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Borrow and references in moving semantics.

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This commit is contained in:
neerajadsul 2023-08-19 15:37:06 +01:00
parent ed5be7f1d6
commit 5db97e5d08
4 changed files with 9 additions and 14 deletions
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3
exercises/move_semantics/move_semantics3.rs
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@ -6,7 +6,6 @@
// Execute `rustlings hint move_semantics3` or use the `hint` watch subcommand // Execute `rustlings hint move_semantics3` or use the `hint` watch subcommand
// for a hint. // for a hint.
// I AM NOT DONE
fn main() { fn main() {
let vec0 = Vec::new(); let vec0 = Vec::new();
@ -20,7 +19,7 @@ fn main() {
println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1); println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
} }
fn fill_vec(vec: Vec<i32>) -> Vec<i32> { fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
vec.push(22); vec.push(22);
vec.push(44); vec.push(44);
vec.push(66); vec.push(66);

6
exercises/move_semantics/move_semantics4.rs
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@ -7,12 +7,10 @@
// Execute `rustlings hint move_semantics4` or use the `hint` watch subcommand // Execute `rustlings hint move_semantics4` or use the `hint` watch subcommand
// for a hint. // for a hint.
// I AM NOT DONE
fn main() { fn main() {
let vec0 = Vec::new();
let mut vec1 = fill_vec(vec0); let mut vec1 = fill_vec();
println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1); println!("{} has length {} content `{:?}`", "vec1", vec1.len(), vec1);
@ -23,7 +21,7 @@ fn main() {
// `fill_vec()` no longer takes `vec: Vec<i32>` as argument // `fill_vec()` no longer takes `vec: Vec<i32>` as argument
fn fill_vec() -> Vec<i32> { fn fill_vec() -> Vec<i32> {
let mut vec = vec; let mut vec = Vec::new();
vec.push(22); vec.push(22);
vec.push(44); vec.push(44);

3
exercises/move_semantics/move_semantics5.rs
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@ -6,13 +6,12 @@
// Execute `rustlings hint move_semantics5` or use the `hint` watch subcommand // Execute `rustlings hint move_semantics5` or use the `hint` watch subcommand
// for a hint. // for a hint.
// I AM NOT DONE
fn main() { fn main() {
let mut x = 100; let mut x = 100;
let y = &mut x; let y = &mut x;
let z = &mut x;
*y += 100; *y += 100;
let z = &mut x;
*z += 1000; *z += 1000;
assert_eq!(x, 1200); assert_eq!(x, 1200);
} }

11
exercises/move_semantics/move_semantics6.rs
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@ -5,24 +5,23 @@
// Execute `rustlings hint move_semantics6` or use the `hint` watch subcommand // Execute `rustlings hint move_semantics6` or use the `hint` watch subcommand
// for a hint. // for a hint.
// I AM NOT DONE
fn main() { fn main() {
let data = "Rust is great!".to_string(); let data = "Rust is great!".to_string();
get_char(data); get_char(&data);
string_uppercase(&data); string_uppercase(data);
} }
// Should not take ownership // Should not take ownership
fn get_char(data: String) -> char { fn get_char(data: &String) -> char {
data.chars().last().unwrap() data.chars().last().unwrap()
} }
// Should take ownership // Should take ownership
fn string_uppercase(mut data: &String) { fn string_uppercase(mut data: String) {
data = &data.to_uppercase(); data = data.to_uppercase();
println!("{}", data); println!("{}", data);
} }