Attribute macro

As explained in Idiomatic Rust

An attribute macro is a procedural macro attached to an existing item that can accept attribute arguments and generate replacement or additional code.

How Idiomatic Rust covers it

How deep it goes

Defines placement and argument support, but stops short of implementing an attribute macro.

Examples

Shows the attribute form #[MyAttribute] without a worked implementation.

What you can do after

Evaluate its fit by checking whether a macro should attach to an existing item and accept attribute arguments.

How it connects

Compares attribute macros with derive macros, function-like procedural macros, and procedural macros generally.

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Also explained in

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  Write Powerful Rust MacrosAn attribute macro is a Rust procedural macro that defines a custom attribute and replaces the annotated item with generated output.

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Related concepts

• procedural macrokind of · A procedural macro is a Rust macro implemented as a program that transforms an input token stream into generated code during compilation.
• derive macrocontrasts with · A Rust derive macro is an attribute that automatically generates implementations of specified traits or related functionality for a type.
• conditional compilationincludes · Conditional compilation selects source-code regions for inclusion or exclusion based on conditions evaluated during compilation or preprocessing.
• TokenStreamuses · TokenStream is a sequence of Rust source tokens used as input or output during procedural macro expansion and code generation.
• functionuses · A function is a callable program unit that performs an operation, may accept inputs, and can produce a result or side effect.

This explainer was generated by Manning's knowledge graph from the text of Idiomatic Rust. The section links point to the parts of the book it draws on.