Programming-Idioms

Idiom

# 209 Type with automatic deep deallocation

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Lead paragraph

Declare a type _t which contains a string _s and an integer array _n with variable size, and allocate a variable _v of type _t. Allocate _v.s and _v._n  and set them to the values "Hello, world!" for _s and [1,4,9,16,25], respectively. Deallocate _v, automatically deallocating  _v._s and _v._n (no memory leaks).

Implementation

Language

Python

Added by

Last edited by

Imports

Code

class T:
    def __init__(self, s, n):
        self.s = s
        self.n = n
        return

v = T('hello world', [1, 4,  9, 16, 25])
del v

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Original attribution URL

Online demo

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Implementation edit is for fixing errors and enhancing with metadata.

Instead of changing the code of the snippet, consider creating another Python implementation.

Other implementations

  type t
    character(len=:), allocatable :: c
    integer, dimension(:), allocatable :: n
  end type t
  type(t), allocatable :: v

  allocate (v)
  v%s = 'Hello, world!'
  v%n = [1,4,9,16,25]

  deallocate (v)

use Moops;

class T {
    has 's', is => 'ro', isa => Str;
    has 'n', is => 'ro', isa => ArrayRef[Int];
}

{
    my $v = T->new(s => 'Hello, world!', n => [1,4,9,16,25]);
    # deallocation happens at closing brace, see explanation
}

type
  TDynIntArray = array of integer;
  TT = record
    s: string;
    n: TDynIntArray;
  end;
  PTT = ^TT;

var
  v: PTT;
begin
  v := New(PTT);
  v^.s := 'Hello world';
  v^.n := TDynIntArray.Create(1,4,9,16,25);
  Dispose(v);
end.

T = Struct.new(:s, :n)
v = T.new("Hello, world", [1, 4, 9, 16, 25])
v = nil

struct T {
	s: String,
	n: Vec<usize>,
}

fn main() {
	let v = T {
		s: "Hello, world!".into(),
		n: vec![1,4,9,16,25]
	};
}

type t struct {
	s string
	n []int
}

v := t{
	s: "Hello, world!",
	n: []int{1, 4, 9, 16, 25},
}

Demo

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