Pointers and references: Difference between revisions

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END Sum;</lang>

=={{header|~~Nimrod~~}}==

=={{header|Nim}}==

There are two types of pointers in ~~Nimrod~~. Safe, garbage-collected references and unsafe pointers.

There are two types of pointers in Nim. Safe, garbage-collected references and unsafe pointers.

Create a safe reference:

<lang ~~nimrod~~>type Foo = ref object

<lang nim>type Foo = ref object

x, y: float

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Accessing the reference:

When accessing values the dereference operator [] can be left out:

<lang ~~nimrod~~>echo f[].x

<lang nim>echo f[].x

f[].y = 12

echo f.y

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Create an (unsafe) pointer to an int variable:

<lang ~~nimrod~~>var x = 3

<lang nim>var x = 3

var p = addr x</lang>

Access the integer variable through the pointer:

<lang ~~nimrod~~>echo p[]

<lang nim>echo p[]

p[] = 42</lang>

Change the pointer to refer to another object:

<lang ~~nimrod~~>var y = 12

<lang nim>var y = 12

p = addr y</lang>

Change the pointer to not point to any object:

=={{header|OCaml}}==