Skip to content

Instantly share code, notes, and snippets.

View jfager's full-sized avatar

Jason Fager jfager

12 followers · 0 following
View GitHub Profile
@jfager
jfager / Today.java
Last active February 18, 2022 06:56
Java 8 - Wrap Checked Exceptions in RuntimeExceptions Less Verbosely
package scratch.unsafe;
import java.util.Random;
public class Today {
public static void main(String[] args) {
String foo;
try {
if(new Random().nextBoolean()) {
@jfager
jfager / fixed_len_vec_macros.rs
Last active June 16, 2019 17:36
Fun w/ rust macros - easily impl traits for fixed-length vectors.
extern mod std;
struct Foo([u8,..2]);
struct Bar([u8,..4]);
macro_rules! fixed_iter_bytes(
($t:ty) => (
impl IterBytes for $t {
fn iter_bytes(&self, lsb0: bool, f: std::to_bytes::Cb) -> bool {
self.as_slice().iter_bytes(lsb0, f)
@jfager
jfager / gist:9707714
Last active May 18, 2016 00:29 — forked from bvssvni/gist:9674632
//! Monad chain macro in Rust
//!
//! A typical usage is to avoid nested match expressions.
//!
//! Supports:
//! - Pattern matching
//! - Or expressions (A | B => ...)
//! - Guarded statements (x if <cond> => ...)
#[feature(macro_rules)];
@jfager
jfager / starvingmap.rs
Last active January 1, 2016 01:28
//#[no_uv]; //Works as expected w/ no_uv
extern mod std;
use std::{rand, task, vec};
use std::rand::Rng;
use std::hashmap::HashMap;
use std::task::TaskBuilder;
@jfager
jfager / msum.rs
Last active December 31, 2015 07:39
extern mod std;
extern mod extra;
use std::{num, util};
fn msum_10927(vals: &[f64]) -> f64 {
let mut partials : ~[f64] = ~[];
// `partials` is already borrowed when looping
// use `modifications` to update `partials`
@jfager
jfager / multicast.rs
Last active December 21, 2015 03:48
Playing around w/ trying to implement multicast.
use std::task;
use std::task::TaskBuilder;
enum MultiCastMsgChan<T> {
Msg(T),
MsgChan(Chan<T>)
}
struct MultiCast<T> {
priv ch: Chan<MultiCastMsgChan<T>>,
@jfager
jfager / ip6_to_str.rs
Created June 25, 2013 10:50
fn ip6_to_str(ip6: &[u8]) -> ~str {
let f = u8::to_str_radix;
return fmt!("%s%s:%s%s:%s%s:%s%s:%s%s:%s%s:%s%s:%s%s",
f(ip6[ 0], 16), f(ip6[ 1], 16),
f(ip6[ 2], 16), f(ip6[ 3], 16),
f(ip6[ 4], 16), f(ip6[ 5], 16),
f(ip6[ 6], 16), f(ip6[ 7], 16),
f(ip6[ 8], 16), f(ip6[ 9], 16),
f(ip6[10], 16), f(ip6[11], 16),
f(ip6[12], 16), f(ip6[13], 16),
@jfager
jfager / overflow.c
Created June 21, 2013 15:28
#include<stdio.h>
main() {
long long a = -9223372036854775808;
long long b = a * -1;
printf("%lld\n", b);
}
@jfager
jfager / segfaulting_server.rs
Last active December 18, 2015 13:09
Run segfaulting_server with 'rustc segfaulting_server.rs && export RUST_LOG=extra::net_tcp=debug && ./segfaulting_server', then run the client. The server will segfault after the 3rd client request. If you comment out lines 43 & 44, everything works great.
extern mod extra;
use std::{int,io,result,task};
use extra::{net,net_tcp,uv};
fn server(outer_ch: Chan<Chan<~str>>) {
let (accept_port, accept_chan) = stream();
let (finish_port, finish_chan) = stream();
let addr = extra::net_ip::v4::parse_addr("127.0.0.1");
@jfager
jfager / simple_server.rs
Last active December 18, 2015 09:59
Writing a websocket server in Rust, ran into an issue where the server would hang after a few connection attempts. Here's a minimal client/server; in the server, if you uncomment the separate spawned task on the default scheduler, the hang always happens. Putting that other task on its own thread makes everything work fine.
extern mod extra;
use std::{int,io,result};
use extra::{net,net_tcp,uv};
fn main() {
let (accept_port, accept_chan) = stream();
let (finish_port, finish_chan) = stream();
let addr = extra::net_ip::v4::parse_addr("127.0.0.1");