大约有 40,000 项符合查询结果（耗时：0.0508秒） [XML]
How to initialise memory with new operator in C++?
...ing to get into C++ and I want to pick up some good habits. If I have just allocated an array of type int with the new operator, how can I initialise them all to 0 without looping through them all myself? Should I just use memset ? Is there a “C++” way to do it?
...
How to get instance variables in Python?
Is there a built-in method in Python to get an array of all a class' instance variables? For example, if I have this code:
...
What's better to use in PHP, $array[] = $value or array_push($array, $value)?
...
No benchmarks, but I personally feel like $array[] is cleaner to look at, and honestly splitting hairs over milliseconds is pretty irrelevant unless you plan on appending hundreds of thousands of strings to your array.
Edit: Ran this code:
$t = microti...
Is there a printf converter to print in binary format?
..._PATTERN"\n",
BYTE_TO_BINARY(m>>8), BYTE_TO_BINARY(m));
You need all the extra quotes unfortunately. This approach has the efficiency risks of macros (don't pass a function as the argument to BYTE_TO_BINARY) but avoids the memory issues and multiple invocations of strcat in some of the oth...
how do I check in bash whether a file was created more than x time ago?
...
@Guss right solution is to install coretutils with brew. :-)
– Erik Johansson
Feb 14 '15 at 23:29
1
...
Using logging in multiple modules
I have a small python project that has the following structure -
11 Answers
11
...
Difference between JSONObject and JSONArray
...en dealing with JSON that begins with curly braces. A JSON object is typically used to contain key/value pairs related to one item.
For example: {"name": "item1", "description":"a JSON object"}
Of course, JSON arrays and objects may be nested inside one another. One common example of this is an A...
How to combine two or more querysets in a Django view?
...sets into a list is the simplest approach. If the database will be hit for all querysets anyway (e.g. because the result needs to be sorted), this won't add further cost.
from itertools import chain
result_list = list(chain(page_list, article_list, post_list))
Using itertools.chain is faster than...
Storing images in SQL Server?
I have made a small demo site and on it I am storing images within a image column on the sql server. A few questions I have are...
...
How can I get all the request headers in Django?
I need to get all the Django request headers. From what i've read, Django simply dumps everything into the request.META variable along with a lot aof other data. What would be the best way to get all the headers that the client sent to my Django application?
...