diff options
Diffstat (limited to 'src/doc/book/listings/ch19-advanced-features/no-listing-02-impl-outlineprint-for-point')
4 files changed, 57 insertions, 0 deletions
diff --git a/src/doc/book/listings/ch19-advanced-features/no-listing-02-impl-outlineprint-for-point/Cargo.lock b/src/doc/book/listings/ch19-advanced-features/no-listing-02-impl-outlineprint-for-point/Cargo.lock new file mode 100644 index 000000000..b1977d01e --- /dev/null +++ b/src/doc/book/listings/ch19-advanced-features/no-listing-02-impl-outlineprint-for-point/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/no-listing-02-impl-outlineprint-for-point/Cargo.toml b/src/doc/book/listings/ch19-advanced-features/no-listing-02-impl-outlineprint-for-point/Cargo.toml new file mode 100644 index 000000000..52395a587 --- /dev/null +++ b/src/doc/book/listings/ch19-advanced-features/no-listing-02-impl-outlineprint-for-point/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/no-listing-02-impl-outlineprint-for-point/output.txt b/src/doc/book/listings/ch19-advanced-features/no-listing-02-impl-outlineprint-for-point/output.txt new file mode 100644 index 000000000..0991f10fa --- /dev/null +++ b/src/doc/book/listings/ch19-advanced-features/no-listing-02-impl-outlineprint-for-point/output.txt @@ -0,0 +1,18 @@ +$ cargo run + Compiling traits-example v0.1.0 (file:///projects/traits-example) +error[E0277]: `Point` doesn't implement `std::fmt::Display` + --> src/main.rs:20:6 + | +20 | impl OutlinePrint for Point {} + | ^^^^^^^^^^^^ `Point` cannot be formatted with the default formatter + | + = help: the trait `std::fmt::Display` is not implemented for `Point` + = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead +note: required by a bound in `OutlinePrint` + --> src/main.rs:3:21 + | +3 | trait OutlinePrint: fmt::Display { + | ^^^^^^^^^^^^ required by this bound in `OutlinePrint` + +For more information about this error, try `rustc --explain E0277`. +error: could not compile `traits-example` due to previous error diff --git a/src/doc/book/listings/ch19-advanced-features/no-listing-02-impl-outlineprint-for-point/src/main.rs b/src/doc/book/listings/ch19-advanced-features/no-listing-02-impl-outlineprint-for-point/src/main.rs new file mode 100644 index 000000000..a1e2fe4c4 --- /dev/null +++ b/src/doc/book/listings/ch19-advanced-features/no-listing-02-impl-outlineprint-for-point/src/main.rs @@ -0,0 +1,27 @@ +use std::fmt; + +trait OutlinePrint: fmt::Display { + fn outline_print(&self) { + let output = self.to_string(); + let len = output.len(); + println!("{}", "*".repeat(len + 4)); + println!("*{}*", " ".repeat(len + 2)); + println!("* {} *", output); + println!("*{}*", " ".repeat(len + 2)); + println!("{}", "*".repeat(len + 4)); + } +} + +// ANCHOR: here +struct Point { + x: i32, + y: i32, +} + +impl OutlinePrint for Point {} +// ANCHOR_END: here + +fn main() { + let p = Point { x: 1, y: 3 }; + p.outline_print(); +} |