The following code will have borrowing problem
fn print_years(years: Vec<i32>) {
for year in years.iter() {
println!("Year: {}", year);
}
} // dealloc(years): after function scrop ends, dealloc happen
fn man() {
let years = vec![1990,1995,2000,2010];
print_years(years); // years got deallocated
print_years(years); // compile error
}
Reoslve use-after-move compiler error: transfer ownership to caller scope by add return keyword in function.
fn print_years(years: Vec<i32>) -> Vec<i32> {
for year in years.iter() {
println!("Year: {}", year);
}
return years; // If we add return, Rust will transfer ownership to caller scope
}
fn main() {
let years = vec![1990,1995,2000,2010];
let years2 = print_years(years);
let years3 = print_years(years2);
}
.clone() is your friend when you are a beginner :)
fn print_years(years: Vec<i32>) -> Vec<i32> {
for year in years.iter() {
println!("Year: {}", year);
}
}
fn main() {
let years = vec![1990,1995,2000,2010];
print_years(years.clone());
print_years(years);
}