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PHP array_filter with arguments
... $i < $this->num;
}
}
Usage (demo):
$arr = array(7, 8, 9, 10, 11, 12, 13);
$matches = array_filter($arr, array(new LowerThanFilter(12), 'isLower'));
print_r($matches);
As a sidenote, you can now replace LowerThanFilter with a more generic NumericComparisonFilter with methods lik...
What is stack unwinding?
...dling. Here's an example:
void func( int x )
{
char* pleak = new char[1024]; // might be lost => memory leak
std::string s( "hello world" ); // will be properly destructed
if ( x ) throw std::runtime_error( "boom" );
delete [] pleak; // will only get here if x == 0. if x!=0, th...
How to convert a string to an integer in JavaScript?
... simplest way would be to use the native Number function:
var x = Number("1000")
If that doesn't work for you, then there are the parseInt, unary plus, parseFloat with floor, and Math.round methods.
parseInt:
var x = parseInt("1000", 10); // you want to use radix 10
// so you get a decimal ...
Fastest way to convert an iterator to a list
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edited Sep 25 '10 at 18:41
answered Sep 24 '10 at 20:48
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Green Bars in Visual Studio 2010
I am wondering what these greens things are in Visual Studio 2010. What are they for? They look pretty random but of course they have to have some meaning. Can any one tell me?
...
Boolean.hashCode()
...s?
Suppose for a second that we picked composite numbers (non-primes), say 1000 and 2000. When inserting booleans into a hash table, true and false would go into bucket 1000 % N resp 2000 % N (where N is the number of buckets).
Now notice that
1000 % 8 same bucket as 2000 % 8
1000 % 10 same buc...
What does curly brackets in the `var { … } = …` statements do?
...
answered Mar 8 '13 at 10:09
BlenderBlender
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What does T&& (double ampersand) mean in C++11?
...UTION: the linked article on MSDN ("Rvalue References: C++0x Features in VC10, Part 2") is a very clear introduction to Rvalue references, but makes statements about Rvalue references that were once true in the draft C++11 standard, but are not true for the final one! Specifically, it says at variou...
Calling shell functions with xargs
...the function should do it (untested):
export -f echo_var
seq -f "n%04g" 1 100 | xargs -n 1 -P 10 -I {} bash -c 'echo_var "$@"' _ {}
You can use the builtin printf instead of the external seq:
printf "n%04g\n" {1..100} | xargs -n 1 -P 10 -I {} bash -c 'echo_var "$@"' _ {}
Also, using return 0 a...
Usage of sys.stdout.flush() method
...
Haldean BrownHaldean Brown
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