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Generate random numbers uniformly over an entire range
...a thread_local: the generator is quite plump (> 2 KB) and is better not allocated on the stack
seed mt19937 with more than one integer: the Mersenne Twister has a big state and can take benefit of more entropy during initialization
Some not-so-good choices
The C++11 library
While being the m...
How does the “final” keyword in Java work? (I can still modify an object.)
...ed than checking whether a variable is final. Mutable objects can be stack-allocated as well. final fields may help the escape analysis, though, but that's a quite indirect route. Also note that effectively final variables have identical treatement as those marked final in the source code.
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How do I remove diacritics (accents) from a string in .NET?
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You should preallocate the StringBuilder buffer to the name.Length to minimize memory allocation overhead. That last Split/Join call to remove sequential duplicate _ is interesting. Perhaps we should just avoid adding them in the loop. Se...
Do I cast the result of malloc?
... someone suggested in a comment that I should not cast the result of malloc , i.e.
29 Answers
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Enabling auto layout in iOS 6 while remaining backwards compatible with iOS 5
...Storyboard instantiateInitialViewController];
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
self.window.rootViewController = self.initialViewController;
[self.window makeKeyAndVisible];
return YES;
}
@end
Having 2 targets works aswell but seems li...
How do you set, clear, and toggle a single bit?
...fields is a bad idea. You have no control over the order in which bits are allocated (from the top or the bottom), which makes it impossible to serialize the value in a stable/portable way except bit-at-a-time. It's also impossible to mix DIY bit arithmetic with bitfields, for example making a mask ...
How to unescape HTML character entities in Java?
...rformance. Turns out, it does a lot of unnecessary operations. For one, it allocates a StringWriter for every call, even if there's nothing to unescape in the string. I've rewritten that code differently, now it works much faster. Whoever finds this in google is welcome to use it.
Following code u...
Overloading member access operators ->, .*
...ays overloaded, or overloading rules don't really apply to it (13.5/5: The allocation and deallocation functions, operator new, operator new[], operator delete and operator delete[], are described completely in 3.7.4. The attributes and restrictions found in the rest of this subclause do not apply t...
Can you call ko.applyBindings to bind a partial view?
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you can also use "with" to allocate regions of the page to individual models - data-bind="with:VMA"
– lexicalscope
Aug 10 '12 at 14:23
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通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
... libraries: libc.so.6: failed to map segment
from shared object: Cannot allocate memory
从上面的结果可以看到，此时 ls 运行失败。根据系统给出的错误信息我们可以看出是由于调用 libc 库时内存分配失败而导致的 ls 出错。那么我们来看一下这...