diff options
Diffstat (limited to 'src/doc/book/listings/ch15-smart-pointers/listing-15-10')
3 files changed, 39 insertions, 0 deletions
diff --git a/src/doc/book/listings/ch15-smart-pointers/listing-15-10/Cargo.lock b/src/doc/book/listings/ch15-smart-pointers/listing-15-10/Cargo.lock new file mode 100644 index 000000000..4297c6733 --- /dev/null +++ b/src/doc/book/listings/ch15-smart-pointers/listing-15-10/Cargo.lock @@ -0,0 +1,6 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +[[package]] +name = "deref-example" +version = "0.1.0" + diff --git a/src/doc/book/listings/ch15-smart-pointers/listing-15-10/Cargo.toml b/src/doc/book/listings/ch15-smart-pointers/listing-15-10/Cargo.toml new file mode 100644 index 000000000..67ec198f7 --- /dev/null +++ b/src/doc/book/listings/ch15-smart-pointers/listing-15-10/Cargo.toml @@ -0,0 +1,6 @@ +[package] +name = "deref-example" +version = "0.1.0" +edition = "2021" + +[dependencies] diff --git a/src/doc/book/listings/ch15-smart-pointers/listing-15-10/src/main.rs b/src/doc/book/listings/ch15-smart-pointers/listing-15-10/src/main.rs new file mode 100644 index 000000000..cce754d08 --- /dev/null +++ b/src/doc/book/listings/ch15-smart-pointers/listing-15-10/src/main.rs @@ -0,0 +1,27 @@ +// ANCHOR: here +use std::ops::Deref; + +impl<T> Deref for MyBox<T> { + type Target = T; + + fn deref(&self) -> &Self::Target { + &self.0 + } +} +// ANCHOR_END: here + +struct MyBox<T>(T); + +impl<T> MyBox<T> { + fn new(x: T) -> MyBox<T> { + MyBox(x) + } +} + +fn main() { + let x = 5; + let y = MyBox::new(x); + + assert_eq!(5, x); + assert_eq!(5, *y); +} |