Ptr

The ptr module defines the ptr type for pointer-like referencing and modification of existing variables

All the given examples assume the following imports:

let ptr = import('std/ptr');
let io = import('std/io');

Functions

• new

ptr Member Functions

• set
• get

new

ptr.new(var = nil) -> ptr

Creates a new pointer, optionally pointing to the given variable var.

Example:

let answer = 42;
let answer_ptr = ptr.new(answer);

get

ptr.get() -> value

Returns the value pointed to, or nil or nil if it does not point to a variable. Can be used to modify to pointed variable

Example:

let answer = 42;
let answer_ptr = ptr.new(answer);
io.println(answer_ptr.get());
answer_ptr.get() = 12;
io.println(answer);
let nil_ptr = ptr.new();    
io.println(nil_ptr.get());

Gives the output:

42
12
(nil)

set

ptr.set(value) -> ptr

Makes the pointer point to value

Example:

let answer = 42;
let pi = 3.14;
let answer_ptr = ptr.new(answer);
io.println(answer_ptr.get());
answer_ptr.set(pi);
io.println(answer_ptr.get());

Gives the output:

42
3.14