大约有 40,000 项符合查询结果（耗时：0.0547秒） [XML]
What is the difference between self-types and trait subclasses?
...is extended, then you're required to mix-in an A.
When a concrete class finally extends/mixes-in these traits, some class/trait must implement A.
Consider the following examples:
scala> trait User { def name: String }
defined trait User
scala> trait Tweeter {
| user: User =>
...
What is the Python equivalent of static variables inside a function?
...tically more obvious what it does (@static_var("counter", 0) is easier on & makes more sense to my eyes than if "counter" not in foo.__dict__: foo.counter = 0, especially as in the latter you have to use the function name (twice) which might change).
– Claudiu
...
C# 通过代码安装、卸载、启动、停止服务 - .NET(C#) - 清泛IT论坛，有思想、有深度
... (service.Status != System.ServiceProcess.ServiceControllerStatus.Running && service.Status != System.ServiceProcess.ServiceControllerStatus.StartPending)
                    {
          ...
Install tkinter for Python
...stall Tkinter locally to use with system-provided Python. You may build it from sources, but this is usually not the best idea with a binary package-based distro you're apparently running.
It's safer to apt-get install python-tk on your machine(s).
(Works on Debian-derived distributions like for Ub...
Change File Extension Using C#
...locate a file on the disk. Are you sure the file c:\..\..\a.jpg (in your example) is really exists? If yes, maybe you don't have enough priviledges to delete this file? And finally, if you just want to replace file extension use var newFilePath = Path.ChangeExtension(myffile, ".Jpg");; the newFilePa...
How to count duplicate value in an array in javascript
...- it was me; I was browsing on mobile, and have clicked the button w/o actually noticing. Once I found out it was too late to revert. Apologies for that, the answer is really good. If you want to edit it, I'd be glad to reverse.
– Todor Minakov
Jan 19 '19 at 10...
Iteration over std::vector: unsigned vs signed index variable
...your code runs as generic as possible.
Using Range C++11
for(auto const& value: a) {
/* std::cout << value; ... */
Using indices
for(std::vector<int>::size_type i = 0; i != v.size(); i++) {
/* std::cout << v[i]; ... */
}
Using arrays
Using iterators
for(ele...
How to change a module variable from another module?
...rom some_other_module import a as x
is more like the following code in K&R C:
extern int a; /* import from the EXTERN file */
int x = a;
(caveat: in the Python case, "a" and "x" are essentially a reference to the actual value: you're not copying the INT, you're copying the reference addres...
程序员才能听得懂的笑话 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...这个论坛的人都吵起来,我今晚就跟你走. 某软件工程师:PHP是最好的语言! 某论坛炸锅了,各种吵架... 某女:服了你了,我们走吧 你想干啥都行. 某软件工程师:今天不行,我一定要说服他们,PHP必须是最好的语言 某女：....
50、《c++程...
How to write file if parent folder doesn't exist?
...ot exist, it's created. options are what you'd pass to fs.writeFile().
Example:
var fs = require('fs-extra');
var file = '/tmp/this/path/does/not/exist/file.txt'
fs.outputFile(file, 'hello!', function (err) {
console.log(err); // => null
fs.readFile(file, 'utf8', function (err, data)...