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Why isn't there a Guid.IsNullOrEmpty() method
...why Guid in .NET does not have IsNullOrEmpty() method (where empty means all zeros)
6 Answers
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RAII and smart pointers in C++
.... This has two drawbacks - firstly, wherever we use File, we will have to called File::close() - if we forget to do this, we're holding onto the file longer than we need to. The second problem is what if an exception is thrown before we close the file?
Java solves the second problem using a finally...
Polymorphism in C++
...ecific code selected?
Run time means the compiler must generate code for all the types the program might handle while running, and at run-time the correct code is selected (virtual dispatch)
Compile time means the choice of type-specific code is made during compilation. A consequence of this: say...
Determine if 2 lists have the same elements, regardless of order? [duplicate]
... helper function. Note that it will be quite slow (O(n²)) and should generally not be used outside of the esoteric case of unhashable and unsortable elements.
def equal_ignore_order(a, b):
""" Use only when elements are neither hashable nor sortable! """
unmatched = list(b)
for element...
JUnit: how to avoid “no runnable methods” in test utils classes
I have switched to JUnit4.4 from JUnit3.8. I run my tests using ant, all my tests run successfully but test utility classes fail with "No runnable methods" error. The pattern I am using is to include all classes with name *Test* under test folder.
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Find method references in Xcode
Is there a way in Xcode to find all the places where a method or property has been been called?
6 Answers
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Null coalescing in powershell
...t the Powershell versions involving functions/aliases will always evaluate all arguments. If this is a problem, use the if expression form.
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When to use an object instance variable versus passing an argument to the method
...sus simply declaring them as object instance variables that are visible to all of the object's methods?
5 Answers
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Is there a way to make HTML5 video fullscreen?
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HTML 5 provides no way to make a video fullscreen, but the parallel Fullscreen specification supplies the requestFullScreen method which allows arbitrary elements (including <video> elements) to be made fullscreen.
It has experimental support in a number of browsers.
Original ...
How to execute shell command in Javascript
...Except for one thing. You'll get the error "child is not a function". The call to exec() executes the command - no need to call child(). Unfortunately, the callback isn't called whenever the child process has something to output - it is called only when the child process exits. Sometimes that's OK a...