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How to detect if a function is called as constructor?
...oking at the ECMAScript 3rd edition spec, the steps taken when new x() is called are essentially:
Create a new object
Assign its internal [[Prototype]] property to the prototype property of x
Call x as normal, passing it the new object as this
If the call to x returned an object, return it, otherw...
Why should the copy constructor accept its parameter by reference in C++?
... reference, it's by value. To do that you make a copy, and to do that you call the copy constructor. But to do that, we need to make a new value, so we call the copy constructor, and so on...
(You would have infinite recursion because "to make a copy, you need to make a copy".)
...
What is `related_name` used for in Django?
... back to your model.
If you don't specify a related_name, Django automatically creates one using the name of your model with the suffix _set, for instance User.map_set.all().
If you do specify, e.g. related_name=maps on the User model, User.map_set will still work, but the User.maps. syntax is ob...
CSS: background image on background color
...ch I colored blue if this panel is being selected (clicked on it). Additionally, I add a small sign ( .png image) to that panel, which indicates that the selected panel has been already selected before.
...
Android存储系统基础知识：内部存储，外部存储，App特定目录 ASD(app speci...
...r
file:///storage/emulated/0/
要访问外部存储，需要 READ_ 或 WRITE_EXTERNAL_STORAGE 权限。
App特定目录 ASD(App-specific directory)
此外，可能还有一个特定于应用程序的目录（ASD），可以使用以下命令创建
Tai...
MFC Dialog中嵌入View、动态创建View的方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...的需要手动调一下。代码如下，亲测有效：
//.h
CView *m_pDemoView;
//.cpp 构造函数或OnInitDialog函数
CMainContainer::OnInitDialog() //CDialog才有，像CWnd等没有OnInitDialog可以放在构造函数中，然后OnPaint()函数中改变大小并显示。
{
m_pDem...
return statement vs exit() in main()
Should I use exit() or just return statements in main() ? Personally I favor the return statements because I feel it's like reading any other function and the flow control when I'm reading the code is smooth (in my opinion). And even if I want to refactor the main() function, having return...
When do items in HTML5 local storage expire?
...may run into space considerations. It's good to program defensively. Generally however things remain "forever" based on some practical definition of that word.
edit — obviously, your own application can actively remove stuff if it decides it's too old. That is, you can explicitly include some so...
How to use Morgan logger?
...mote ip, request method, http version, response status, user agent etc. It allows you to modify the log using tokens or add color to them by defining 'dev' or even logging out to an output stream, like a file.
For the purpose we thought we can use it, as in this case, we still have to use:
console...
Get URL query string parameters
...
This is actually the best answer based on the question. The other answers only get the current URI whereas the question only specifies "from URL".
– Chris Harrison
Aug 29 '13 at 5:38
...