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Are C# events synchronous?
...stions:
Raising an event does block the thread if the event handlers are all implemented synchronously.
The event handlers are executed sequentially, one after another, in the order they are subscribed to the event.
I too was curious about the internal mechanism of event and its related operatio...
Does Flask support regular expressions in its URL routing?
...randrange
from werkzeug.routing import Rule, Map, BaseConverter, ValidationError
class BooleanConverter(BaseConverter):
def __init__(self, url_map, randomify=False):
super(BooleanConverter, self).__init__(url_map)
self.randomify = randomify
self.regex = '(?:yes|no|maybe...
How do I convert from int to String?
I'm working on a project where all conversions from int to String are done like this:
20 Answers
...
Malloc vs new — different padding
...memory it occupies. So it's hard to see how the difference could result in errors transferring data.
Is there any sign what the author of that comment thinks about objects on the stack or in globals, whether in his opinion they're "padded like malloc" or "padded like new"? That might give clues to ...
find() with nil when there are no records
...in
user = User.find(10)
rescue ActiveRecord::RecordNotFound
puts "some error msg"
end
If you want to recover from the error in the rescue block (e.g. by setting a placeholder user (null pattern)), you can continue with your code below this block. Otherwise you might just put all your code for ...
What is the use of static constructors?
...required configuration data into readonly fields, etc.
It is run automatically by the runtime the first time it is needed (the exact rules there are complicated (see "beforefieldinit"), and changed subtly between CLR2 and CLR4). Unless you abuse reflection, it is guaranteed to run at most once (eve...
What is the proper way to re-throw an exception in C#? [duplicate]
...ew Exception ("Put more context here", ex)
}
This preserves the original error, but allows you to put more context, such as an object ID, a connection string, stuff like that. Often my exception reporting tool will have 5 chained exceptions to report, each reporting more detail.
...
How to make a variadic macro (variable number of arguments)
...
The reason for ## before VA_ARGS is that it swallows the preceding comma in case the variable-argument list is empty, eg. FOO("a") expands to printf("a"). This is an extension of gcc (and vc++, maybe), C99 requires at least one argument to be present in place of the elli...
How do I list all tables in a schema in Oracle SQL?
...with statements like DROP TABLE REALLY_A_VIEW CASCADE CONSTRAINTS throwing errors. So you'd either have to remove the views with MINUS / NOT IN / NOT EXISTS or go agains %_OBJECTS. Plus, going against %_OBJECTS leaves a tantalizing hint of what else might be in there!
– Adam ...
Specifying and saving a figure with exact size in pixels
...ion of image data as it would introduce unknown and unpredictable noise or errors. For example, here is a snippet from a 480x480 image saved via pyplot.savefig():
Detail of pixels which matplotlib resampled to be roughly 2x2, but notice the column of 1x2 pixels
You can see that most pixels were simp...