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Case objects vs Enumerations in Scala
...The following items from the enumeration definition are not available:
1.2 - Members are naturally ordered and explicitly indexed
2 - All members can easily be iterated through based on their indexes
3 - A member can be retrieved with its (case sensitive) name
3.1 - It would be quite nice ...
How can I efficiently select a Standard Library container in C++11?
..._ container, otherwise use its traditional ordered counterpart.
Question 1.2: Separate Key ?
If the key is separate from the value, use a map, otherwise use a set
Question 1.3: Duplicates ?
If you want to keep duplicates, use a multi, otherwise do not.
Example:
Suppose that I have several...
Difference between `constexpr` and `const`
...p;); // sum will not modify its argument (§2.2.5)
vector<double> v {1.2, 3.4, 4.5}; // v is not a constant
const double s1 = sum(v); // OK: evaluated at run time
constexpr double s2 = sum(v); // error : sum(v) not constant expression
For a function to be usable in a constant expression, tha...
深入理解 x86/x64 的中断体系 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
... IVT 表从地址 0x0 - 0x3FF，占据了 1024 个字节，即 1K bytes
1.2 改变中断向量表地址
事实上，我们完全可以在实模式下更改 IVT 的地址，下面的代码作为示例：
; ****************************************************************
; * boot.as...
Regular expression to match URLs in Java
...'t understand the protocol. Other than that anything goes. It won't catch: 1.2.3. 1.2.3.4.5 1.2,3.4.5: etc
– David Newcomb
Jun 9 '11 at 15:12
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Uber5岁了，一次性告诉你它的商业之道 - 资讯 - 清泛网 - 专注C/C++及内核技术
...获得基础车费3.5倍的收入，平常时段为2倍，其他系列为1.2倍。以人民优步为例，在上下班高峰期，司机接下一个车费为20元的下单并完成后，其收入是：基础车费20元3.5倍的收入70元，系统收取20%佣金后如数返还，基础车费45%的...
SQL JOIN and different types of JOINs
...A
INNER JOIN Table2 B ON A.<Primary-Key> =B.<Foreign-Key>;
1.2: INNER-JOIN: Natural-JOIN implementation
Select A.*, B.Col1, B.Col2 --But no B.ForeignKeyColumn in Select
FROM Table1 A
INNER JOIN Table2 B On A.Pk = B.Fk;
1.3: INNER-JOIN with NON-Equi-join implementation
...
Fastest way to list all primes below N
...
... And it can be made yet faster with additional ~1.2x-1.3x speedup, drastic reduction in memory footprint from O(n) to O(sqrt(n)) and improvement in empirical time complexity, by postponing the addition of primes to the dict until their square is seen in the input. Test it ...
Is Java really slow?
...ntributed to the "Java is slow" reputation:
Before JIT compilation (Java 1.2/1.3), the language was only interpreted, not compiled, and thus very slow.
JIT compilation took time to become efficient (major improvements with each version)
Classloading has become a lot more efficient over the years. ...
Using git repository as a database backend
...──────┼─────────┤
│ MusicBrainz │ 1.2M │ 1K/week │ 30 GiB │ 20 GiB │
│ en.wikipedia │ 21.5M │ 133K/month │ 3 TiB │ 44 GiB │
│ OSM │ 1.7M │ 21K/month │ 726 GiB │ 480 GiB │
Obviously, for that amounts...