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Why is it wrong to use std::auto_ptr with standard containers?
...t an STL element must be "copy-constructible" and "assignable." In other words, an element must be able to be assigned or copied and the two elements are logically independent. std::auto_ptr does not fulfill this requirement.
Take for example this code:
class X
{
};
std::vector<std::auto_ptr&...
is there an virtual environment for node.js?
...iki modules page, but I can't find anything similar to virtualenv (python) or rvm.
7 Answers
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How to retrieve a single file from a specific revision in Git?
I have a Git repository and I'd like to see how some files looked a few months ago. I found the revision at that date; it's 27cf8e84bb88e24ae4b4b3df2b77aab91a3735d8 . I need to see what one file looks like, and also save it as a ("new") file.
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How to parse a JSON string to an array using Jackson
...I finally got it:
ObjectMapper objectMapper = new ObjectMapper();
TypeFactory typeFactory = objectMapper.getTypeFactory();
List<SomeClass> someClassList = objectMapper.readValue(jsonString, typeFactory.constructCollectionType(List.class, SomeClass.class));
...
Looping through localStorage in HTML5 and JavaScript
So, I was thinking I could just loop through localStorage like a normal object as it has a length. How can I loop through this?
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What's the name for hyphen-separated case?
...
There isn't really a standard name for this case convention, and there is disagreement over what it should be called.
That said, as of 2019, there is a strong case to be made that kebab-case is winning:
https://trends.google.com/trends/explore?date=all&q=...
Instantiating object of type parameter
...bout T is that it is some subclass of Object. You need to specify some factory to create instances of T.
One approach could use a Supplier<T>:
class MyClass<T> {
private final Supplier<? extends T> ctor;
private T field;
MyClass(Supplier<? extends T> ctor) {
th...
How do Google+ +1 widgets break out of their iframe?
... JavaScript widget is running within the context of your website and therefore is not constrained by the Origin Inheritance Rules for iframes. Therefore this JavaScript widget can set whatever DOM events it wants on the parent site even though it appears to be just a simple iframe.
Another thing,...
Reload Flask app when template file changes
...running Flask application using the built-in server ( Flask.run ), it monitors its Python files and automatically reloads the app if its code changes:
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How to replace multiple strings in a file using PowerShell
I am writing a script for customising a configuration file. I want to replace multiple instances of strings within this file, and I tried using PowerShell to do the job.
...