FastInput - Read input, fast!

FastInput is aimed to simplify reading of known input from stdin, mainly in a competetive programming environment. The crate exposes the FastInput struct which contains methods for reading and parsing line-based input. FastInput does no validation of the input and uses unsafe operations and buffering to achieve great performance.

Example

The following example creates a new FastInput and reads some input:

// Input:
// Hello!
// 12 2000
use fast_input::FastInput;

let mut input = FastInput::new();
// Must make into String as next_line returns a slice to the internal buffer
// and the second input line advances the internal buffer.
let first_line = input.next_line().to_owned();

// Type arguments can often be omitted as rust is awesome, specified here
// for clarity.
let (a, b): (u32, u32) = input.next_tuple();

println!("First line was: {}, a + b = {}", first_line, a + b);

// Read a line of integers and collect into a `Vec`
let numbers: Vec<u32> = input.next_as_iter().collect();

// `FastInput` contains methods to read up to quintuples
let (a, b, c, d, e) = input.next_quintuple();
let sum: 0i32 + a + b + c + d + e;


// Read all remaining lines and print them
while input.has_next_line() {
    println!("{}", input.next_line());
}