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What is the volatile keyword useful for?
...
volatile has semantics for memory visibility. Basically, the value of a volatile field becomes visible to all readers (other threads in particular) after a write operation completes on it. Without volatile, readers could see some non-updated value.
To answer your question: Y...
What is the JavaScript convention for no operation?
... "function" // returns true
It can be invoked as a function and essentially does nothing as shown here:
setTimeout(function() {
console.log('Start: ', Date.now());
Function.prototype();
console.log('End : ', Date.now());
}, 1000);
Although this is a "true noop" since...
#pragma pack effect
...alks about some fairly extreme alignment (aligning on 4KB boundaries). The CPU expects certain minimum alignments for various data types, but those require, in the worst case, 8-byte alignment (not counting vector types which may require 16 or 32 byte alignment). Not aligning on those boundaries gen...
Is “double hashing” a password less secure than just hashing it once?
...o compute a hash for each password and see if it matches the stored hash.
All passwords are not equally likely. Attackers might exhaustively search all short passwords, but they know that their chances for brute-force success drop sharply with each additional character. Instead, they use an ordered...
Measure and Benchmark Time for Ruby Methods
... :001 > foo
5.230000 0.020000 5.250000 ( 5.274806)
Values are: cpu time, system time, total and real elapsed time.
Source: ruby docs.
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ImageView 扩展：图片查看器扩展，支持缩放、双击缩放和动画缩放 · App In...
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手势识别
图片加载
常见问题
Q: 如何设置初始缩放比例？
Q: 支持哪些图片格式？
Q: 如何处理图片加载失败？
Q: 缩放操作会影响性能吗？
Q: 可以同时使...
Quick and easy file dialog in Python?
...t hangs. I'm still able to type in the terminal, but nothing happens. Also cpu goes to 0% for my program. Any advice?
– Diana
Jul 2 '13 at 20:00
17
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Sharing a result queue among several processes
...iprocessing import Pool
def busy_foo(i):
"""Dummy function simulating cpu-bound work."""
for _ in range(int(10e6)): # do stuff
pass
return i
if __name__ == '__main__':
with Pool(4) as pool:
print(pool._outqueue) # DEMO
results = [pool.apply_async(busy_foo...
C语言结构体里的成员数组和指针 - c++1y / stl - 清泛IT社区，为创新赋能！
...问0x4的内存地址，不crash才怪。于是，你一定会有如下的问题：1）为什么不是 13行if语句出错？f.a被初始化为空了嘛，用空指针访问成员变量为什么不crash？2）为什么会访问到了0x4的地址？靠，4是怎么出来的？3）代码中的第4行...
CSS: Animation vs. Transition
...ed, or vice versa.
If you want to perform something that does not specifically involve a start state and an end state, or you need more fine grain control over the keyframes in a transition, then you've got to use an animation.
...