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What's the scope of a variable initialized in an if statement?
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Scope in python follows this order:
Search the local scope
Search the scope of any enclosing functions
Search the global scope
Search the built-ins
(source)
Notice that if and other looping/branching constructs are not listed - only classes, functio...
Is there a TRY CATCH command in Bash
... set the -e flag). Programming languages which offer try/catch do this in order to inhibit a "bailing out" because of this special situation (hence typically called
How do I list the symbols in a .so file
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Try adding -l to the nm flags in order to get the source of each symbol. If the library is compiled with debugging info (gcc -g) this should be the source file and line number. As Konrad said, the object file / static library is probably unknown at this po...
Call one constructor from another
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May I know the execution order of this one? Everything in Sample(string) will be executed first then Sample(int) or the int version will be executed first then it will get back to the string version? (Like calling super() in Java?)
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Is there a simple way to convert C++ enum to string?
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What I tend to do is create a C array with the names in the same order and position as the enum values.
eg.
enum colours { red, green, blue };
const char *colour_names[] = { "red", "green", "blue" };
then you can use the array in places where you want a human-readable value, eg
colour...
Adding placeholder text to textbox
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Instead of handling the focus enter and focus leave events in order to set and remove the placeholder text it is possible to use the Windows SendMessage function to send EM_SETCUEBANNER message to our textbox to do the work for us.
This can be done with two easy steps. First we need t...
Odd behavior when Java converts int to byte?
...two's complement representation the sign bit can be copied on the right in order to add bits. It's easy to understand it thinking to the rule of how to obtain the negative of a number. that is: consider all the bits from right to left and write them unchanged till the first 1 comprised. Then invert ...
How to parse XML to R data frame
...e:
require(XML)
data <- xmlParse("http://forecast.weather.gov/MapClick.php?lat=29.803&lon=-82.411&FcstType=digitalDWML")
xml_data <- xmlToList(data)
In the case of your example data, getting location and start time is fairly straightforward:
location <- as.list(xml_data[["data"...
What are good uses for Python3's “Function Annotations”
... The __annotations__ is a dict that does not ensure arguments order, so this snippet sometimes fail. I would recommend changing the types = tuple(...) to spec = inspect.getfullargspec(function) then types = tuple([spec.annotations[x] for x in spec.args]).
– xoolive...
Given a view, how do I get its viewController?
...ne point, a view has only one view controller. Being able to get to it in order to pass a message back to it, should be an automatic feature, not one where you have to work to achieve (by adding a property to keep track). One could say the same thing about views: why do you need to know who child...