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How to work with complex numbers in C?
...C? I see there is a complex.h header file, but it doesn't give me much information about how to use it. How to access real and imaginary parts in an efficient way? Is there native functions to get module and phase?
...
Multiple levels of 'collection.defaultdict' in Python
...'t pickle, meaning multiprocessing is unhappy about sending these back and forth.
– Noah
Mar 27 '12 at 16:49
19
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How to automatically generate a stacktrace when my program crashes
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For Linux and I believe Mac OS X, if you're using gcc, or any compiler that uses glibc, you can use the backtrace() functions in execinfo.h to print a stacktrace and exit gracefully when you get a segmentation fault. Documen...
Import a module from a relative path
...ckages (do have the __init__.py file inside them), here is a safe solution for inclusion of modules relatively to the location of the script.
I assume that you want to do this, because you need to include a set of modules with your script. I use this in production in several products and works in m...
How do I detect a click outside an element?
...uld be avoided as it breaks normal event flow in the DOM. See this article for more information. Consider using this method instead
Attach a click event to the document body which closes the window. Attach a separate click event to the container which stops propagation to the document body.
$(win...
`if __name__ == '__main__'` equivalent in Ruby
...
It's handy, though, for testing things -- you can put module tests in there and run them just from the module file without any wrapper.
– ebneter
Feb 12 '10 at 3:11
...
How to validate an e-mail address in swift?
...z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,64}"
let emailPred = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
return emailPred.evaluate(with: email)
}
for versions of Swift earlier than 3.0:
func isValidEmail(email: String) -> Bool {
let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]...
Why is the order in dictionaries and sets arbitrary?
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Note: This answer was written before the implementation of the dict type changed, in Python 3.6. Most of the implementation details in this answer still apply, but the listing order of keys in dictionaries is no longer determined by hash values. The set imp...
List all indexes on ElasticSearch server?
...
For a concise list of all indices in your cluster, call
curl http://localhost:9200/_aliases
this will give you a list of indices and their aliases.
If you want it pretty-printed, add pretty=true:
curl http://localhost:9...
Boost.Asio的简单使用(Timer,Thread,Io_service类) - C/C++ - 清泛网 - 专注C/C++及内核技术
....除了使用boost::array,也可以使用char [] 或std::vector.
for (;;)
{
boost::array<char, 128> buf;
boost::asio::error error;
size_t len = socket.read_some(
boost::asio::buffer(buf), boost::asio::assign_error(error));
当服务器关闭连接时,boost::a...