Rust-Compare: a comparison of Rust, C++, and Java(rust-compare.com)

2 pointsby wspeirs11 ปีที่แล้ว9 comments

Rust-Compare: a comparison of Rust, C++, and Java

http://www.rust-compare.com/site/

3 comments

eteran11 ปีที่แล้ว

Great work! One thing I would change in the C++ Pointers & References is that things like:

    auto b = make_shared<char>('b');

is preferred over

    shared_ptr<char> ptr_b(new char('b'));

This style is better because it's shorter and doesn't make you repeat the type :-)

Unfortunately, make_unique didn't make it into C++11, but is there for C++14

wspeirs11 ปีที่แล้ว

Added a note... thanks!

Jweb_Guru11 ปีที่แล้ว

There are some pretty wrong statements in here, such as that Rust won't allow you to iterate over an array of values.

wspeirs11 ปีที่แล้ว

How do you iterate over an array in Rust?

Jweb_Guru11 ปีที่แล้ว

    fn main() {
        let x = ["a", "b", "c"];
        for i in &x {
            println!("{}", i);
        }
    }

wspeirs11 ปีที่แล้ว

Thanks! Made the fix: https://github.com/wspeirs/rust-compare/commit/0c9fe97c7ae45...

You said there are "some pretty wrong statements," any others? You can also fork and fix if you'd like to help... it'd be greatly appreciated!

xilec11 ปีที่แล้ว

In section "Interfaces"

  impl Interfaces {
    fn my_method(a: isize) -> isize {
      return a;
    }
  }

It isn't implementation of trait. It specify default implementation of trait.

It must be:

  trait Interfaces {
    fn my_method(a: isize) -> isize;
  }

  struct Impl;

  impl Interfaces for Impl {
    fn my_method(a: isize) -> isize {
      return a;
    }
  }

In section "Enums", you can apply default implementation of equality trait:

  #[derive(PartialEq, Eq)]
  enum BasicEnum {
    Option1 = 1,
    Option2
  }

and compare

    if e1 == BasicEnum::Option1 {
        e1 = BasicEnum::Option2
    }

In section "Parameters", you said "All three languages default to pass-by-value if not otherwise specified". For privitive types it's true, but it's not. Classes in Java have reference semantic (copy only address in method). Structs in Rust have move semantic witch is connacted with ownership concept (https://doc.rust-lang.org/stable/book/ownership.html).

In common, many basic things for Rust have very good descriptions in Rust Book (https://doc.rust-lang.org/stable/book/). Please, pay attension on it and be more careful.

wspeirs11 ปีที่แล้ว

I updated interfaces and enums. To your comment about move semantics for structs and such, I actually found the book lacking. I just did a quick Google search of the book for "move semantics" and couldn't find it anywhere. Where specifically does it talk about parameter passing?

steveklabnik11 ปีที่แล้ว

Move semantics are here: http://doc.rust-lang.org/stable/book/ownership.html#move-sem...

[deleted]11 ปีที่แล้ว