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What is __declspec and when do I need to use it?
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This is a Microsoft specific extension to the C++ language which allows you to attribute a type or function with storage class information.
Documentation
__declspec (C++)
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Python: Is it bad form to raise exceptions within __init__?
Is it considered bad form to raise exceptions within __init__ ? If so, then what is the accepted method of throwing an error when certain class variables are initialized as None or of an incorrect type?
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windows异常处理 __try __except - C/C++ - 清泛网 - 专注C/C++及内核技术
...t exception_access_violation_filter(LPEXCEPTION_POINTERS p_exinfo)
{
if(p_exinfo->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION)
{
messagebox("access vialation exceptionn");
return EXCEPTION_EXECUTE_HANDLER ; //告诉except处理这个异常
}
el...
How to run code when a class is subclassed? [duplicate]
...f type (i.e. a class) is created by myclass = type(name, bases, clsdict).
If you want something special to happen at the moment of class-creation, then you have to modify the thing creating the class -- i.e. type. The way to do that is to define a subclass of type -- i.e. a metaclass.
A metaclass...
Get Root Directory Path of a PHP project
...oes depends where you use __DIR__ . It is relative to the file itself, so if in an include, inside a sub directory, it'll not return just your root directory.
– Iris
Jun 5 '15 at 14:00
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Python Linked List
...bda lst, el: cons(el, lst), reversed(args), None)
car = lambda lst: lst[0] if lst else lst
cdr = lambda lst: lst[1] if lst else lst
nth = lambda n, lst: nth(n-1, cdr(lst)) if n > 0 else car(lst)
length = lambda lst, count=0: length(cdr(lst), count+1) if lst else count
begin = lambda *args: arg...
Using $_POST to get select option value from HTML
... Why is it always better to give values to your <option> tags? "If no value attribute is included, the value defaults to the text contained inside the element". If it works, what's wrong with that?
– osullic
Jan 8 '19 at 15:46
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How do I add a placeholder on a CharField in Django?
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do you need to specify forms.TextInput to do the attrs={'placeholder': 'Search'} declaration ?
– JhovaniC
Apr 11 '13 at 20:21
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How to use putExtra() and getExtra() for string data
...Actually I have a string variable, say str, which stores some string data. Now, I want to send this data from one activity to another activity.
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Does MongoDB's $in clause guarantee order
...course will be the natural order or by the selected index order as shown.
If you need to preserve this order, then you basically have two options.
So let's say that you were matching on the values of _id in your documents with an array that is going to be passed in to the $in as [ 4, 2, 8 ].
Appr...