大约有 2,600 项符合查询结果（耗时：0.0215秒） [XML]
Why doesn't c++ have &&= or ||= for booleans?
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The only way to get an invalid value into a bool is by using reinterpret_cast on pointers:
int i = 2;
bool b = *reinterpret_cast<bool*>(&i);
b |= true; // MAY yield 3 (but doesn’t on my PC!)
But since this code results in undefined behaviour anyway, we may safely ignore this potenti...
What is the difference between a URI, a URL and a URN?
...resource from its location. For example:
http://example.com/mypage.html
ftp://example.com/download.zip
mailto:user@example.com
file:///home/user/file.txt
tel:1-888-555-5555
http://example.com/resource?foo=bar#fragment
/other/link.html (A relative URL, only useful in the context of another URL)
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Convert interface{} to int
I'm trying to get a value from a JSON and cast it to int but it doesn't work, and I don't know how to do it properly.
10 An...
source of historical stock data [closed]
...se it everyday to update you history. If you want to download from http or ftp with CSI, you must pay about 200€ on month. Sorry, but it's too expensive.
– davidxxx
Mar 14 '15 at 20:27
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Why doesn't 'ref' and 'out' support polymorphism?
...ny variable, not only out parameter variable. And also the reader needs to cast the argument value to Mammal before he attempts to access it as Mammal and of course it can fail if he is not considerate
– astef
Jun 20 '18 at 20:46
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What is move semantics?
I just finished listening to the Software Engineering radio podcast interview with Scott Meyers regarding C++0x . Most of the new features made sense to me, and I am actually excited about C++0x now, with the exception of one. I still don't get move semantics ... What is it exactly?
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Struggling with NSNumberFormatter in Swift for currency
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No need to cast it to NSNumber you can use formatter method func string(for obj: Any?) -> String?. So you just need to use string(for: price) instead of string(from: price)
– Leo Dabus
Mar 22 '1...
Create a new object from type parameter in generic class
...r, even in JavaScript. If you have a class Foo{ method() { return true; }, casting {} to T will not give you this method!
– JCKödel
Apr 26 '19 at 16:12
add a comment
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Getting the current Fragment instance in the viewpager
...ager.getCurrentItem());
// based on the current position you can then cast the page to the correct
// class and call the method:
if (ViewPager.getCurrentItem() == 0 && page != null) {
((FragmentClass1)page).updateList("new item");
}
return true;
Please ...
Which characters make a URL invalid?
...or example, can contain an optional username so it could be something like ftp://user@hostname/ where the '@' character has special meaning.
Here is an example of a URL that has invalid and unwise characters (e.g. '$', '[', ']') and should be properly encoded:
http://mw1.google.com/mw-earth-vector...