大约有 10,900 项符合查询结果（耗时：0.0243秒） [XML]
What does |= (single pipe equal) and &=(single ampersand equal) mean
...o
x = x | y;
and the same for &. There's a bit more detail in a few cases regarding an implicit cast, and the target variable is only evaluated once, but that's basically the gist of it.
In terms of the non-compound operators, & is a bitwise "AND" and | is a bitwise "OR".
EDIT: In this ...
Convert numpy array to tuple
...
This is pretty common in python because of the concept of "duck-typing" and EAFT, more here: docs.python.org/glossary.html#term-duck-typing. The advantage of this approach is that it'll convert any nested sequence into nested tuples, not just an array. One th...
How to create a loop in bash that is waiting for a webserver to respond?
...
I had a specific case where using --head always returned 405. Had to remove it to make it work
– Ron Harlev
Jul 8 at 1:28
...
What's the difference between the build and create methods in FactoryGirl?
...ting to DB makes testing time consuming.
e.g.
I create users to authentication with create() because my authentication engine queries the DB.
To check if a model has an attribute the build() method will do because no DB access is required.
it{Factory.build(:user).should respond_to(:name)}
Upd...
How long is the SHA256 hash?
...
A sha256 is 256 bits long -- as its name indicates.
Since sha256 returns a hexadecimal representation, 4 bits are enough to encode each character (instead of 8, like for ASCII), so 256 bits would represent 64 hex characters, therefore you need a varchar(64), or even a ...
initializing a boolean array in java
... based. The freq[Global.iParameter[2]] = false; line as you've there would cause ArrayIndexOutOfBoundsException. To learn more about arrays in Java, consult this basic Oracle tutorial.
share
|
impro...
NSLog/printf specifier for NSInteger?
...
Updated answer:
You can make use of the z and t modifiers to handle NSInteger and NSUInteger without warnings, on all architectures.
You want to use %zd for signed, %tu for unsigned, and %tx for hex.
This information comes courtesy of Greg Par...
How to “pull” from a local branch into another one?
This sounds so simple, but I just can't figure it out. I made an experimental branch a while ago, and now I'd like to pull in all the changes that happened on master since I made it. This is all local. I want to pull from local master into local my_branch, but I can't do it. This doesn't seem to wor...
List Git aliases
...es, append | sort just before the closing double-quote. Alternatively, you can keep the aliases in ~/.gitconfig sorted.
To add the alias as a system-wide alias, replace --global (for current user) with --system (for all users). This typically goes in the /etc/gitconfig file.
...
UITableView with fixed section headers
...le. It is recommended that you use initWithStyle:UITableViewStylePlain, as calling something like tableView.style = UITableViewStylePlain will not work.
– bachonk
Jun 10 '14 at 16:35
...