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Useful GCC flags for C
...to catch all kinds of dangling pointers.
http://gcc.gnu.org/wiki/Mudflap_Pointer_Debugging
Here's a demo:
$ cat mf.c
int main()
{
int a[10];
a[10]=1; // <-- o noes, line 4
}
$ gcc -fmudflap mf.c -lmudflap
$ ./a.out
*******
mudflap violation 1 (check/write): time=1280862302.170759 ptr=...
Determine if Python is running inside virtualenv
...t reliable way to check for this is to check whether sys.prefix == sys.base_prefix. If they are equal, you are not in a virtual environment; if they are unequal, you are. Inside a virtual environment, sys.prefix points to the virtual environment, and sys.base_prefix is the prefix of the system Pytho...
How do I show a Save As dialog in WPF?
...w : System.Windows.Forms.IWin32Window
{
private readonly System.IntPtr _handle;
public OldWindow(System.IntPtr handle)
{
_handle = handle;
}
System.IntPtr System.Windows.Forms.IWin32Window.Handle
{
get { return _handle; }
}
}
#endregion
Capitalize() is ...
Python 3.x rounding behavior
...l.Decimal('3.5').quantize(decimal.Decimal('1'),
rounding=decimal.ROUND_HALF_UP)
>>> Decimal('4')
>>> decimal.Decimal('2.5').quantize(decimal.Decimal('1'),
rounding=decimal.ROUND_HALF_EVEN)
>>> Decimal('2')
>>> decimal.Decimal('3.5').quantize(decimal...
How to launch jQuery Fancybox on page load?
..."text/javascript">
$(document).ready(function() {
$("#hidden_link").fancybox().trigger('click');
});
</script>
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Location Services not working in iOS 8
... check whether the user is running iOS 8 or iOS 7. For example:
#define IS_OS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
//In ViewDidLoad
if(IS_OS_8_OR_LATER) {
[self.locationManager requestAlwaysAuthorization];
}
[self.locationManager startUpdatingLocation];
...
Python timedelta in years
...
from dateutil.relativedelta import relativedelta
def yearsago(years, from_date=None):
if from_date is None:
from_date = datetime.now()
return from_date - relativedelta(years=years)
If you'd rather stick with the standard library, the answer is a little more complex::
from dateti...
Why is reading lines from stdin much slower in C++ than Python?
...s to the top of your main, you should see much better performance:
std::ios_base::sync_with_stdio(false);
Normally, when an input stream is buffered, instead of reading one character at a time, the stream will be read in larger chunks. This reduces the number of system calls, which are typically r...
map function for objects (instead of arrays)
... of obj1 sit on the 'prototype' of obj2
console.log(obj2) // Prints: obj2.__proto__ = { 'a': 1, 'b': 2, 'c': 3}
console.log(Object.keys(obj2)); // Prints: an empty Array.
for (key in obj2) {
console.log(key); // Prints: 'a', 'b', 'c'
}
jsbin
However, please do me a favor and av...
MongoDB and “joins” [duplicate]
...is to do it manually, as you have almost described. Just save a document's _id in another document's other_id, then write your own function to resolve the relationship. The other solution is to use DBRefs as described on the manual page above, which will make MongoDB resolve the relationship client-...