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In which situations do we need to write the __autoreleasing ownership qualifier under ARC?
...
You're right. As the official documentation explains:
__autoreleasing to denote arguments that are passed by reference (id *) and are autoreleased on return.
All of this is very well explained in the ARC transition guide.
In your NSError example, the declaration means __stron...
How to add a 'or' condition in #ifdef
...¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯|//
#ifdef CONDITION_01 //| |//
#define TEMP_MACRO //| |//
#endif //| |//
#ifdef CONDITION_02 //| |//
#define TEMP_MACRO //| |//
#endif ...
Getters \ setters for dummies
...nswer. If you want to use real getters/setters, you would have to use this.__defineGetter__ or the newer Object.defineProperty function.
– Matthew Crumley
Jul 6 '11 at 13:35
1
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Dialog to pick image from gallery or from camera
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It works perfectly, Mario. Thank you so much! I tested it in a Samsung GT-I9100, a LG L7, but it fails when we try to put the image from camera in a Nexus 6 with Android 6. The solution would be adding this to your 58 line in ImagePicker.java: boolean isCamera = (imageRetu...
How to get the IP address of the docker host from inside a docker container
... the parent machine:
sudo ifconfig lo0 alias 192.168.46.49
You can then test the connection from within the docker container with telnet. In my case I wanted to connect to a remote xdebug server:
telnet 192.168.46.49 9000
Now when traffic comes into your Mac addressed for 192.168.46.49 (and al...
mongodb group values by multiple fields
...tems to $push to an array.
db.books.aggregate([
{ "$group": {
"_id": {
"addr": "$addr",
"book": "$book"
},
"bookCount": { "$sum": 1 }
}},
{ "$group": {
"_id": "$_id.addr",
"books": {
"$push": {
...
In Python, how do I indicate I'm overriding a method?
...an think of a better solution please post it here!
def overrides(interface_class):
def overrider(method):
assert(method.__name__ in dir(interface_class))
return method
return overrider
It works as follows:
class MySuperInterface(object):
def my_method(self):
p...
how to change any data type into a string in python
... you're writing your own class and you want str to work for you, add:
def __str__(self):
return "Some descriptive string"
print str(myObj) will call myObj.__str__().
repr is a similar method, which generally produces information on the class info. For most core library object, repr produces ...
ImportError in importing from sklearn: cannot import name check_build
...the kernel's socket connection. Fixed by renaming the file multiprocessing_.py (leading underscore did not work).
– pylang
Jan 11 '19 at 2:52
...
Assign a variable inside a Block to a variable outside a Block
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You need to use this line of code to resolve your problem:
__block Person *aPerson = nil;
For more details, please refer to this tutorial: Blocks and Variables
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