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What does T&& (double ampersand) mean in C++11?

...his factory function: template <typename T, typename A1> std::unique_ptr<T> factory(A1& a1) { return std::unique_ptr<T>(new T(a1)); } If we called factory<foo>(5), the argument will be deduced to be int&, which will not bind to a literal 5, even if foo's constr...
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How to correctly close a feature branch in Mercurial?

...ant to merge results back to the default branch and close feature-x in order to get rid of it in the output of hg branches . ...
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File to byte[] in Java

...mes happen, that you will not read whole file. – bugs_ Sep 20 '12 at 9:40 8 Such situation can oc...
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How do I force a UITextView to scroll to the top every time I change the text?

...this line in your UITextFielDelegate method. ` func textViewDidEndEditing(_ textView: UITextView) { textView.scrollRangeToVisible(NSRange(location: 0, length: 0)) } ` – lifewithelliott Mar 15 '17 at 6:11 ...
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What does the “Just” syntax mean in Haskell?

...nalysis of values that belong to types with more than one constructor. In order to use a Maybe a value in a pattern match, you need to provide a pattern for each constructor, like so: case maybeVal of Nothing -> "There is nothing!" Just val -> "There is a value, and it is " ++ (sh...
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How to import a class from default package

... ".C" File's function/method to this one: JNIEXPORT jint JNICALL Java_com_mypackage_Calculations_Calculate(JNIEnv *env, jobject obj, jint contextId) { //code goes here } JNIEXPORT jdouble JNICALL Java_com_mypackage_Calculations_GetProgress(JNIEnv *env, jobject obj, jint contextId) { //co...
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Creating temporary files in Android

.../file extension (.tmp by default) e.g you specify your filename as internal_file and comes out as internal_file1456345.tmp. Whereas you can specify the extension you can't specify the number that is added. You can however find the filename it generates via file.getName();, but you would need to stor...
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Difference in System. exit(0) , System.exit(-1), System.exit(1 ) in Java

... edited May 4 '15 at 7:47 nazar_art 12.6k3535 gold badges111111 silver badges179179 bronze badges answered Nov 6 '12 at 8:42 ...
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How can I create an Asynchronous function in Javascript?

..., 0 ); (where yourFn is a reference to your function) or, with Lodash: _.defer( yourFn ); Defers invoking the func until the current call stack has cleared. Any additional arguments are provided to func when it's invoked. ...
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How is Math.Pow() implemented in .NET Framework?

..., because the problem that you are solving (i.e. the one with integers) is orders of magnitudes simpler, and can be solved in a few lines of C# code with the exponentiation by squaring algorithm. share | ...