大约有 37,000 项符合查询结果（耗时：0.0461秒） [XML]
What is the difference between LL and LR parsing?
...to the right and attempt to construct a leftmost derivation. This is done by beginning at the start symbol and repeatedly expanding out the leftmost nonterminal until we arrive at the target string. An LR parse is a left-to-right, rightmost derivation, meaning that we scan from the left to right a...
API Keys vs HTTP Authentication vs OAuth in a RESTful API
...I keys, and even others (including the questions I found here on SO) swear by OAuth.
2 Answers
...
What is the significance of 1/1/1753 in SQL Server?
...rs decided not to allow dates
before 1753. You can store earlier
dates by using character fields, but
you can't use any datetime functions
with the earlier dates that you store
in character fields.
The choice of 1753 does seem somewhat anglocentric however as many catholic countries in E...
What are the differences between various threading synchronization options in C#?
...code. Other threads must wait till the current owner relinquishes the lock by exiting the block of code. Also it is recommended that you lock on a private member object of your class.
Monitors
lock(obj) is implemented internally using a Monitor. You should prefer lock(obj) because it prevents y...
Objective-C ARC: strong vs retain and weak vs assign
There are two new memory management attributes for properties introduced by ARC, strong and weak .
8 Answers
...
What is the most frequent concurrency issue you've encountered in Java? [closed]
...ommon concurrency problem I've seen, is not realizing that a field written by one thread is not guaranteed to be seen by a different thread. A common application of this:
class MyThread extends Thread {
private boolean stop = false;
public void run() {
while(!stop) {
doSomeWork();
...
What does the term “porcelain” mean in Git?
...elain" applies to high-level commands, with output:
meant to be readable by human
not meant to be parsed
susceptible to changes/evolutions
That is key: if you script, you should use if possible plumbing commands, with stable outputs. Not porcelain commands.
However, you can use the output of a ...
What is PostgreSQL explain telling me exactly?
...'s of its child nodes. In the text representation, the tree is represented by indentation, e.g. LIMIT is a parent node and Seq Scan is its child. In the PgAdmin representation, the arrows point from child to parent — the direction of the flow of data — which might be counterintuitive if you are ...
Breaking loop when “warnings()” appear in R
...gs as warnings!
j()
# 1
# 2
# 3
# Warning messages:
# 1: NAs introduced by coercion
# 2: NAs introduced by coercion
# 3: NAs introduced by coercion
# warn = 2 -- warnings as errors
options(warn=2)
j()
# 1
# Error: (converted from warning) NAs introduced by coercion
...
How to avoid having class data shared among instances?
... answered Nov 5 '09 at 13:23
abyxabyx
57.2k1616 gold badges8686 silver badges113113 bronze badges
...