class | 易学教程

Template in Fortran?

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问题 I have a module that defines three types and and some operations on them. In a separate module, I want to define an algorithm that operates on either one of these types using the operations defined in the module. The algorithm is the same, regardless of the type. I can overload it, but I was wondering if I can save a lot of typing by defining some sort of template algorithm. What I have in mind is something like class templates in C++. Thanks 回答1: Fortran does not have templates, but you can

Cannot use concatenation when declaring default class properties in PHP?

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问题 When declaring default values for properties in a PHP class, it appears you can not use concatenation. Is there a reason for this? class Foo { public $property = __DIR__ . '/'; } 回答1: For PHP Versions Before 5.6 See http://www.php.net/manual/en/language.oop5.properties.php They are defined by using one of the keywords public, protected, or private, followed by a normal variable declaration. This declaration may include an initialization, but this initialization must be a constant value--that

jQuery select random elements with same class

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问题 I have elements with class "selectElement". When I click on element with that class, I "select" it, and give it another class "selectedElements", if it doesn't already have it. But, I have a button that should randomly select certain number (e.g. 10) of elements with class "selectElement" and give them the "selectedElement" class. I tried something like in this answer -> https://stackoverflow.com/a/1764629/1011539, but it returns same values every time... EDIT: Solved with Jon's help. Here is

jQuery toggle class

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问题 I'm having trouble adding in jQuery's toggleClass function into the rest of my code. The page has several HTML5 audio tags on it which are controlled via jQuery. I attempted to add the toggle function to my jQuery audio control function, but it's not adding the class and subsequently the audio control doesn't work.. so I suppose it's some weird syntax error. What do you guys recommend? Below is a jsFiddle and a my (unfortunately) weak attempt :) http://jsfiddle.net/danielredwood/FTfSq/10/

jQuery toggle class

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Calling static method on a class?

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问题 Say, I have a reference to a Class object with SomeType having a static method. Is there a way to call that method w/o instantiating SomeType first? Preferably not escaping strong typing. EDIT: OK, I've screwed up. interface Int{ void someMethod(); } class ImplOne implements Int{ public void someMethod() { // do something } } Class<? extends Int> getInt(){ return ImplOne.class; } In this case someMethod() can't be static anyways. 回答1: A static method, by definition, is called on a class and

Having a “+” in the class name?

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问题 Class name: MyAssembly.MyClass+MyOtherClass The problem is obviously the + as separator, instead of traditionnal dot, its function, and to find official documentation to see if others separators exist. 回答1: That's just the way that a nested type is represented. So for example: namespace Foo { class Outer { class Nested {} } } will create a type with a full name of Foo.Outer+Nested in the compiled code. (So that's what typeof(Outer.Nested).FullName would return, for example.) It's not clear to

前端笔记之bootstrap今日头条用例

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<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <link rel="stylesheet" href="bootstrap/css/bootstrap.min.css"> <script src="js/jquery.min.js"></script> <script src="bootstrap/js/bootstrap.min.js"></script> <title>今日头条</title> <style> .type-list { color: black; } .type-list .active, .type-list .active:hover { color: white; background-color: brown; } .type-list .list-group-item and not .active:hover {

In C++ I Cannot Grasp Pointers and Classes

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问题 I'm fresh out of college and have been working in C++ for some time now. I understand all the basics of C++ and use them, but I'm having a hard time grasping more advanced topics like pointers and classes. I've read some books and tutorials and I understand the examples in them, but then when I look at some advanced real life examples I cannot figure them out. This is killing me because I feel like its keeping me from bring my C++ programming to the next level. Did anybody else have this

How to assign a new class attribute via dict?

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问题 I want to assign a class attribute via a string object - but how? Example: class test(object): pass a = test() test.value = 5 a.value # -> 5 test.__dict__['value'] # -> 5 # BUT: attr_name = 'next_value' test.__dict__[attr_name] = 10 # -> 'dictproxy' object does not support item assignment 回答1: There is a builtin function for this: setattr(test, attr_name, 10) Reference: http://docs.python.org/library/functions.html#setattr Example: >>> class a(object): pass >>> a.__dict__['wut'] = 4 Traceback