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__attribute__ - C/C++ - 清泛网 - 专注C/C++及内核技术
...该属性可以避免出现错误信息。C库函数中的abort（）和exit（）的声明格式就采用了这种格式，如下所示：
extern void exit(int) __attribute__((noreturn));extern void abort(void) __attribute__((noreturn)); 为了方便理解，大家可以参考如下的例...
How do I detect whether a Python variable is a function?
I have a variable, x , and I want to know whether it is pointing to a function or not.
25 Answers
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How do I get list of methods in a Python class?
I want to iterate through the methods in a class, or handle class or instance objects differently based on the methods present. How do I get a list of class methods?
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Split views.py in several files
My views.py has become too big and it's hard to find the right view.
10 Answers
10
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Format date and time in a Windows batch script
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I ended up with this script:
set hour=%time:~0,2%
if "%hour:~0,1%" == " " set hour=0%hour:~1,1%
echo hour=%hour%
set min=%time:~3,2%
if "%min:~0,1%" == " " set min=0%min:~1,1%
echo min=%min%
set secs=%time:~6,2%
if "%secs:~0,1%" == " " ...
BaseException.message deprecated in Python 2.6
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Solution - almost no coding needed
Just inherit your exception class from Exception and pass the message as the first parameter to the constructor
Example:
class MyException(Exception):
"""My documentation"""
try:
raise MyException('my detailed description')
ex...
How do you validate a URL with a regular expression in Python?
...e almost anything is a valid URL. There are some punctuation rules for splitting it up. Absent any punctuation, you still have a valid URL.
Check the RFC carefully and see if you can construct an "invalid" URL. The rules are very flexible.
For example ::::: is a valid URL. The path is ":::::...
Determine the type of an object?
...t, dictionary, or something else? I am getting an object back that may be either type and I need to be able to tell the difference.
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Is errno thread-safe?
...h , this variable is declared as extern int errno; so my question is, is it safe to check errno value after some calls or use perror() in multi-threaded code. Is this a thread safe variable? If not, then whats the alternative ?
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Best practices for circular shift (rotate) operations in C++
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See also an earlier version of this answer on another rotate question with some more details about what asm gcc/clang produce for x86.
The most compiler-friendly way to express a rotate in C and C++ that avoids any Undefined Behaviour seems to be John Regehr's implementation. I've adapted it t...