// A JSON file format, utilizing serde
use singlefile_formats::json_serde::Json;
// A readable, writable container
use singlefile::container::ContainerWritable;
use serde::{Serialize, Deserialize};

#[derive(Serialize, Deserialize, Default)]
struct MyData {
  magic_number: i32
}

// Attempts to open 'my_data.json', creating it from default if it does not exist,
// expecting data that the `Json` format can decode into `MyData`
let mut my_container = ContainerWritable::<MyData, Json>::create_or_default("my_data.json", Json)?;
// For regular `Container`s, `Deref` and `DerefMut` can be used to access the contained type
println!("magic_number: {}", my_container.magic_number); // 0 (as long as the file didn't exist before)
my_container.magic_number += 1;
// Write the new state of `MyData` to disk
my_container.commit()?;