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Polymorphism in C++
...hosen at runtime based on config files, command line switches, UI settings etc.,
implementation varied at runtime, such as for a state machine pattern.
When there's not a clear driver for run-time polymorphism, compile-time options are often preferable. Consider:
the compile-what's-called aspec...
How to sum up an array of integers in C#
...= arr.AsParallel().Sum(); a faster version that uses multiple cores of the CPU. To avoid System.OverflowException you can use long sum = arr.AsParallel().Sum(x => (long)x); For even faster versions that avoid overflow exception and support all integer data types and uses data parallel SIMD/SSE in...
How can you do anything useful without mutable state?
...odies which make programming more efficient, such as first-class functions etc.
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Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
...differ by a a multiple of 4096 have a false dependency on Intel SnB-family CPUs. (i.e. same offset within a page). This can reduce throughput when some of the operations are stores, esp. a mix of loads and stores.
– Peter Cordes
Mar 18 '16 at 1:52
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AsyncTask threads never die
...xecution. How many will run at once is based on the number of cores of the CPU. AFAIK, the current algorithm is 2N+1 parallel threads, where N is the number of cores.
– CommonsWare
Feb 16 '18 at 11:40
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How can I list the contents of a directory in Python?
...t have to os.path.isdir/file to know if it's a file or not, and that saves CPU time because stat is already done when scanning dir in Windows:
example to list a directory and print files bigger than max_value bytes:
for dentry in os.scandir("/path/to/dir"):
if dentry.stat().st_size > max_va...
How much is the overhead of smart pointers compared to normal pointers in C++?
...plementation details and CPU architecture for write barriers, atomic locks etc. once listening you will never talk about this feature being cheap. If you just want a proof of the magnitude slower, skip the first 48 minutes and watch him running example code which runs upto 180 times slower (compiled...
Homebrew作者解不出面试题，被Google拒绝 - 创意 - 清泛网 - 专注C/C++及内核技术
...其作者在进入Google的面试中，因解不出一个二叉树翻转的问题，直接被Google拒绝。
Max Howell在Twitter上推文大意如下：
Google：虽然我们90%的工程师都在用你写的Homebrew，但这也并没有什么卵用，你连二叉树翻转都写不出，直接...
“hello, world” 起源及其他 - 创意 - 清泛网 - 专注C/C++及内核技术
...章（我的hello world）、环境搭建成功后的第一个测试…
问题的提出
相传古时候有个退休的程序员，在家闲来无事，决定修习书法之道。第一日，备好笔墨纸砚，便挥毫写下一行大字：“hello, world”。
学过编程语言的人都笑了...
13 个免费学习编程的好地方 - 创意 - 清泛网 - 专注C/C++及内核技术
...算机编程入门的好地方。
GitHub
有时候，当你因为某个问题卡壳了，你需要查阅些资料，你就需要GitHub 了。在这里你可以找到 500 本免费编程书，涵盖 80 个不同的编程语言，这些书在Git 库托管服务中，这意味着会被定期更新。...