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Message-ID: <486a1bce-dccf-b7a9-a600-e9b8a8f36a97@gmail.com>
Date:   Thu, 20 Jul 2023 10:59:05 -0300
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Subject: Re: [PATCH v2 07/12] rust: init: Add functions to create array
 initializers
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To:     Benno Lossin <benno.lossin@proton.me>,
        Miguel Ojeda <ojeda@kernel.org>,
        Wedson Almeida Filho <wedsonaf@gmail.com>,
        Alex Gaynor <alex.gaynor@gmail.com>
Cc:     Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>,
        =?UTF-8?Q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>,
        Alice Ryhl <aliceryhl@google.com>,
        Andreas Hindborg <nmi@metaspace.dk>,
        rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
        Asahi Lina <lina@asahilina.net>
References: <20230719141918.543938-1-benno.lossin@proton.me>
 <20230719141918.543938-8-benno.lossin@proton.me>
From:   Martin Rodriguez Reboredo <yakoyoku@gmail.com>
In-Reply-To: <20230719141918.543938-8-benno.lossin@proton.me>
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On 7/19/23 11:20, Benno Lossin wrote:
> Add two functions `pin_init_array_from_fn` and `init_array_from_fn` that
> take a function that generates initializers for `T` from usize, the added
> functions then return an initializer for `[T; N]` where every element is
> initialized by an element returned from the generator function.
> 
> Suggested-by: Asahi Lina <lina@asahilina.net>
> Reviewed-by: Björn Roy Baron <bjorn3_gh@protonmail.com>
> Signed-off-by: Benno Lossin <benno.lossin@proton.me>
> ---
> [...]
> +/// Initializes an array by initializing each element via the provided initializer.
> +///
> +/// # Examples
> +///
> +/// ```rust
> +/// use kernel::{error::Error, init::init_array_from_fn};
> +/// let array: Box<[usize; 1_000_000_000]>= Box::init::<Error>(init_array_from_fn(|i| i)).unwrap();
> +/// pr_info!("{array:?}");
> +/// ```

Rather than debug printing the array I'd suggest to assert the struct
size or its elements instead.

> [...]
> +
> +/// Initializes an array by initializing each element via the provided initializer.
> +///
> +/// # Examples
> +///
> +/// ```rust
> +/// use kernel::{sync::{Arc, Mutex}, init::pin_init_array_from_fn, new_mutex};
> +/// let array: Arc<[Mutex<usize>; 1_000_000_000]>=
> +///     Arc::pin_init(pin_init_array_from_fn(|i| new_mutex!(i))).unwrap();
> +/// pr_info!("{}", array.len());
> +/// ```
> [...]
Same as above.