gwengrid

#!/usr/bin/env python
from models.project impport Project

all_projects = Project().find()
for project in all_projects:
  for sheet in project:
  		upload_group = Upload().find('uid':sheet['upload'])
  		
		change_set = get_change_set(publish_date, order) 
		if not change_set:

gwengrid

class Thunder { }
class Fire { }

protocol Pokemon {
    typealias PokemonType
    func attack(move:PokemonType)
}

struct Pikachu: Pokemon {
    typealias PokemonType = Thunder

gwengrid

#! python

for i in range(1, 101):
    string = ""
    if i % 3 == 0:
        string += "Crackle"
    if i % 5 == 0:
        string += "Pop"
    if not len(string):
        string += str(i)

gwengrid

Slides for talk

https://speakerdeck.com/gwengrid/keep-calm-and-type-erase-on

Some Further Reading

Step-By-Step, writing a type-erased wrapper class by Hector Matos

Why?! No type parameters on generic protocols pt 1 pt 2 by Russ Bishop

gwengrid

#! python
import random

def print_board(board, size):
    for j in range(0, size):
        marker = ""
        for i in range(0, size):
            saved = board.get((i, j))
            if saved:
                marker += saved + " "