a is of type [i32; 3]; an array of three i32s. [i32; 3] does not implement an iter method, but it does dereference into &[i32]. &[i32] implements an iter method which produces an iterator. This iterator implements Iterator<Item=&i32>. It uses &i32 rather than i32 because the iterator has to work on arrays of any type, … Read more
Just remove the # sign, leave only [INSTALLLOCATION] and it should work. The # symbol referes to file keys. Without the # it refers to a property and all directories become properties. See the article about Formatted data type for more details.
Programming from the Ground Up (free book, highly recommended) x86 Assembly (wikibooks.org) Essential Resources for x86 Programmers
I dug into the source code and learned how Schema class is converted by the SchemaFactory.createForClass method. Well so how it works? 1. Take a look at this example below: @Schema() export class Cat extends Document { @Prop() name: string; } export const catSchema = SchemaFactory.createForClass(Cat); Basically, when you do SchemaFactory.createForClass(Cat) Nest will convert the … Read more
You can achieve it with Gradle application plugin
You interpret the error correctly, and the reason is that it simply isn’t implemented. If the standard library writers wanted to make this work, they’d have to implement PartialEq for &i32 == i32, i32 == &i32, &mut i32 == i32, i32 == &mut i32, &i32 == &mut i32 and &mut i32 == &i32. And then … Read more
Option comes with utility methods for various transformations, which are listed in its documentation. For any T that implements Clone (which String does), Option<&T>::cloned does what you’re looking for. Clone is more specific than ToOwned, so .cloned() isn’t an exact match for .map(|x| x.to_owned()). For example, it won’t turn an Option<&str> into an Option<String>; for … Read more
In your example, [1, 2, 3] is not treated as local variable, but as static one! Let’s take a look at this code: fn foo() -> &’static [i32] { &[1, 2, 3] } This works! Some time ago, RFC 1414: Rvalue Static Promotion was merged: “Promote constexpr rvalues to values in static memory instead of … Read more
(playground links to solutions using type parameters and associated types) In this case &T and &mut T are just two different types. Code that is generic over different types (at both compile-time and run-time) is idiomatically written in Rust using traits. For example, given: struct Foo { value: i32 } struct Bar { foo: Foo … Read more