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What is the advantage of using forwarding references in range-based for loops?
...ider:
#include <vector>
int main()
{
std::vector<bool> v(10);
for (auto& e : v)
e = true;
}
This doesn't compile because rvalue vector<bool>::reference returned from the iterator won't bind to a non-const lvalue reference. But this will work:
#include <...
How to integrate nodeJS + Socket.IO and PHP?
...
131
So, to begin with, I put my project on github, if you want access to the full code: https://gi...
二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...说一下二维码一共有40个尺寸。官方叫版本Version。Version 1是21 x 21的矩阵，Version 2是 25 x 25的矩阵，Version 3是29的尺寸，每增加一个version，就会增加4的尺寸，公式是：(V-1)*4 + 21（V是版本号） 最高Version 40，(40-1)*4+21 = 177，所以最高...
What regular expression will match valid international phone numbers?
...
\+(9[976]\d|8[987530]\d|6[987]\d|5[90]\d|42\d|3[875]\d|
2[98654321]\d|9[8543210]|8[6421]|6[6543210]|5[87654321]|
4[987654310]|3[9643210]|2[70]|7|1)\d{1,14}$
Is the correct format for matching a generic international phone number. I replaced the US land line centric international access c...
What's the difference between a Python “property” and “attribute”?
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189
Properties are a special kind of attribute. Basically, when Python encounters the following c...
What is the 'pythonic' equivalent to the 'fold' function from functional programming?
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119
The Pythonic way of summing an array is using sum. For other purposes, you can sometimes use s...
Difference between rake db:migrate db:reset and db:schema:load
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1328
db:migrate runs (single) migrations that have not run yet.
db:create creates the database
db...