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Quickly find whether a value is present in a C array?
I have an embedded application with a time-critical ISR that needs to iterate through an array of size 256 (preferably 1024, but 256 is the minimum) and check if a value matches the arrays contents. A bool will be set to true is this is the case.
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What is the difference between __init__ and __call__?
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The first is used to initialise newly created object, and receives arguments used to do that:
class Foo:
def __init__(self, a, b, c):
# ...
x = Foo(1, 2, 3) # __init__
The second implements function call operator.
class F...
Why do you need ./ (dot-slash) before executable or script name to run it in bash?
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Because on Unix, usually, the current directory is not in $PATH.
When you type a command the shell looks up a list of directories, as specified by the PATH variable. The current directory is not in that list.
The reason for not having the current directory on that list i...
Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?
...me numerical optimization on a scientific application. One thing I noticed is that GCC will optimize the call pow(a,2) by compiling it into a*a , but the call pow(a,6) is not optimized and will actually call the library function pow , which greatly slows down the performance. (In contrast, In...
How to check if a Ruby object is a Boolean
I can't seem to check if an object is a boolean easily. Is there something like this in Ruby?
9 Answers
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How to test if a string is basically an integer in quotes using Ruby
I need a function, is_an_integer , where
20 Answers
20
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Is it possible to get all arguments of a function as single object inside that function?
In PHP there is func_num_args and func_get_args , is there something similar for JavaScript?
10 Answers
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What do Clustered and Non clustered index actually mean?
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With a clustered index the rows are stored physically on the disk in the same order as the index. Therefore, there can be only one clustered index.
With a non clustered index there is a second list that has pointers to the physical rows. You can have many non clustered indices, althoug...
What's an appropriate HTTP status code to return by a REST API service for a validation failure?
...01 Unauthorized whenever I encounter a validation failure in my Django / Piston based REST API application.
Having had a look at the HTTP Status Code Registry
I'm not convinced that this is an appropriate code for a validation failure, what do y'all recommend?
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What does int argc, char *argv[] mean?
...nd compilers, when it generates the main function for you, it looks like this:
8 Answers
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