KOTLIN AND RUST FOR BEGINNERS: 2 BOOKS IN 1 - Learn Coding Fast! KOTLIN Programming Language And RUST Crash Course, A QuickStart Guide, Tutorial Book by Program Examples, In Easy Steps! by SEL TAM

Author:SEL, TAM [SEL, TAM]
Language: eng
Format: epub
Published: 2019-11-08T16:00:00+00:00

Ownership and functions

When a variable is passed to the function, then the ownership moves to the variable of a called function. The semantics of passing value is equal to the assigning a value to a variable.

Let's understand this through an example:

fn main()

{

let s=String::from("Rustlang" );

take_ownership(s);

let ch='a' ;

moves_copy(ch);

println!("{}" ,ch);

}

fn take_ownership(str:String)

{

println!("{}" ,str);

}

fn moves_copy(c:char)

{

println!("{}" ,c);

}

Output:

Rustlang

a

a

In the above example, string 's' binds with the value "Rustlang" and the ownership of 's' variable is passed to the variable 'str' through a take_ownership() function. The 'ch' variable binds with a value 'a,' and the ownership of 'ch' variable is passed to the variable 'c' through a moves_copy() function. The 'ch' variable can also be used afterwards as the type of this variable is a "copy" trait.

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