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小心！创业者不可不知的互联网家装惊天伪命题 - 资讯 - 清泛网 - 专注C/C++...
...便能够实时监控到整个装修过程，对于家装过程中出现的问题，用户没有必要前往装修现场，便能够完成对整个装修过程的控制……改变正在悄然发生，虽然这些改变虽然有些机械，但是它们却正在真切地发生着。
而用户也从...
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...
boost自定义composite_key_compare比较函数 - C/C++ - 清泛网 - 专注C/C++及内核技术
...以自定义比较函数。另外，如果调试过程中遇到很奇怪的问题，可以在自定义比较函数中下断点进行调试。
// boost_demo.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include "boost/shared_ptr.hpp"
#include "boost/bimap.hpp"
#in...
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...
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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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...
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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#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...
糯米推全景地图 让竞争对手们如何接招？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...尾巴，创业的热情还异常火爆。那时，我就思考这样一个问题：O2O，尤其是餐饮类O2O，可以凭借一时的补贴吸引顾客，但补贴之后呢？信任感才是最重要的。如何建立信任感，将是O2O未来面临的一大挑战。
2015年7月，正值厨师...