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Is gcc std::unordered_map implementation slow? If so - why?

... performance critical software in C++. There we need a concurrent hash map and implemented one. So we wrote a benchmark to figure out, how much slower our concurrent hash map is compared with std::unordered_map . ...
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Conveniently map between enum and int / String

...t(byte num) { return map.get(num); } } This solution is nice and doesn't require 'fiddling with reflection' because it's based on the fact that all enum types implicitly inherit the Enum interface. share ...
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Differences in string compare methods in C#

...the block below. What I am curious about are the differences between them and when one should be used over the others? Should one be avoided at all costs? Are there more I haven't listed? ...
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What kind of leaks does automatic reference counting in Objective-C not prevent or minimize?

In the Mac and iOS platforms, memory leaks are often caused by unreleased pointers. Traditionally, it has always been of utmost importance to check your allocs, copies and retains to make sure each has a corresponding release message. ...
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Nokogiri installation fails -libxml2 is missing

...is present, however, it doesn't differentiate between "libxml2 is missing" and "a compiler to test libxml2 is missing". share | improve this answer | follow | ...
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What are the advantages of using nullptr?

...n write this: template<typename T> void f(T *ptr); //function to handle non-nullptr argument void f(nullptr_t); //an overload to handle nullptr argument!!! 1. In C++, NULL is defined as #define NULL 0, so it is basically int, that is why f(int) is called. ...
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Java Persistence / JPA: @Column vs @Basic

What is the difference between @Column and @Basic annotations in JPA? Can they be used together? Should they be used together? Or does one of them suffice? ...
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Best practice: PHP Magic Methods __set and __get [duplicate]

... I have been exactly in your case in the past. And I went for magic methods. This was a mistake, the last part of your question says it all : this is slower (than getters/setters) there is no auto-completion (and this is a major problem actually), and type management b...
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How to get process ID of background process?

I start a background process from my shell script, and I would like to kill this process when my script finishes. 7 Answers...
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FileSystemWatcher vs polling to watch for file changes

... I have seen the file system watcher fail in production and test environments. I now consider it a convenience, but I do not consider it reliable. My pattern has been to watch for changes with the files system watcher, but poll occasionally to catch missing file changes. Edit...