Attribute Macro aoc_runner_derive::aoc_generator

#[aoc_generator]

Generator meta

Use a generator when you need to pre-process your input :

Usage

Generator meta have 3 forms :

• a generator for the whole day : #[aoc_generator(day1)]
• a generator for a single part : #[aoc_generator(day1, part1)]
• a generator for a single (named) solution: #[aoc_generator(day1, part1, Bytes)]

The function must take a single parameter : a &str or a &[u8], and output any sized type.

The corresponding solutions now take any parameter for which Borrow is implemented.

Results & Options

Since 0.2.0, you can output Result & Option from generator function, with the following constraints :

• the output type must be named Result or Option, type CustomResult<T> = Result<T, CustomError>; cannot be used in return position.
• for Results, the error must implement Into<std::error::Error>

You still can use a path before the Result/Option, like this : std::io::Result<i32>

Note

A generator must be declared before it’s solutions.