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How does std::forward work? [duplicate]
I know what it does and when to use it but I still can't wrap my head around how it works. Please be as detailed as possible and explain when std::forward would be incorrect if it was allowed to use template argument deduction.
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Yes/No message box using QMessageBox
...ion>
#include <QMessageBox>
#include <QDebug>
// ...
void MyWidget::someSlot() {
QMessageBox::StandardButton reply;
reply = QMessageBox::question(this, "Test", "Quit?",
QMessageBox::Yes|QMessageBox::No);
if (reply == QMessageBox::Yes) {
qDeb...
How to empty a Heroku database
... app} substitute the name of your app. For example, if your app is called my_great_app then you use:
heroku pg:reset DATABASE_URL --confirm my_great_app
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Undo git update-index --skip-worktree
...t need to remember it. I use alias hidden="git ls-files -v | grep '^S'" in my .bash_profile. It works great!
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Proper way to wait for one function to finish before continuing?
...ago, and really want to update it. While callbacks are absolutely fine, in my experience they tend to result in code that is more difficult to read and maintain. There are situations where I still use them though, such as to pass in progress events and the like as parameters. This update is just to ...
How do you remove a Cookie in a Java Servlet
... I tried setMaxAge(0) initially in firefox but I still saw it listed in my cookies as "Expires: at end of session" and thought my servlet was still receiving that expired cookie. It might've been a combo of needing to set the response.setContentType("text/html"); and setMaxAge(0); that made ...
setNeedsLayout vs. setNeedsUpdateConstraints and layoutIfNeeded vs updateConstraintsIfNeeded
...alls updateConstraintsIfNeeded, so calling it manually is rarely needed in my experience. In fact, I have never called it except when debugging layouts.
Updating constraints using setNeedsUpdateConstraints is pretty rare too, objc.io–a must read about autolayouts–says:
If something changes ...
Django datetime issues (default=datetime.now())
...swered May 5 '10 at 8:52
Carson MyersCarson Myers
32.8k3333 gold badges113113 silver badges162162 bronze badges
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Loading basic HTML in Node.js
...ggestion too. It's pretty sweet, and I'm pretty sure I'll be using it for my next project. My goal was to kinda figure out how it's done under the hood before I let the framework do the heavy lifting for me.
– David Granado
Jan 18 '11 at 22:39
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Basic http file downloading and saving to disk in python?
... Python and I've been going through the Q&A on this site, for an answer to my question. However, I'm a beginner and I find it difficult to understand some of the solutions. I need a very basic solution.
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