You can make everything read-only by default, and if you need non-read-only, you... | Hacker News

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		Thorrez 50 days ago \| parent \| context \| favorite \| on: John Carmack on mutable variables You can make everything read-only by default, and if you need non-read-only, you use "mutable".

alcover 50 days ago [–]

You need two keywords. One for assignability and one for writability :

    const ptr;  // can't reassign, can't write-through (if r/o by default)
    const mut ptr;  // can write

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