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What is the difference between char * const and const char *?
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The difference is that const char * is a pointer to a const char, while char * const is a constant pointer to a char.
The first, the value being pointed to can't be changed but the pointer can be. The second, the value being pointed at ca...
What's onCreate(Bundle savedInstanceState)
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If you save the state of the application in a bundle (typically non-persistent, dynamic data in onSaveInstanceState), it can be passed back to onCreate if the activity needs to be recreated (e.g., orientation change) so that you don't lose this prior information. If no data was supplied, savedIns...
Extracting bits with a single multiplication
...byte manipulated. Using unsigned 8 bit for simplicity. Imagine your number is xxaxxbxx and you want ab000000.
The solution consisted of two steps: a bit masking, followed by multiplication. The bit mask is a simple AND operation that turns uninteresting bits to zeros. In the above case, your mask w...
What's the best strategy for unit-testing database-driven applications?
...here's an ORM layer separate from the business and presentation logic. This makes unit-testing the business logic fairly straightforward; things can be implemented in discrete modules and any data needed for the test can be faked through object mocking.
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How do I sort strings alphabetically while accounting for value when a string is numeric?
...OrderBy. Enumerable.OrderBy will let you specify any comparer you like.
This is one way to do that:
void Main()
{
string[] things = new string[] { "paul", "bob", "lauren", "007", "90", "101"};
foreach (var thing in things.OrderBy(x => x, new SemiNumericComparer()))
{
Co...
What is the “double tilde” (~~) operator in JavaScript? [duplicate]
I'm seeing this in some code, and I have no idea what it does:
4 Answers
4
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Why does C# not provide the C++ style 'friend' keyword? [closed]
...riend keyword allows a class A to designate class B as its friend. This allows Class B to access the private / protected members of class A .
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Why is “origin/HEAD” shown when running “git branch -r”?
When you run git branch -r why the blazes does it list origin/HEAD ? For example, there's a remote repo on GitHub, say, with two branches: master and awesome-feature. If I do git clone to grab it and then go into my new directory and list the branches, I see this:
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Moving average or running mean
Is there a SciPy function or NumPy function or module for Python that calculates the running mean of a 1D array given a specific window?
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What is the fastest integer division supporting division by zero no matter what the result is?
... movl %edx, %eax
sarl $31, %edx
idivl %ecx
ret
As this turned out to be such a popular question and answer, I'll elaborate a bit more. The above example is based on programming idiom that a compiler recognizes. In the above case a boolean expression is used in integral arithme...