大约有 11,460 项符合查询结果（耗时：0.0162秒） [XML]
What's wrong with using $_REQUEST[]?
I've seen a number of posts on here saying not to use the $_REQUEST variable. I usually don't, but sometimes it's convenient. What's wrong with it?
...
Haskell: Lists, Arrays, Vectors, Sequences
...
Lists Rock
By far the most friendly data structure for sequential data in Haskell is the List
data [a] = a:[a] | []
Lists give you ϴ(1) cons and pattern matching. The standard library, and for that matter the prelude, is full of u...
Is there ever a time where using a database 1:1 relationship makes sense?
...zation, and it occurred to me, I cannot think of a time where there should be a 1:1 relationship in a database.
26 Answers
...
How to append rows to an R data frame
I have looked around StackOverflow, but I cannot find a solution specific to my problem, which involves appending rows to an R data frame.
...
multiprocessing.Pool: When to use apply, apply_async or map?
...
Back in the old days of Python, to call a function with arbitrary arguments, you would use apply:
apply(f,args,kwargs)
apply still exists in Python2.7 though not in Python3, and is generally not used anymore. Nowadays,
f...
What is the smallest possible valid PDF?
...imple curiosity, having seen the smallest GIF , what is the smallest possible valid PDF file?
4 Answers
...
When does invoking a member function on a null instance result in undefined behavior?
...
Both (a) and (b) result in undefined behavior. It's always undefined behavior to call a member function through a null pointer. If the function is static, it's technically undefined as well, but there's some dispute.
The f...
How to find time complexity of an algorithm
...For example, lets see how we simplify 2N + 2 machine instructions to describe this as just O(N).
Why do we remove the two 2s ?
We are interested in the performance of the algorithm as N becomes large.
Consider the two terms 2N and 2.
What is the relative influence of these two terms as N become...
CSRF Token necessary when using Stateless(= Sessionless) Authentication?
...
I found some information about CSRF + using no cookies for authentication:
https://auth0.com/blog/2014/01/07/angularjs-authentication-with-cookies-vs-token/
"since you are not relying on cookies, you don't need to protect against cross site requests...
How can I profile C++ code running on Linux?
... you're in a hurry and you can manually interrupt your program under the debugger while it's being subjectively slow, there's a simple way to find performance problems.
Just halt it several times, and each time look at the call stack. If there is some code that is wasting some percentage of the tim...