# immutable_mirror_struct.to_mutable · Rell standard library · Chromia Docs (concept)

> pure function to_ mutable(): mutable_ mirror_ struct Convert this structure to a mutable version. Since 0.10.4

Source: https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/immutable_mirror_struct/to_mutable/

FUNCTION

# immutable\_mirror\_struct.to\_mutable

```signature
pure function to_mutable(): mutable_mirror_struct
```

Convert this structure to a mutable version.

Since 0.10.4

[View this page on docs.chromia.com](https://docs.chromia.com/pages/rell-stdlib/-rell%20-system%20-library/%5Broot%5D/immutable_mirror_struct/to_mutable.html)Generated API reference, mirrored from the live docs