| <html devsite> |
| <head> |
| <meta name="project_path" value="/_project.yaml"> |
| <meta name="book_path" value="/versions/7.4.0/_book.yaml"> |
| </head> |
| <body> |
| |
| <h1 class="page-title" id="modules.Provider">Provider</h1> |
| |
| {% dynamic setvar source_file "src/main/java/com/google/devtools/build/lib/starlarkbuildapi/core/ProviderApi.java" %} |
| {% dynamic setvar version "7.4.0" %} |
| {% dynamic setvar original_path "/rules/lib/builtins/Provider" %} |
| {% include "_buttons.html" %} |
| <!-- {% raw %} --> |
| |
| A constructor for simple value objects, known as provider instances.<br>This value has a dual purpose: <ul> <li>It is a function that can be called to construct 'struct'-like values:<pre class="language-python">DataInfo = provider() |
| d = DataInfo(x = 2, y = 3) |
| print(d.x + d.y) # prints 5</pre> Note: Some providers, defined internally, do not allow instance creation </li> <li>It is a <i>key</i> to access a provider instance on a <a href="../builtins/Target.html">Target</a><pre class="language-python">DataInfo = provider() |
| def _rule_impl(ctx) |
| ... ctx.attr.dep[DataInfo]</pre> </li> </ul>Create a new <code>Provider</code> using the <a href="../globals/bzl.html#provider">provider</a> function. |
| |
| |
| |
| </body> |
| </html> |
| |
| <!-- {% endraw %} --> |
