All Questions
71 questions
0
votes
2
answers
110
views
how to work around object safe traits in rust
I'm working on writing a toy database implementation in Rust and I can't get around this trait requirement to be object safe. I basically want a way of representing a database table with columns of ...
- 137
0
votes
0
answers
66
views
Impl trait method on generic and vec of generic within a struct
I'm trying to implement the approx crate traits for a struct and it's fine with the values that are f64, but I don't know how to implement for the Vec values.
The struct is
pub struct Body<T> {
...
0
votes
1
answer
410
views
Rust trait method with default implementation self type is not what is expected
So I have this FileSystem trait in rust
pub trait FileSystem: Debug + Send + Sync
And in that trait I have this method here with a default implementation:
fn location_with_sub_path(&self, ...
- 327
0
votes
1
answer
422
views
Generic constructor for generic type in Rust
TL;DR: How do I guarantee I can construct arbitrary structs with WhateverStruct::new()?
This:
trait Constructable {
fn new() -> Self;
}
struct Foo {
bar: u8
/* whatever else it may ...
0
votes
1
answer
1k
views
How to access struct fields from an implemented trait function in Rust?
So, following a tutorial online, I wanted to extend the functionality of a trait, Canine, using the name field from the struct the trait is implemented on:
struct Animal {
name: String,
}
impl ...
- 502
1
vote
1
answer
45
views
cast struct that not explictly impl a trait to the trait object?
If there is a struct NotTFoo has a method called say_hi that statifies TFoo trait but not explictly impl TFoo, is it possible to use NotTFoo as a TFoo trait object?
// the trait
trait TFoo {
fn ...
user5819540
1
vote
1
answer
717
views
How to implement a trait for another trait in rust?
I have a trait called DataValue in my rust project, and all of my "DataValue" structs inherit from it and the trait itself is used to define shared functionality so that I can store "...
- 327
2
votes
1
answer
250
views
How do I return a reference in rust, that is automatically dereferenced
Let's say I have the struct:
struct Vector {
data: [f32; 2]
}
Implementing the Index trait is easy:
impl IndexMut<usize> for Vector {
fn index_mut(&mut self, index: usize) -> &...
- 89
0
votes
1
answer
112
views
Extracting varying, parameterized 'new' methods to trait
I'm new to Rust and just bumped into this issue.
I have many different structs, that all implement their own new methods, with a varying number of input parameters and types. Every new method does ...
- 13
3
votes
1
answer
805
views
How do I have a trait as a owned field of a struct?
I'm fairly new to Rust, I was tying to implement a struct that could have different structs that implemented a common trait as a field
In traditional programming languages with garbage collector I ...
0
votes
0
answers
49
views
Implementing Struct for Trait: cannot infer type
Getting the following error:
error[E0283]: type annotations needed
--> src/client.rs:35:30
|
35 | println!("client: {:?}", Command::add_task("test", 10));
| ...
- 7,871
-1
votes
1
answer
119
views
Add a member in a struct that implements a trait specified
Let's say I have this struct in Rust:
// Trait that allows objects that
// implement it to return themselves
// to the caller.
trait ReturnsSelf {
fn get_self(self) -> Self {
self
}
...
- 148
-1
votes
1
answer
357
views
Rust not finding method of trait struct because of lifetime parameters [duplicate]
I was trying to do simple struct with few traits following examples on the internet an came across the following problem.
//My struct in framebuffer.rs
pub struct HighLevelFrameBuffer<'a> {
...
- 1,308
0
votes
1
answer
60
views
How to lifetime annotate From trait in rust when indexing vector
I'd like to use the From trait to extract values from a json input into my struct CreateUser. If I extract the full etc vector as etc: Vec<String> it works fine, but I only need the second field ...
- 162
0
votes
1
answer
82
views
Idiomatic way to implement interchanged trait bound
I have a problem with how to force a trait bound on a struct. The struct will not make sense without the trait and therefore I want to enforce that user-defined model implement PricingModel. The issue ...
