derive_util

derive_util provides tools for derive macros.

struct visitor

The struct visitor provides a method that dispatches over the type of struct. It is up to the implementor to implement for named-fields, unnamed-fields, and the unit struct.

To override named fields, declare method [StructVisitor::visitstructnamed_fields].

ignore fn visit_struct_named_fields( &mut self, ty_name: &syn::Ident, ds: &syn::DataStruct, fields: &syn::FieldsNamed, ) -> Self::Output;

To override unnamed fields, declare method [StructVisitor::visitstructunnamed_fields].

ignore fn visit_struct_unnamed_fields( &mut self, ty_name: &syn::Ident, ds: &syn::DataStruct, fields: &syn::FieldsUnnamed, ) -> Self::Output;

To override the unit struct, declare method [StructVisitor::visitstructunit].

ignore fn visit_struct_unit(&mut self, _ty_name: &syn::Ident, _ds: &syn::DataStruct) -> Self::Output;

enum visitor

To override the struct with named fields, declare method [EnumVisitor::visitenumvariantnamedfield].

ignore fn visit_enum_variant_named_field( &mut self, ty_name: &syn::Ident, de: &syn::DataEnum, variant: &syn::Variant, fields: &syn::FieldsNamed, ) -> Self::VariantOutput;

To override the struct with unnamed fields, declare method [EnumVisitor::visitenumvariantunnamedfield].

ignore fn visit_enum_variant_unnamed_field( &mut self, ty_name: &syn::Ident, de: &syn::DataEnum, variant: &syn::Variant, fields: &syn::FieldsUnnamed, ) -> Self::VariantOutput;

To override the unit enum, declare method [EnumVisitor::visitenumvariant_unit].

ignore fn visit_enum_variant_unit( &mut self, ty_name: &syn::Ident, de: &syn::DataEnum, variant: &syn::Variant, ) -> Self::VariantOutput;

Each variant returns Self::VariantOutput. Combine these outputs into one Self::Output.

ignore fn combine_variants( &mut self, ty_name: &syn::Ident, de: &syn::DataEnum, variants: &[Self::VariantOutput], ) -> Self::Output;

Status

Maintenance track. The library is considered stable and will be put into maintenance mode if unchanged for one year. This library was last updated 2023-09-23.

Scope

This library will provide visitors for the core rust data types for use in derive macros.

Warts

• The library is not complete enough to be used in prototk from which it was derived.

Documentation

The latest documentation is always available at docs.rs.