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Is it more efficient to copy a vector by reserving and copying, or by creating and swapping? [duplic
...structs a container with a copy of each of the elements in x , in the same order.
Caution:
Do not use std::vector::swap
std::vector::swap is not copying a vector to another, it is actually swapping elements of two vectors, just as its name suggests. In other words, the source vector to copy fr...
Office在线预览及PDF在线预览的实现方式大集合 - 更多技术 - 清泛网 - 专注...
...用适合中文排版的纯Html、CSS技术。
2、接口简单，适合PHP、JSP、ASP.net等所有的对接，省心省力。
3、费用低廉，节省投入。
4、不用关心客户端是否安装了Office软件，不用在客户端部署。
5、手机在线预览2页Word文档只有3K大小...
Count number of occurrences of a pattern in a file (even on same line)
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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What's the difference between the atomic and nonatomic attributes?
...= userName_;
}
}
Basically, the atomic version has to take a lock in order to guarantee thread safety, and also is bumping the ref count on the object (and the autorelease count to balance it) so that the object is guaranteed to exist for the caller, otherwise there is a potential race conditi...
Deleting multiple elements from a list
...py).
Am I missing something here, any reason to NOT delete in the reverse order?
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How can you profile a Python script?
...e euler048.py
And I get this:
1007 function calls in 0.061 CPU seconds
Ordered by: standard name
ncalls tottime percall cumtime percall filename:lineno(function)
1 0.000 0.000 0.061 0.061 <string>:1(<module>)
1000 0.051 0.000 0.051 0.000 euler048.py:2...
Coding Practices which enable the compiler/optimizer to make a faster program
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The order you traverse memory can have profound impacts on performance and compilers aren't really good at figuring that out and fixing it. You have to be conscientious of cache locality concerns when you write code if you care a...
Swift Beta performance: sorting arrays
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type and size as the old one, with its elements in the correct sorted
order.
The sort function has two declarations.
The default declaration which allows you to specify a comparison closure:
func sort<T>(array: T[], pred: (T, T) -> Bool) -> T[]
And a second declaration that on...
Weak and strong property setter attributes in Objective-C
...ver may be unpredictably set to nil". I have seen some other posts that in order to prevent this warning, you have to create a local strong reference. And if this is true, what's the point to make a property weak, if at the end I have to create a strong reference?
– arh
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Which is faster in Python: x**.5 or math.sqrt(x)?
...l namespace speeds it up more is probably because of the method resolution order: the compiler first checks if the function was defined in your code, then in any imports, so if it was defined locally it takes less time per lookup
– Rotem Shalev
Aug 21 at 11:26
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