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Support tuple structs with #[derive(SystemParam)]
(#6957)
# Objective Currently, only named structs can be used with the `SystemParam` derive macro. ## Solution Remove the restriction. Tuple structs and unit structs are now supported. --- ## Changelog + Added support for tuple structs and unit structs to the `SystemParam` derive macro.
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parent
cf480d939a
commit
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2 changed files with 21 additions and 7 deletions
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@ -327,13 +327,14 @@ static SYSTEM_PARAM_ATTRIBUTE_NAME: &str = "system_param";
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#[proc_macro_derive(SystemParam, attributes(system_param))]
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pub fn derive_system_param(input: TokenStream) -> TokenStream {
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let ast = parse_macro_input!(input as DeriveInput);
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let fields = match get_named_struct_fields(&ast.data) {
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Ok(fields) => &fields.named,
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Err(e) => return e.into_compile_error().into(),
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let syn::Data::Struct(syn::DataStruct { fields: field_definitions, ..}) = ast.data else {
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return syn::Error::new(ast.span(), "Invalid `SystemParam` type: expected a `struct`")
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.into_compile_error()
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.into();
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};
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let path = bevy_ecs_path();
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let field_attributes = fields
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let field_attributes = field_definitions
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.iter()
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.map(|field| {
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(
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@ -368,9 +369,16 @@ pub fn derive_system_param(input: TokenStream) -> TokenStream {
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ignored_fields.push(field.ident.as_ref().unwrap());
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ignored_field_types.push(&field.ty);
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} else {
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fields.push(field.ident.as_ref().unwrap());
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let i = Index::from(i);
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fields.push(
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field
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.ident
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.as_ref()
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.map(|f| quote! { #f })
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.unwrap_or_else(|| quote! { #i }),
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);
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field_types.push(&field.ty);
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field_indices.push(Index::from(i));
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field_indices.push(i);
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}
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}
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@ -1662,5 +1662,11 @@ mod tests {
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}
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#[derive(SystemParam)]
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pub struct UnitParam {}
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pub struct UnitParam;
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#[derive(SystemParam)]
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pub struct TupleParam<'w, 's, R: Resource, L: FromWorld + Send + 'static>(
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Res<'w, R>,
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Local<'s, L>,
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);
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}
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