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FAT32系统中长文件名的存储 - C/C++ - 清泛网 - 专注C/C++及内核技术
...件名。长文件名依然是记录在目录项中的。为了低版本的OS或程序能正确读取长文件名文件，系统自动为所...FAT32的一个重要的特点是完全支持长文件名。长文件名依然是记录在目录项中的。
为了低版本的OS或程序能正确读取长...
Visibility of global variables in imported modules
...a Python script. I'll do my best to describe the error, why I run into it, and why I'm tying this particular approach to solve my problem (which I will describe in a second):
...
Measuring execution time of a function in C++
...::high_resolution_clock::now();
auto duration = std::chrono::duration_cast<std::chrono::microseconds>( t2 - t1 ).count();
std::cout << duration;
return 0;
}
This will measure the duration of the function.
NOTE: You will not always get the same timing for a function. This...
How can I get all the request headers in Django?
...
According to the documentation request.META is a "standard Python dictionary containing all available HTTP headers". If you want to get all the headers you can simply iterate through the dictionary.
Which part of your code to do this depends on your exact requirement. Anypla...
Using the Swift if let with logical AND operator &&
...n("do stuff")
}
This uses the where clause.
Another example, this time casting AnyObject to Int, unwrapping the optional, and checking that the unwrapped optional meets the condition:
if let w = width as? Int where w < 500
{
println("success!")
}
For those now using Swift 3, "where" ha...
T-SQL datetime rounded to nearest minute and nearest hours with using functions
...en the datetime in question and a fixed point in time (0, which implicitly casts to 1900-01-01 00:00:00.000):
declare @days int
set @days = datediff(day, 0, @dt)
and then add that number of days to the fixed point in time, which gives you the original date with the time set to 00:00:00.000:
sele...
Python concatenate text files
...each file by f = open(...) , read line by line by calling f.readline() , and write each line into that new file. It doesn't seem very "elegant" to me, especially the part where I have to read//write line by line.
...
Safe (bounds-checked) array lookup in Swift, through optional bindings?
..., to clarify the situation: b contains a value and the value is nil. If we casted automatically to Int?, we would loose the information, if we got a hit or a miss in the array, which might be necessary in some circumstances. I would rather debate, if Swift could get rid of automatically casting valu...
How do I check CPU and Memory Usage in Java?
I need to check CPU and memory usage for the server in java, anyone know how it could be done?
15 Answers
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JavaScript plus sign in front of function expression
...
Subsidiary to @TJCrowder's answer, + is usually used to force numerical casting of a value as this SO answer explains. In this instance it is called the 'unary plus operator' (for ease of googling).
var num = +variant;
So in front of a function it can be a way to force the function's result to...