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Check if a class has a member function of a given signature
I'm asking for a template trick to detect if a class has a specific member function of a given signature.
16 Answers
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Proper way to return JSON using node or Express
...hat response is a string too, if you want to send the response prettified, for some awkward reason, you could use something like JSON.stringify(anObject, null, 3)
It's important that you set the Content-Type header to application/json, too.
var http = require('http');
var app = http.createServer(fu...
How do I get the real .height() of a overflow: hidden or overflow: scroll div?
...'m aware of .height() and innerHeight() , but none of them does the job for me in this case. The thing is that in this case I have a div that is overflown width a overflow: scroll and the div has a fixed height.
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Xcode doesn't show the line that causes a crash
...caused the crash. In some cases that used to be normal (segmentation fault for example) but the crash I am trying to deal with is a simple SIGABRT with detailed information logged in the console:
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How do I get the base URL with PHP?
...aces, commas, carriage return, etc. Anything that is not a valid character for a domain. Check the PHP builtin parse_url function for an example.
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How to len(generator()) [duplicate]
...o you can use them in loop. But they don't contain any elements, so asking for the length of a generator is like asking for the length of a function.
if functions in Python are objects, couldn't I assign the length to a
variable of this object that would be accessible to the new generator?
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Show current assembly instruction in GDB
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You can switch to assembly layout in GDB:
(gdb) layout asm
See here for more information. The current assembly instruction will be shown in assembler window.
┌──────────────────────────────────────────...
UIPanGestureRecognizer - Only vertical or horizontal
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Just do this for the vertical pan gesture recognizer, it works for me:
- (BOOL)gestureRecognizerShouldBegin:(UIPanGestureRecognizer *)panGestureRecognizer {
CGPoint velocity = [panGestureRecognizer velocityInView:someView];
retur...
How to show all shared libraries used by executables in Linux?
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Use ldd to list shared libraries for each executable.
Cleanup the output
Sort, compute counts, sort by count
To find the answer for all executables in the "/bin" directory:
find /bin -type f -perm /a+x -exec ldd {} \; \
| grep so \
| sed -e '/^[^\t]/ d' \...
Python (and Python C API): __new__ versus __init__
...nt, and (usually) returns a new instance of that type. Thus it is suitable for use with both mutable and immutable types.
__init__ accepts an instance as the first argument and modifies the attributes of that instance. This is inappropriate for an immutable type, as it would allow them to be modifi...