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C# switch statement limitations - why?
...a big if-else statement.
Each case must be unique and evaluated
statically. The switch statement does
a constant time branch regardless of
how many cases you have. The if-else
statement evaluates each condition
until it finds one that is true.
In fact, the C# switch statement is n...
google mock分享（全网最全最好的gmock文档，没有之一） - C/C++ - 清泛网 ...
...以返回怎么样的结果。
但这时很多同学往往会提出一个问题："那既然是我自己实现一个假的依赖类"，那和那些市面上的Mock框架有什么关系啊？
这个其实是这样的，这些个Mock框架可以帮助你比较方便、比较轻松地实现这些个...
Network usage top/htop on Linux
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nethogs is nice, but it seems to use way more cpu on my computer than iftop
– aidan
Jul 29 '15 at 6:15
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Comparing Timer with DispatcherTimer
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Check to see what specifically is eating up the cpu. Are you creating lots of timers, that aren't being stopped?
– Reed Copsey
Oct 12 '09 at 17:35
3
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If vs. Switch Speed
Switch statements are typically faster than equivalent if-else-if statements (as e.g. descibed in this article ) due to compiler optimizations.
...
What happens to a declared, uninitialized variable in C? Does it have a value?
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In practice, they tend to just have some nonsensical value in there initially - some compilers may even put in specific, fixed values to make it obvious when looking in a debugger - but strictly speaking, the compiler is free to do anything from crashing to summoning demons through your nasal pass...
How accurate is python's time.sleep()?
...kernel unable to schedule your process as soon as you'd like, even without CPU contention. That's what the realtime kernels are trying to fix, I think. But, unless you really need realtime behavior, simply using a high tick rate (kernel HZ setting) will get you not-guaranteed-but-high-resolution s...
When to use volatile with multi threading?
....
However two threads both accessing a shared variable is something which calls for protection via a mutex isn't it?
But in that case, between the thread locking and releasing the mutex the code is in a critical section where only that one thread can access the variable, in which case the variable ...
Why should hash functions use a prime number modulus?
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Usually a simple hash function works by taking the "component parts" of the input (characters in the case of a string), and multiplying them by the powers of some constant, and adding them together in some integer type. So for e...
Is Java really slow?
...my opinion, this is the main reason Java still has a bad reputation, especially server-side. This makes the String problems exponentially worse. Some simple mistakes are common: objects are often used in place of primitives, reducing performance and increasing memory use. Many Java libraries (includ...