| --- |
| title: 'Provider' |
| --- |
| |
| A constructor for simple value objects, known as provider instances. |
| This value has a dual purpose: |
| |
| * It is a function that can be called to construct 'struct'-like values: |
| |
| ``` |
| DataInfo = provider() |
| d = DataInfo(x = 2, y = 3) |
| print(d.x + d.y) # prints 5 |
| ``` |
| |
| Note: Some providers, defined internally, do not allow instance creation |
| * It is a *key* to access a provider instance on a [Target](../builtins/Target) |
| |
| ``` |
| DataInfo = provider() |
| def _rule_impl(ctx) |
| ... ctx.attr.dep[DataInfo] |
| ``` |
| |
| Create a new `Provider` using the [provider](../globals/bzl#provider) function. |
