copy_impl

Crates.io	copy_impl
lib.rs	copy_impl
version	0.3.3
source	src
created_at	2024-03-30 00:26:36.606042
updated_at	2024-03-30 01:16:08.165179
description	Macro for effortlessly duplicating impl block code across various types in Rust.
homepage	https://github.com/clucompany/copy_impl.git
repository	https://github.com/clucompany/copy_impl.git
max_upload_size
id	1190682
size	39,296

Denis Kotlyarov (denisandroid)

documentation

README

Usage:

Add this to your Cargo.toml:

[dependencies]
copy_impl = "0.3.3"

and this to your source code:

use copy_impl::copy_impl;

Example:

use std::{error::Error, fmt::Write};
use copy_impl::copy_impl;

struct CustomNum<T>(T);
struct UncheckedCustomNum<T>(T);

copy_impl! {
	impl (CustomNum<i8>),
	impl (CustomNum<i16>),
	impl (CustomNum<i32>),
	impl (UncheckedCustomNum<i8>),
	impl (UncheckedCustomNum<i16>) {
		pub fn write_to(&self, mut w: impl Write) -> Result<(), std::fmt::Error> {
			write!(w, "{}", self.0)
		}
	}
}

fn main() -> Result<(), Box<dyn Error>> {
	let mut tbuff = String::new();
	CustomNum(1i8).write_to(&mut tbuff)?;
	CustomNum(2i16).write_to(&mut tbuff)?;
	CustomNum(3i32).write_to(&mut tbuff)?;
	
	UncheckedCustomNum(4i8).write_to(&mut tbuff)?;
	UncheckedCustomNum(5i16).write_to(&mut tbuff)?;
	// UncheckedCustomNum(6i32).write_to(&mut tbuff)?;
	/*
		no method named `write_to` found for struct `UncheckedCustomNum<i32>` in the current scope
		the method was found for
		- `UncheckedCustomNum<i8>`
		- `UncheckedCustomNum<i16>`
	*/
	
	assert_eq!(tbuff, "12345");
	
	Ok(())
}

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