What exactly is nullptr?

How is it a keyword and an instance of a type? This isn’t surprising. Both true and false are keywords and as literals they have a type ( bool ). nullptr is a pointer literal of type std::nullptr_t, and it’s a prvalue (you cannot take the address of it using &). 4.10 about pointer conversion says that a prvalue of type std::nullptr_t is a null pointer constant, and that an … Read more

Difference between npx and npm?

NPM – Manages packages but doesn’t make life easy executing any.NPX – A tool for executing Node packages. NPX comes bundled with NPM version 5.2+ NPM by itself does not simply run any package. it doesn’t run any package in a matter of fact. If you want to run a package using NPM, you must specify that package in your package.json file. When executables are installed via NPM packages, NPM links to … Read more

What’s the canonical way to check for type in Python?

To check if o is an instance of str or any subclass of str, use isinstance (this would be the “canonical” way): To check if the type of o is exactly str (exclude subclasses): The following also works, and can be useful in some cases: See Built-in Functions in the Python Library Reference for relevant information. One more note: in this case, if you’re using Python 2, you … Read more

How do I break a string in YAML over multiple lines?

Using yaml folded style. The indention in each line will be ignored. A line break will be inserted at the end. http://symfony.com/doc/current/components/yaml/yaml_format.html You can use the “block chomping indicator” to eliminate the trailing line break, as follows: In either case, each line break is replaced by a space. There are other control tools available as … Read more

Difference between Git and GitHub

Git is a revision control system, a tool to manage your source code history. GitHub is a hosting service for Git repositories. So they are not the same thing: Git is the tool, GitHub is the service for projects that use Git. To get your code to GitHub, have a look here.

How do you comment out code in PowerShell?

In PowerShell V1 there’s only # to make the text after it a comment. In PowerShell V2 <# #> can be used for block comments and more specifically for help comments. For more explanation about .SYNOPSIS and .* see about_Comment_Based_Help. Remark: These function comments are used by the Get-Help CmdLet and can be put before the keyword Function, or inside the {} before or after the code itself.

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