const shade = 100;
type Shade = 100;
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-- (This code was run in PostgreSQL 9.6.1) | |
-- Demonstration of how serializable isolation for PostgreSQL, which detects possible | |
-- interference between concurrent transactions, can produce false positives | |
-- in psql, create the following table | |
CREATE TABLE users( | |
id SERIAL NOT NULL PRIMARY KEY, | |
username VARCHAR NOT NULL | |
); |
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def join_game(user_id, game_id) do | |
with {:ok, user} <- Users.get(user_id), | |
{:ok, game} <- Games.get(game_id), | |
false <- Game.is_full?(game), | |
false <- Game.is_started?(game), | |
true <- User.has_permission?(user, game) | |
do | |
Game.add_user(game, user) | |
else | |
# Don't care what specific thing failed |
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use std::str; | |
fn main() { | |
// -- FROM: vec of chars -- | |
let src1: Vec<char> = vec!['j','{','"','i','m','m','y','"','}']; | |
// to String | |
let string1: String = src1.iter().collect::<String>(); | |
// to str | |
let str1: &str = &src1.iter().collect::<String>(); | |
// to vec of byte |
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