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mod back_of_house {
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pub struct Breakfast {
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pub toast: String,
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seasonal_fruit: String,
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}
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impl Breakfast {
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pub fn summer(toast: &str) -> Breakfast {
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Breakfast {
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toast: String::from(toast),
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seasonal_fruit: String::from("peaches"),
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}
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}
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}
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}
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pub fn eat_at_restaurant() {
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// 在夏天订购一个黑麦土司作为早餐
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let mut meal = back_of_house::Breakfast::summer("Rye");
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// 改变主意更换想要面包的类型
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meal.toast = String::from("Wheat");
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println!("I'd like {} toast please", meal.toast);
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// 如果取消下一行的注释代码不能编译；
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// 不允许查看或修改早餐附带的季节水果
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// meal.seasonal_fruit = String::from("blueberries");
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}
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