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Pure virtual function with implementation
...tation. A derived class can explicitly call the base class implementation (if access permissions allow it) by using a fully-scoped name (by calling A::f() in your example - if A::f() were public or protected). Something like:
class B : public A {
virtual void f() {
// class B doesn't ...
Fastest way to duplicate an array in JavaScript - slice vs. 'for' loop
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Sadly for short arrays the answer is vastly different. For example cloning an array of listeners before calling each of them. Those arrays are often small, usually 1 element.
– gman
Feb 13 '15 at 2:05
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How to define a circle shape in an Android XML drawable file?
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No need for the size in the shape if you later define a square size for the view.
– Ferran Maylinch
Nov 25 '15 at 17:58
2
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How to copy a directory using Ant
...How do you copy the contents of a directory using Ant". There is a subtle difference.
– cmcginty
Jan 26 '13 at 0:41
"t...
What is the difference between ng-app and data-ng-app?
I have begun to learn about AngularJS and am confused about what the differences are between the ng-app and data-ng-app directives.
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How do I calculate someone's age in Java?
I want to return an age in years as an int in a Java method.
What I have now is the following where getBirthDate() returns a Date object (with the birth date ;-)):
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Strip whitespace from jsp output
...utput? Is there a switch I can flip on my web.xml? Is there a Tomcat specific setting?
9 Answers
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TCPServer TCP服务器扩展：在Android设备上创建TCP服务器 · App Inventor 2 中文网
...鼠标移动时拖动元素 document.onmousemove = function(e) { if (!isDragging) return; element.style.left = (e.clientX - offsetX) + 'px'; element.style.top = (e.clientY - offsetY) + 'px'; }; // 鼠标释放时停止拖动 document.onmouseup = function(...
Swift: Pass array by reference?
I want to pass my Swift Array account.chats to chatsViewController.chats by reference (so that when I add a chat to account.chats , chatsViewController.chats still points to account.chats ). I.e., I don't want Swift to separate the two arrays when the length of account.chats changes.
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JavaScript % (modulo) gives a negative result for negative numbers
... The modulo operation is not very well defined over negative numbers, and different computing environments handle it differently. Wikipedia's article on the modulo operation covers it pretty well.
– Daniel Pryden
Dec 17 '10 at 4:08
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