Programming-Idioms

Idiom

# 207 Allocate a list that is automatically deallocated

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Allocate a list _a containing _n elements (_n assumed to be too large for a stack) that is automatically deallocated when the program exits the scope it is declared in.

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Other implementations

  integer, dimension(:), allocatable :: a
  allocate (a(n))

a := make([]T, n)

Demo

var
  a: array of some_type;
...
  SetLength(a, n);
...

{
    my @a = (undef) x $n;
    # scope ends at closing brace
}

def func():
    a = [0] * n
    # local variable automatically deallocated at end of function
    return

a = Array.new(n)

let a = vec![0; n];

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