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# hololink::module::UNRELEASED

> Value of an interface's release_version when no release has published it yet.

Value of an interface's `release_version` when no release has published it yet.

```cpp showLineNumbers={false}
constexpr const char * hololink::module::UNRELEASED = "unreleased"
```

Every interface reachable through the service locator declares, next to its `type_id`:

Registering a service that doesn't include a release_version field will lead to a compiler error. This release version normally includes a string that indicates when that interface was frozen (e.g. "2.7.0"), but two other values are available:

* UNRELEASED is provided to circumvent the compiler error that occurs when no release_version is declared. This value is not allowed to appear with any interface definitions included in an official release of this code.
* TEST_ONLY is available for interfaces that are only allowed to be used in test code; these do not follow the backward compatible rules that application-facing services do.

## Example

```cpp showLineNumbers={false}
static constexpr const char* release_version = ...;
```