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Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?
I am doing some numerical optimization on a scientific application. One thing I noticed is that GCC will optimize the call pow(a,2) by compiling it into a*a , but the call pow(a,6) is not optimized and will actually call the library function pow , which greatly slows down the performance. (In ...
C++ convert vector to vector
What is a good clean way to convert a std::vector<int> intVec to std::vector<double> doubleVec . Or, more generally, to convert two vectors of convertible types?
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iOS UI系列 (四) ：可复用的Xib(1) 静态内容 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...这时候我们就可以把这些见面封装到一个XIB里新建Single View Application新建一...有时候页面中的部分内容相同，或者是一些静态的内容组合，这时候我们就可以把这些见面封装到一个XIB里
新建Single View Application
新建一个View.Xib
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Reverse / invert a dictionary mapping
Given a dictionary like so:
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Are global variables bad? [closed]
In C/C++, are global variables as bad as my professor thinks they are?
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What's the difference between a single precision and double precision floating point operation?
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CASCADE DELETE just once
I have a Postgresql database on which I want to do a few cascading deletes. However, the tables aren't set up with the ON DELETE CASCADE rule. Is there any way I can perform a delete and tell Postgresql to cascade it just this once? Something equivalent to
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Sort rows in data.table in decreasing order on string key `order(-x,v)` gives error on data.table 1.
Let's say I have the following data.table in R :
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