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Why isn't `int pow(int base, int exponent)` in the standard C++ libraries?
... number and n equal to 10. In this scenario, pown_l won. glibc pow() took 12.0 user seconds, pown took 7.4 user seconds, and pown_l took only 6.5 user seconds. So that's not too surprising. We were more or less expecting this.
Then, I let x be constant (I set it to 2.5), and I looped n from 0 to 19...
In C++, is it still bad practice to return a vector from a function?
...::accumulate(v.begin(), v.end(), sum); by for (int k : v) sum += std::sqrt(2.0*k);:
Conclusions
Using output parameters instead of returning by value may provide performance gains by re-using capacity.
On a modern desktop computer, this seems only applicable to large vectors (>16MB) and smal...
Do zombies exist … in .NET?
...ments may be valuable to readers.
Immortal Blue pointed out that in .NET 2.0 and up finally blocks are immune to thread aborts. And as commented by Andreas Niedermair, this may not be an actual zombie thread, but the following example shows how aborting a thread can cause problems:
class Program
...
How do I expand a tuple into variadic template function's arguments?
...'s template arguments: std::apply(add_generic<float>, std::make_pair(2.0f, 3.0f));
– Erbureth says Reinstate Monica
May 24 '18 at 13:29
...
Detect if Visual C++ Redistributable for Visual Studio 2012 is installed
...ncies\{050d4fc8-5d48-4b8f-8972-47c82c46020f}
Configuration: x64
Version: 12.0.30501.0
Direct Download URL: https://download.microsoft.com/download/2/E/6/2E61CFA4-993B-4DD4-91DA-3737CD5CD6E3/vcredist_x64.exe
Microsoft Visual C++ 2013 Redistributable (x86)
Registry Key: HKLM\SOFTWARE\Classes\Insta...
Can C++ code be valid in both C++03 and C++11 but do different things?
... and C++03 although it provide a warning by default in C++11:
int x[] = { 2.0 };
This is covered in the draft C++11 standard section 8.5.4 List-initialization paragraph 3:
List-initialization of an object or reference of type T is defined as follows:
and contains the following bullet (empha...
Why are C# 3.0 object initializer constructor parentheses optional?
...might change the syntax so that it is not ambiguous. When they designed C# 2.0 they had this problem:
yield(x);
Does that mean "yield x in an iterator" or "call the yield method with argument x?" By changing it to
yield return(x);
it is now unambiguous.
In the case of optional parens in an o...
Optimise PostgreSQL for fast testing
...random_page_cost: if you have SSD or fast RAID array you can lower this to 2.0 (RAID) or even lower (1.1) for SSD
checkpoint_segments: you can go higher 32 or 64 and change checkpoint_completion_target to 0.9. Lower value allows faster after-crash recovery
...
社交应用组件 · App Inventor 2 中文网
...安装了语音应用程序，谷歌语音选项仅适用于支持 Android 2.0 (Eclair) 或更高版本。
不幸的是，由于以下原因，谷歌语音App中引入的变更，导致谷歌语音不再被接收。
要指定电话号码（例如 650-555-1212），请将 电话号码 属性设置...
What C++ Smart Pointer Implementations are available?
...aPointer except it doesn't implicitly call detach(). I'd call this version 2.0 of QSharedDataPointer as that slight increase in control as to exactly when to detach after the reference count drops to zero isn't particularly worth a whole new object.
QSharedPointer - Atomic reference counting, threa...