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C++ nested classes, access fathers variables [duplicate]

由 浪子不回头ぞ 提交于 2019-12-07 06:54:51
问题 This question already has answers here : Can inner classes access private variables? (5 answers) Closed 3 years ago . The title already says a lot, but basically what i want to do is the following(Example): I have a class called A, and another class inside a called B, like so: class A { int a; class B { void test() { a = 20; } }; }; As you can see my goal is for class B to have access to class A, as it is a nested class. Not this wont work, because B doesn't have access to A, but how can it

PHP MySQL Delete parent and child rows

由 馋奶兔 提交于 2019-12-07 06:01:01
问题 I have 1 MySQL Table. It looks like this: +---------+-------------+--------+ | item_id | parent_id | Name | +---------+-------------+--------+ | 1 | 0 | Home | +---------+-------------+--------+ | 2 | 1 | Sub | +---------+-------------+--------+ | 3 | 2 | SubSub | +---------+-------------+--------+ If I DELETE item_id 1, I want to delete the rest of the sub also but how can I do it? I have tried the Foreign Key but it works only if you have 2 tables?? I hope someone can help me in MySQL maybe

Css equivalent of :has() [duplicate]

由 半腔热情 提交于 2019-12-07 03:35:54
问题 This question already has answers here : Is there a CSS parent selector? (31 answers) Closed 4 years ago . In the following example: <div class="section"> <div class="row">...</div> <div class="row"> <- bottom margin here needs to be 0 -> <div class="section"> <div class="row">...</div> <div class="row">...</div> </div> </div> </div> .row { margin-bottom:10px; } If div .row is parent of div .section reset bottom margin to 0. I can do this with jquery, but is there a way to do it in css? 回答1:

jQuery .parent() does not work

由 人走茶凉 提交于 2019-12-06 22:05:49
问题 Why the following code fails with: Error: class_a_jquery_objects[0].parent is not a function ? HTML: <div> <div class='a b'></div> <div class='b c'></div> <div class='c a'></div> </div> <div id='log'></div> JS: $(function() { var class_a_jquery_objects = $(".a"); $("#log").append(class_a_jquery_objects.length + "<br />"); $("#log").append(class_a_jquery_objects[0] + "<br />"); $("#log").append(class_a_jquery_objects[0].parent() + "<br />"); }); 回答1: class_a_jquery_objects[0] is a DOM element

C# property inheritance from parent class

由 大憨熊 提交于 2019-12-06 12:00:43
I want my Player objects to inherit the sum of chips in the Tournament. I get (Attempted to divide by zero.) and I think that's because it fails to inherit Chips from the parent Tournament object. Why is this not working? public partial class Form1 : Form { public Tournament Tournament { get; set; } public Form1() { InitializeComponent(); Tournament = new Tournament(); Tournament.PlayerList.Add(new Player("Hero", 5000)); Tournament.PlayerList.Add(new Player("Villain1", 3000)); Tournament.PlayerList.Add(new Player("Villain2", 4000)); MessageBox.Show(Tournament.PlayerList[0].StackPercentage

mysql to get depth of record, count parent and ancestor records

由 烂漫一生 提交于 2019-12-06 08:59:16
问题 Say I have a post table containing the fields post_id and parent_post_id . I want to return every record in the post table with a count of the "depth" of the post. By depth, I mean, how many parent and ancestor records exist. Take this data for example... post_id parent_post_id ------- -------------- 1 null 2 1 3 1 4 2 5 4 The data represents this hierarchy... 1 |_ 2 | |_ 4 | |_ 5 |_ 3 The result of the query should be... post_id depth ------- ----- 1 0 2 1 3 1 4 2 5 3 Thanks in advance! 回答1:

Jquery Auto expand Parent div when child div height is changed

由 自闭症网瘾萝莉.ら 提交于 2019-12-06 07:12:49
What is the easiest way to make the parent #container div automatically adjust height when the inner #child contenteditable div exceeds the height of the parent div. Here's the example. http://jsfiddle.net/ULUJX/ Try to type inside the #child div until height exceeds the parent div. I'd track keyup events and watch the height of #child , for example: var $child = $('#child'); var $container = $('#container'); var container_height = $container.height(); $container.resizable(); $child.keyup(function() { var h = $child.height(); if(h > container_height) { $container.height(h); container_height =

Change target of all links inside an iframe to “_parent” jquery

由 孤街醉人 提交于 2019-12-06 04:05:55
问题 im trying to set the target to all links inside an iframe to "_parent" using jquery but im not sure how to do it, can anyone help me? <script src="jquery-1.5.2.min.js"> $('a').target("_parent"); </script> <iframe src="http://google.com" frameborder="0"></iframe> Im doing this because I want to customize my firefox 4 homepage to show me the Google's start page with the restore session button near the "Sign in" link, and I almost do it but i don't wanna open the new links or searches inside the

parent::method() - calling non static method

由 妖精的绣舞 提交于 2019-12-06 02:55:56
问题 I don't understand the concept of calling a parent method in PHP. The parent method is not static, yet it is called statically - normally PHP would throw an error/warning. Question is, is this a quirk from PHP, or is this how it should be in OOP? Taking the example from php.net: <?php class A { function example() { echo "I am A::example() and provide basic functionality.<br />\n"; } } class B extends A { function example() { echo "I am B::example() and provide additional functionality.<br />

closest() method not working as expected

由 余生长醉 提交于 2019-12-06 02:53:53
问题 I've a sample example below, I'm not sure why the first example (using div 's) didn't get the text when the second one (using span 's) could achieve that with the same JS code using closest() : $('.class-1').closest('div').find('.class-2').text() First snippet (using div 's) cant get the text using closest() : console.log( $('.class-1').closest('div').find('.class-2').text() ); <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div> <div class="class-1"
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