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Diffstat (limited to 'src/doc/book/listings/ch19-advanced-features/listing-19-27')
3 files changed, 25 insertions, 0 deletions
diff --git a/src/doc/book/listings/ch19-advanced-features/listing-19-27/Cargo.lock b/src/doc/book/listings/ch19-advanced-features/listing-19-27/Cargo.lock new file mode 100644 index 000000000..b2327c755 --- /dev/null +++ b/src/doc/book/listings/ch19-advanced-features/listing-19-27/Cargo.lock @@ -0,0 +1,6 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +[[package]] +name = "functions-example" +version = "0.1.0" + diff --git a/src/doc/book/listings/ch19-advanced-features/listing-19-27/Cargo.toml b/src/doc/book/listings/ch19-advanced-features/listing-19-27/Cargo.toml new file mode 100644 index 000000000..b196f35b5 --- /dev/null +++ b/src/doc/book/listings/ch19-advanced-features/listing-19-27/Cargo.toml @@ -0,0 +1,6 @@ +[package] +name = "functions-example" +version = "0.1.0" +edition = "2021" + +[dependencies] diff --git a/src/doc/book/listings/ch19-advanced-features/listing-19-27/src/main.rs b/src/doc/book/listings/ch19-advanced-features/listing-19-27/src/main.rs new file mode 100644 index 000000000..91b2cf04b --- /dev/null +++ b/src/doc/book/listings/ch19-advanced-features/listing-19-27/src/main.rs @@ -0,0 +1,13 @@ +fn add_one(x: i32) -> i32 { + x + 1 +} + +fn do_twice(f: fn(i32) -> i32, arg: i32) -> i32 { + f(arg) + f(arg) +} + +fn main() { + let answer = do_twice(add_one, 5); + + println!("The answer is: {}", answer); +} |