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Unmangling the result of std::type_info::name
... C++11 features, here is how it can be done in C++98, the file type.cpp is now:
#include "type.hpp"
#ifdef __GNUG__
#include <cstdlib>
#include <memory>
#include <cxxabi.h>
struct handle {
char* p;
handle(char* ptr) : p(ptr) { }
~handle() { std::free(p); }
};
std::st...
How do I update/upsert a document in Mongoose?
...
Mongoose now supports this natively with findOneAndUpdate (calls MongoDB findAndModify).
The upsert = true option creates the object if it doesn't exist. defaults to false.
var query = {'username': req.user.username};
req.newData.u...
Get Element value with minidom with Python
..."?! That little nugget cost me 30 minutes of tearing my hair out. I'm bald now. Thanks, minidom.
– Assaf Lavie
Mar 15 '10 at 5:56
10
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Check if a class has a member function of a given signature
...tantiation does not
"do inheritance".
This snag does not affect the well-known SFINAE approach, using "The sizeof() Trick",
for detecting merely whether T has some member function mf (see e.g.
this answer and comments). But
establishing that T::mf exists is often (usually?) not good enough: you may...
Ruby send vs __send__
...th objects of any class, you need to use __send__ to be on the safe side.
Now that leaves the question, why there is send and not just __send__. If there were only __send__ the name send could be used by other classes without any confusion. The reason for that is that send existed first and only la...
UILabel sizeToFit doesn't work with autolayout ios6
...If we run the app in the simulator, sure enough, we see the same thing:
Now, let's select the UILabel in Interface Builder, and take a look at the default settings in the Size inspector:
Note the highlighted constraint above. That is the Content Hugging Priority. As Erica Sadun describes it in...
How to profile a bash shell script slow startup?
...2 2> >(tee /tmp/sample-time.$$.log |
sed -u 's/^.*$/now/' |
date -f - +%s.%N >/tmp/sample-time.$$.tim)
set -x
Doing this will run date only once. There is a quick demo/test to show how it work:
for i in {1..4};do echo now;sleep .05;done| date -f - +%N
...
When should I use nil and NULL in Objective-C?
...
This accepted answer fails to acknowledge that [NSNull null] is a very different beast. To quote from NSNull Class Reference, "The NSNull class defines a singleton object used to represent null values in collection objects (which don’t allow nil values)." ...
How to set environment variables in Python?
...oder It's true for all processes on Unix-like operating systems. I don't know about the other operating system. Note that shell variables are not stored in the environment unless you export them.
– Sven Marnach
Jan 16 '17 at 6:56
...
Email validation using jQuery
...n this regex may need modifying .systems and .poker etc are all valid TLDs now but would fail the regex check
– Liath
Sep 5 '14 at 7:35
3
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