ConditionalCompile {
private final static boolean doSomething= false;
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What is the preferred/idiomatic way to insert into a map?
... system("pause");
}
This gives respectively for the versions (I ran the file 3 times, hence the 3 consecutive time differences for each):
map_W.insert(std::pair<int,Widget>(it,Widget(2.0)));
2198 ms, 2078 ms, 2072 ms
map_W_2.insert(std::make_pair(it,Widget(2.0)));
2290 ms, 2037 ms, 20...
How to create module-wide variables in Python? [duplicate]
...o do to make a module-global variable is just assign to a name.
Imagine a file called foo.py, containing this single line:
X = 1
Now imagine you import it.
import foo
print(foo.X) # prints 1
However, let's suppose you want to use one of your module-scope variables as a global inside a functi...
Override devise registrations controller
...This will create devise views in views/users folder
now in your route.rb file
devise_for :users, controllers: {
:sessions => "users/sessions",
:registrations => "users/registrations" }
You can add other controllers too. This will make devise to use controllers in use...
To Workflow or Not to Workflow?
...nd/or business rules can change. WF allows to isolate workflow in separate file and so making it configurable by users will be simpler.
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Python (and Python C API): __new__ versus __init__
...ill not get called. One example is when you unpickle objects from a pickle file, they will get allocated (__new__) but not initialised (__init__).
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Understanding implicit in Scala
...n the body of x method the method-signature l's implicit argument value is filed by the x method's local implicit variable(parameter) a implicitly.
So
def x(implicit a:Int)= l
will be in compiler like this
def x(implicit a:Int)= l(a)
Another example:
def c(implicit k:Int):String = k.toString
def...
MyISAM versus InnoDB [closed]
...nges, it records the data before the transactions into a system tablespace file called ibdata1. If there is a crash, InnoDB would autorecover through the replay of those logs.
FULLTEXT Indexing
InnoDB does not support FULLTEXT indexing until MySQL version 5.6.4. As of the writing of this post, man...