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Can I list-initialize a vector of move-only type?
...gt; idiom described on cpptruths (cpptruths.blogspot.com/2013/09/…). The idea is to determine lvalue/rvalue at run-time and then call move or copy-construction. in<T> will detect rvalue/lvalue even though the standard interface provided by initializer_list is const reference.
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Disable pasting text into HTML form
...on to do this. Warn someone that what they are trying to do is not a good idea in most cases, but give an answer... or it's best to just not bother replying.
– Halfhoot
Aug 2 '17 at 19:39
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Pattern to avoid nested try catch blocks?
...ing a 3rd party library and has to do the best they can to ensure success. Ideally, the input could by validated first and the correct calculation function chosen to ensure it will not fail - of course, you could then put all that in a try/catch just to be safe ;)
– musefan
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Abusing the algebra of algebraic data types - why does this work?
... automatically and my less-than-subtle choice of names should give you the idea. The (&&&) operator is defined in Control.Arrow, by the way.
The dual of the above is the coproduct A+B with injections inl : A → A+B and inr : B → A+B, where given any type C and functions f : A → C, g...
If string is empty then return some default value
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Phrogz sort of gave me the idea in PofMagicfingers comment, but what about overriding | instead?
class String
def |(what)
self.strip.blank? ? what : self
end
end
@user.address | "We don't know user's address"
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Why does Java allow us to compile a class with a name different than the file name?
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@AndrewBarber, the analogy perfectly fits the idea of directory, in the long corridor you can quickly find a person by just glancing on the door plates, you do not need to enter each room and ask.
– exebook
Dec 2 '13 at 15:15
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How do cache lines work?
...e cache memory areas renders the CPU defect as a whole).
To give a timing idea (source: costs to access caches and memory)
L1 cache: 1ns to 2ns (2-4 cycles)
L2 cache: 3ns to 5ns (6-10 cycles)
L3 cache: 12ns to 20ns (24-40 cycles)
RAM: 60ns (120 cycles)
Since we mix different CPU types these ar...
PHP and MySQL - how to avoid password in source code? [duplicate]
...'s worse than having it in your source code.
It's also going to be a good idea to have a base (empty / default) version of the configuration file, and separate it out per environments, so that you could have a different configuration file for production, development, and testing platforms.
An envi...
What is the fastest way to compare two sets in Java?
...on, there is an approach that can improve the "almost the same" case.
The idea is that you need to pre-calculate and cache a hash for the entire set so that you could get the set's current hashcode value in O(1). Then you can compare the hashcode for the two sets as an acceleration.
How could y...
莱昂氏unix源代码分析 PDF - 文档下载 - 清泛网 - 专注C/C++及内核技术
...4.4.1 第1组“.h”文件 236
4.4.2 汇编语言文件 237
4.4.3 在第一部分中的其他文件 237
4.5 第二部分 237
4.6 第三部分 238
4.7 第四部分 238
4.8 第五部分 239
第一部分 初始化、进程初始化
第5章 两个文件 241
5.1 文件malloc...