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In C#, what happens when you call an extension method on a null object?
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Addition to the correct answer from Marc Gravell.
You could get a warning from the compiler if it is obvious that the this argument is null:
default(string).MyExtension();
Works well at runtime, but produces the warning "Expression will always cause a ...
The written versions of the logical operators
...d operators, x | y is sufficiently visually distinct (in monospaced fonts) from x || y, but I do find the ! in e.g. if (!f(xyz) && ... easier to miss than if (not f(xyz) && ....
– Tony Delroy
Aug 20 '15 at 6:00
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How do I set the offset for ScrollSpy in Bootstrap?
...d that this method is good, but that if I want to use it to set the offset from the beginning due to having different menu heights the $('body').data().scrollspy.options.offset (or the variant for version 3.0) isn't yet set. Is there something asynchronous about scrollspy that I'm missing?
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What is a mutex?
... a lock request to the OS. When the OS detects that the mutex was released from a thread, it merely gives it to you, and lock() returns - the mutex is now yours and only yours. Nobody else can steal it, because calling lock() will block him. There is also try_lock() that will block and return true w...
What can MATLAB do that R cannot do? [closed]
...se in Matlab. I find that the quality of Matlab documentation varies a lot from function to function and between (commercial) toolboxes. I agree that Matlab IDE is somewhat more beginner friendly, but it is not better than e.g. ESS for R if you use it on a daily bases.
– Matti ...
Where to put include statements, header or source?
...l H file. The internal H file includes the external H file.
You see that from the compilers POV, as it compiles a C file, there is a hierarchy;
external -> internal -> C code
This is the correct ordering, since that which is external is everything a third party needs to use the library. T...
Confused about __str__ on list in Python [duplicate]
Coming from a Java background, I understand that __str__ is something like a Python version of toString (while I do realize that Python is the older language).
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Why are C# 4 optional parameters defined on interface not enforced on implementing class?
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Optional parameters are kind of like a macro substitution from what I understand. They are not really optional from the method's point of view. An artifact of that is the behavior you see where you get different results if you cast to an interface.
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Recommended way to insert elements into map [duplicate]
...cent question - why use at() instead of the [] operator to retrieve values from a vector. Apparently at() throws an exception if the index is out of bounds whereas [] operator doesn't. In these situations it's always best to look up the documentation of the functions as they will give you all the de...
Print string to text file
... @nicorellius, if you wish to use that with Python2.x you need to put from __future__ import print_function at the top of the file. Note that this will transform all of the print statements in the file to the newer function calls.
– John La Rooy
Apr 6 '16 ...