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When is std::weak_ptr useful?

I started studying smart pointers of C++11 and I don't see any useful use of std::weak_ptr . Can someone tell me when std::weak_ptr is useful/necessary? ...
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how to convert milliseconds to date format in android?

... 15 Answers 15 Active ...
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How to save/restore serializable object to/from file?

... 142 You can use the following: /// <summary> /// Serializes an object. /// <...
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How to know if other threads have finished?

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Is there auto type inferring in Java?

... | edited Jul 12 '13 at 4:26 answered Apr 21 '13 at 15:28 ...
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Why malloc+memset is slower than calloc?

...c() and calloc() are mostly there to take small allocations (anything from 1 byte to 100s of KB) and group them into larger pools of memory. For example, if you allocate 16 bytes, malloc() will first try to get 16 bytes out of one of its pools, and then ask for more memory from the kernel when the ...
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Count number of objects in list [closed]

... 169 length(x) Get or set the length of vectors (including lists) and factors, and of any other...
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In C#, what happens when you call an extension method on a null object?

... 401 That will work fine (no exception). Extension methods don't use virtual calls (i.e. it uses the ...
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The shortest possible output from git log containing author and date

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When should I use jQuery's document.ready function?

... 143 In simple words, $(document).ready is an event which fires up when document is ready. ...