# mutable_mirror_struct.to_immutable · Rell standard library · Chromia Docs (concept)

> pure function to_ immutable(): immutable_ mirror_ struct Convert this struct to an immutable version. Since 0.10.4

Source: https://docs.chromia.com/pages/rell-stdlib/-rell-system-library/root/mutable_mirror_struct/to_immutable/

FUNCTION

# mutable\_mirror\_struct.to\_immutable

```signature
pure function to_immutable(): immutable_mirror_struct
```

Convert this struct to an immutable 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/mutable_mirror_struct/to_immutable.html)Generated API reference, mirrored from the live docs