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Finding the type of an object in C++
I have a class A and another class that inherits from it, B. I am overriding a function that accepts an object of type A as a parameter, so I have to accept an A. However, I later call functions that only B has, so I want to return false and not proceed if the object passed is not of type B.
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Hex representation of a color with alpha channel?
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In CSS 3, to quote from the spec, "there is no hexadecimal notation for an RGBA value" (see CSS Level 3 spec). Instead you can the use rgba() functional notation with decimals or percentages, e.g. rgba(255, 0, 0, 0.5) would be 50% transparent r...
How to use gitignore command in git
... in folder your_project and a doc directory: your_project/doc.
Remove it from the project directory (without actually deleting it):
git rm --cached doc/*
If you don't already have a .gitignore, you can make one right inside of your project folder: project/.gitignore.
Put doc/* in the .gitignore ...
How to use Session attributes in Spring-mvc
...().setAttribute("cart",value);
return "testJsp";
}
and you can get it from controller like this :
ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");
Make your controller session scoped
@Controller
@Scope("session")
Scope the Objects ,for example you have user object that should...
How do I push to GitHub under a different username?
... @WesternGun Do not provide password in the url if you want to prevent it from being recorded in bash history. Use https://'B_user_name'@github.com/B_user_name/project.git. This should prompt for the password of B_user_name.
– subtleseeker
Jul 8 at 10:39
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How to tell which commit a tag points to in Git?
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From Igor Zevaka:
Summary
Since there are about 4 almost equally acceptable yet different answers I will summarise all the different ways to skin a tag.
git rev-list -1 $TAG (answer). git rev-list outputs the commits that...
Does the JVM prevent tail call optimizations?
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There is also more discussion in Sun bug #4726340, where the evaluation (from 2002) ends:
I believe this could be done nonetheless, but it is not a small task.
Currently, there is some work going on in the Da Vinci Machine project. The tail call subproject's status is listed as "proto 80%"; ...
How can I store my users' passwords safely?
...de access to the table only through stored procedures and prevent the hash from ever being returned. Instead, the client passes what it thinks is the hash and gets a success or failure flag. This allows the stored proc to log the attempt, create a session, etc.
– Steven Sudit...
How to insert an item at the beginning of an array in PHP?
... the following All numerical array keys will be modified to start counting from zero while literal keys won't be touched.
– craned
Dec 4 '15 at 23:23
1
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HTML inside Twitter Bootstrap popover
...t parts of the code is below:
HTML:
<!--
Note: Popover content is read from "data-content" and "title" tags.
-->
<a tabindex="0"
class="btn btn-lg btn-primary"
role="button"
data-html="true"
data-toggle="popover"
data-trigger="focus"
title="<b>Example popover&l...