diff options
Diffstat (limited to 'src/doc/book/listings/ch17-oop/listing-17-12')
4 files changed, 45 insertions, 0 deletions
diff --git a/src/doc/book/listings/ch17-oop/listing-17-12/Cargo.lock b/src/doc/book/listings/ch17-oop/listing-17-12/Cargo.lock new file mode 100644 index 000000000..b6f4232c6 --- /dev/null +++ b/src/doc/book/listings/ch17-oop/listing-17-12/Cargo.lock @@ -0,0 +1,6 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +[[package]] +name = "blog" +version = "0.1.0" + diff --git a/src/doc/book/listings/ch17-oop/listing-17-12/Cargo.toml b/src/doc/book/listings/ch17-oop/listing-17-12/Cargo.toml new file mode 100644 index 000000000..1619af5c6 --- /dev/null +++ b/src/doc/book/listings/ch17-oop/listing-17-12/Cargo.toml @@ -0,0 +1,6 @@ +[package] +name = "blog" +version = "0.1.0" +edition = "2021" + +[dependencies] diff --git a/src/doc/book/listings/ch17-oop/listing-17-12/src/lib.rs b/src/doc/book/listings/ch17-oop/listing-17-12/src/lib.rs new file mode 100644 index 000000000..b8156c39d --- /dev/null +++ b/src/doc/book/listings/ch17-oop/listing-17-12/src/lib.rs @@ -0,0 +1,19 @@ +pub struct Post { + state: Option<Box<dyn State>>, + content: String, +} + +impl Post { + pub fn new() -> Post { + Post { + state: Some(Box::new(Draft {})), + content: String::new(), + } + } +} + +trait State {} + +struct Draft {} + +impl State for Draft {} diff --git a/src/doc/book/listings/ch17-oop/listing-17-12/src/main.rs b/src/doc/book/listings/ch17-oop/listing-17-12/src/main.rs new file mode 100644 index 000000000..14b4c0824 --- /dev/null +++ b/src/doc/book/listings/ch17-oop/listing-17-12/src/main.rs @@ -0,0 +1,14 @@ +use blog::Post; + +fn main() { + let mut post = Post::new(); + + post.add_text("I ate a salad for lunch today"); + assert_eq!("", post.content()); + + post.request_review(); + assert_eq!("", post.content()); + + post.approve(); + assert_eq!("I ate a salad for lunch today", post.content()); +} |