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Realistic usage of the C99 'restrict' keyword?
...ly thing that accesses the underlying object. It eliminates the potential for pointer aliasing, enabling better optimization by the compiler.
For instance, suppose I have a machine with specialized instructions that can multiply vectors of numbers in memory, and I have the following code:
void Mu...
How does _gaq.push(['_trackPageLoadTime']) work?
...to being an opt-out feature.)
_setSiteSpeedSampleRate is the new function for setting the sample rate on this feature; its default value is 1 (as in 1%). To opt out of using this the Site Speed feature, you have to pass a 0 to this function:
_gaq.push(["_setSiteSpeedSampleRate", 0]);
From the ...
What does $_ mean in PowerShell?
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This is the variable for the current value in the pipe line, which is called $PSItem in Powershell 3 and newer.
1,2,3 | %{ write-host $_ }
or
1,2,3 | %{ write-host $PSItem }
For example in the above code the %{} block is called for ever...
Scala 2.8 breakOut
...t breakOut
So, what's the purpose of breakOut? Consider the example given for the question, You take a list of strings, transform each string into a tuple (Int, String), and then produce a Map out of it. The most obvious way to do that would produce an intermediary List[(Int, String)] collection, a...
Why would you use an ivar?
...the clever people can access and mutate quite easily via the accessors.
Performance
Yes, this can make a difference in some cases. Some programs have constraints where they can not use any objc messaging in certain parts of the program (think realtime). In other cases, you may want to access it dire...
How do I get the path of the Python script I am running in? [duplicate]
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Make a chdir before calling realpath and real path will fail, this is not the answer.
– sorin
Nov 22 '11 at 11:27
7
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Python list subtraction operation
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Use a list comprehension:
[item for item in x if item not in y]
If you want to use the - infix syntax, you can just do:
class MyList(list):
def __init__(self, *args):
super(MyList, self).__init__(args)
def __sub__(self, other):
r...
Is bool a native C type?
...ed). ANSI, as usual, has adopted the ISO C11 standard as an ANSI standard. For historical reasons, the phrase "ANSI C" commonly (but incorrecetly) refers to the language defined by the ANSI C89 / ISO C90 standard. Since C standards are now published by ISO first, and since there have been three ISO ...
Concatenating two lists - difference between '+=' and extend()
...E_ADD.
It's really nothing you should be worrying about, unless you're performing this operation billions of times. It is likely, however, that the bottleneck would lie some place else.
share
|
imp...
Symfony 2 EntityManager injection in service
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For modern reference, in Symfony 2.4+, you cannot name the arguments for the Constructor Injection method anymore. According to the documentation You would pass in:
services:
test.common.userservice:
class: Tes...