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Bash Script: count unique lines in file
I have a large file (millions of lines) containing IP addresses and ports from a several hour network capture, one ip/port per line. Lines are of this format:
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Should I index a bit field in SQL Server?
...worth doing. I admit I don't know enough about how indexes work to understand why that is.
19 Answers
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Stack smashing detected
...elated errors, but like a debugger, it may help you pin-point the location and reason for the crash.
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What's the fastest way to read a text file line-by-line?
...asing this will in general increase performance. The default size is 1,024 and other good choices are 512 (the sector size in Windows) or 4,096 (the cluster size in NTFS). You will have to run a benchmark to determine an optimal buffer size. A bigger buffer is - if not faster - at least not slower t...
Execute a terminal command from a Cocoa app
How can I execute a terminal command (like grep ) from my Objective-C Cocoa application?
12 Answers
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Is there a difference between single and double quotes in Java?
Is there a difference between single and double quotes in Java?
4 Answers
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C++ Lock-free Hazard Pointer（冒险指针） - C/C++ - 清泛网 - 专注C/C++及内核技术
...std::memory_order_acquire); p; p = p->next_) {
if (!p->active_.test_and_set()) {
return p;
}
}
auto p = new HazardPointer<T>();
p->active_.test_and_set();
do {
p->next_ = head_list_.load(std::memory_order_acquire);
} while (!head_list_.compare...
Avoiding instanceof in Java
...ng a chain of "instanceof" operations is considered a "code smell". The standard answer is "use polymorphism". How would I do it in this case?
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String's Maximum length in Java - calling length() method
...ALUE, which is 2^31 - 1 (or approximately 2 billion.)
In terms of lengths and indexing of arrays, (such as char[], which is probably the way the internal data representation is implemented for Strings), Chapter 10: Arrays of The Java Language Specification, Java SE 7 Edition says the following:
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How can I output the value of an enum class in C++11
...e else sees this question you can just use the cast technique method above and simply call "static_cast<int>(value)" to get the integer or "static_cast<A>(intValue)" to get an enum value. Just bear in mind that going from int to enum or enum to enum can cause issues and generally is gene...