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What is the email subject length limit?
...255 is probably the most common (and more efficient) data column length in MySQL / MariaDB. Bytes are most certainly still relevant. MySQL will use 1 byte to store the length if it is less than 256, or more otherwise. Take a look at how C++ implements std::string if you think string lengths aren'...
John Carmack's Unusual Fast Inverse Square Root (Quake III)
... function in the Quake III source code which calculates the inverse square root of a float, 4x faster than regular (float)(1.0/sqrt(x)) , including a strange 0x5f3759df constant. See the code below. Can someone explain line by line what exactly is going on here and why this works so much faster t...
请停下来重新想下 你究竟为何创业？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...扯？这里不应该是创业成功者的鸡汤分享区么？比如你是如何拿到几亿美元的风投，或者起码要秀一下融资的雄心壮志吧？毕竟哪个心智正常的人会花费十几年的时间经营公司，却连想要吞并别人的野心都没有。
唔，我之所以...
When should you use a class vs a struct in C++?
... class that has no non-static data members of type non-POD-struct, non-POD-union (or array of such types) or reference, and has no user-defined copy assignment operator and no user-defined destructor." There is no restriction on using the "struct" class-key and no restriction on using "public" (see...
Change SVN repository URL
...h://192.168.0.20/var/svn-repos/myrepo' where id=1; check your value with select * from REPOSITORY;
– Samuel
Sep 8 at 0:28
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Python executable not finding libpython shared library
...ce configure directives to handle alternate library paths (not everyone is root you know...) In the simplest case all you need is the following:
./configure --enable-shared \
--prefix=/usr/local \
LDFLAGS="-Wl,--rpath=/usr/local/lib"
Or if you prefer the non-linux version...
分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...将是一个灾难性的失败。 这个思维实验就包括考虑他们如何去做这件事情。下面是我们的思考：
1）第一位将军先发送一段消息“让我们在上午9点开始进攻”。然而，一旦信使被派遣，他是否通过了山谷，第一位将军就不得而...
Command not found when using sudo
...un a command using sudo you are effectively running it as the superuser or root.
The reason that the root user is not finding your command is likely that the PATH environment variable for root does not include the directory where foo.sh is located. Hence the command is not found.
The PATH enviro...
in_array multiple values
... developer, you should probably start learning set operations (difference, union, intersection). You can imagine your array as one "set", and the keys you are searching for the other.
Check if ALL needles exist
function in_array_all($needles, $haystack) {
return empty(array_diff($needles, $hays...
Can I specify multiple users for myself in .gitconfig?
... an arbitrary number of IDs inside a configfile (~/.gitpassport) which are selectable on a prompt. You can find the project at github.com: git-passport - A Git command and hook written in Python to manage multiple Git accounts / user identities.
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