hadronized

{-# LANGUAGE RankNTypes #-}

-- A natural transformation.
data NT f g = NT { nt :: forall a. f a -> g a }

-- Natural transformation from Maybe to [].
maybeListNT :: NT Maybe []
maybeListNT = NT (maybe [] pure)

hadronized

fn correct<F>(f: F) where F: for<'a> FnOnce(&'a u32) {
    f(&3)
}

fn dafuck<F>(f: F) where for<'a> F: FnOnce(&'a u32) {
    f(&3)
}

fn main() {
    correct(|x| println!("{}", x));

hadronized

package main

import "fmt"

func fibonacci() func() int {
	a := 0
	b := 1
	return func() int {
		c := a
		a, b = b, a + b

hadronized

extern crate luminance;
extern crate luminance_glfw;

use luminance::framebuffer::Framebuffer;
use luminance::pipeline::{entry, pipeline};
use luminance::shader::program::{Program, ProgramError, Uniform, UniformBuilder, UniformInterface, UniformWarning};
use luminance::tess::{Mode, Tess, TessVertices};
use luminance_glfw::{Action, Device, Key, WindowDim, WindowOpt, WindowEvent};
use std::time::Instant;

hadronized

// g++ main.cpp -std=c++17 -W -Wall -pedantic

#include <cstdlib>
#include <cstdint>
#include <functional>

auto foo() -> std::function<void ()> {
  int32_t a = 317;

  return [&a]() {

hadronized

// Without compiling nor running the following program, what do you expect its output to be? :)
// Have a great monday!

fn main() {
  let mut a: u16 = 42;
  let b: u16 = 7;

  println!("before, a: {}\tb: {}", a, b);

  unsafe { foo(&mut a as *mut u16 as *mut u32); }

hadronized

// The problem arises as I have the following type representing a cache
struct Cache {
  foo_data: Vec<Foo>,
  bar_data: Vec<Bar>,
  // ...
}

// So, there’s a function called get_by_id() that basically takes an index into a one of the Vec<T> above and returns an Option<&T>.
// Though, because of resource dependency, that function takes a mutable Cache so that, in a trait implementation for each type,
// you can ask for a load of another resource in the cache:

hadronized

14:07 < phaazon> is there a way to have access to mmap in rust?
14:08 < kimundi> phaazon: Sure, and there are crates for it too
14:08 < phaazon> kimundi: I thought it’d be in libc
14:08 < kimundi> phaazon: The main issue is just that it is unsafe to create a safe slice from the memroy region returned by it if it backs a file
14:08 < phaazon> https://docs.rs/libc/0.2.17/libc/fn.mmap.html
14:08 < phaazon> ok, it is :D
14:09 < phaazon> kimundi: I’m actually discovering the use of mmap
14:09 < phaazon> I don’t quite really get the point
14:09 < phaazon> if I understand correctly, it creates a mapping from a file into RAM
14:09 < kimundi> yes

hadronized

coin

hadronized

Blue science

• 1 × battery
  • 1 × iron plate
  • 1 × copper plate
  • 2 × sulfuric acid
    • 10 × water
    • 1 × iron plate
    • 5 × sulfur
• 3 × water