diff options
Diffstat (limited to 'src/doc/book/listings/ch19-advanced-features/listing-19-20')
4 files changed, 47 insertions, 0 deletions
diff --git a/src/doc/book/listings/ch19-advanced-features/listing-19-20/Cargo.lock b/src/doc/book/listings/ch19-advanced-features/listing-19-20/Cargo.lock new file mode 100644 index 000000000..b1977d01e --- /dev/null +++ b/src/doc/book/listings/ch19-advanced-features/listing-19-20/Cargo.lock @@ -0,0 +1,6 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +[[package]] +name = "traits-example" +version = "0.1.0" + diff --git a/src/doc/book/listings/ch19-advanced-features/listing-19-20/Cargo.toml b/src/doc/book/listings/ch19-advanced-features/listing-19-20/Cargo.toml new file mode 100644 index 000000000..52395a587 --- /dev/null +++ b/src/doc/book/listings/ch19-advanced-features/listing-19-20/Cargo.toml @@ -0,0 +1,6 @@ +[package] +name = "traits-example" +version = "0.1.0" +edition = "2021" + +[dependencies] diff --git a/src/doc/book/listings/ch19-advanced-features/listing-19-20/output.txt b/src/doc/book/listings/ch19-advanced-features/listing-19-20/output.txt new file mode 100644 index 000000000..684508245 --- /dev/null +++ b/src/doc/book/listings/ch19-advanced-features/listing-19-20/output.txt @@ -0,0 +1,12 @@ +$ cargo run + Compiling traits-example v0.1.0 (file:///projects/traits-example) +error[E0283]: type annotations needed + --> src/main.rs:20:43 + | +20 | println!("A baby dog is called a {}", Animal::baby_name()); + | ^^^^^^^^^^^^^^^^^ cannot infer type + | + = note: cannot satisfy `_: Animal` + +For more information about this error, try `rustc --explain E0283`. +error: could not compile `traits-example` due to previous error diff --git a/src/doc/book/listings/ch19-advanced-features/listing-19-20/src/main.rs b/src/doc/book/listings/ch19-advanced-features/listing-19-20/src/main.rs new file mode 100644 index 000000000..8e295c9b6 --- /dev/null +++ b/src/doc/book/listings/ch19-advanced-features/listing-19-20/src/main.rs @@ -0,0 +1,23 @@ +trait Animal { + fn baby_name() -> String; +} + +struct Dog; + +impl Dog { + fn baby_name() -> String { + String::from("Spot") + } +} + +impl Animal for Dog { + fn baby_name() -> String { + String::from("puppy") + } +} + +// ANCHOR: here +fn main() { + println!("A baby dog is called a {}", Animal::baby_name()); +} +// ANCHOR_END: here |