PoignardAzur

About variadics in Rust

This is an analysis of how variadic generics could be added to Rust. It's not a proposal so much as a summary of existing work, and a toolbox for creating an eventual proposal.

Introduction

Variadic generics (aka variadic templates, or variadic tuples), are an often-requested feature that would enable traits, functions and data structures to be generic over a variable number of types.

To give a quick example, a Rust function with variadic generics might look like this:

mjohnsullivan

// Updated example from http://rosettacode.org/wiki/Hello_world/Web_server#Rust
// to work with Rust 1.0 beta

use std::net::{TcpStream, TcpListener};
use std::io::{Read, Write};
use std::thread;


fn handle_read(mut stream: &TcpStream) {
    let mut buf = [0u8 ;4096];

niyazpk

// Add / Update a key-value pair in the URL query parameters
function updateUrlParameter(uri, key, value) {
    // remove the hash part before operating on the uri
    var i = uri.indexOf('#');
    var hash = i === -1 ? ''  : uri.substr(i);
         uri = i === -1 ? uri : uri.substr(0, i);

    var re = new RegExp("([?&])" + key + "=.*?(&|$)", "i");
    var separator = uri.indexOf('?') !== -1 ? "&" : "?";
    if (uri.match(re)) {

huonw

while {
    let x = foo();
    bar(x);

    x != 0
} {}

rxaviers

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