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How does Duff's device work?
...he article on Wikipedia on the Duff's device , and I don't get it. I am really interested, but I've read the explanation there a couple of times and I still don't get it how the Duff's device works.
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Which is better option to use for dividing an integer number by 2?
...ter of the compiler got to choose among several implementation choices, usually with substantial constraints. Here, one constraint is that the % and / operators must be consistent for both positive and negative operands so that (a/b)*b+(a%b)==a is true regardless of the signs of a and b. Usually, th...
Postgres and Indexes on Foreign Keys and Primary Keys
Does Postgres automatically put indexes on Foreign Keys and Primary Keys? How can I tell? Is there a command that will return all indexes on a table?
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What and When to use Tuple? [duplicate]
...ing property names in your data representation. Tuples are better for your CPU.
– Avindra Goolcharan
Feb 12 at 19:12
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Why is volatile needed in C?
...olatile variable.
There are at least three common reasons to use it, all involving situations where the value of the variable can change without action from the visible code: When you interface with hardware that changes the value itself; when there's another thread running that also uses the ...
C语言之父辞世引发“分号”悼念 - 创意 - 清泛网 - 专注C/C++及内核技术
...要一门高级计算机语言做工具，为了解决程序的可移植性问题，肯·汤普逊和丹尼斯·里奇决定对它进行简单改进，形成 NB语言。但NB在Unix的移植方面依然不尽人意，此后里奇又对NB语言做了改进，C语言诞生。
这被计算机界认为...
How to repeat a string a variable number of times in C++?
...han copying many small blocks? I can think of branch prediction. Regarding CPU cache I am unsure which variant is preferred.
– Florian Kaufmann
Jan 21 '16 at 7:42
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Are non-synchronised static methods thread safe if they don't modify static class variables?
... case) are also thread-safe because once created they can't be changed and all threads see the same value. On the other hand if the method was accepting (mutable) Date you could have had a problem. Two threads can simultaneously modify that same object instance, causing race conditions and visibilit...
Difference between string and text in rails?
...ng it as a singular char t. I migrated a column without realizing this and all future rows where the value is true is now t. Does anyone have any insights into this behaviour?
– Peter
Aug 11 '15 at 18:25
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What is the best way to compare floats for almost-equality in Python?
...the magnitudes of the two arguments; as the values get larger, so does the allowed difference between them while still considering them equal.
abs_tol is an absolute tolerance that is applied as-is in all cases. If the difference is less than either of those tolerances, the values are considered eq...