35 lines
1.3 KiB
Rust
35 lines
1.3 KiB
Rust
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use quote::quote;
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use syn::{parse_macro_input, DeriveInput};
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#[proc_macro_derive(RenderGraphLabel)]
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pub fn derive_render_graph_label(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
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let input = parse_macro_input!(input as DeriveInput);
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let (impl_generics, ty_generics, where_clause) = input.generics.split_for_impl();
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let type_ident = &input.ident;
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proc_macro::TokenStream::from(quote! {
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impl #impl_generics crate::render::graph::RenderGraphLabel for #type_ident #ty_generics #where_clause {
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fn rc_clone(&self) -> std::rc::Rc<dyn crate::render::graph::RenderGraphLabel> {
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std::rc::Rc::new(self.clone())
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}
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/* fn as_dyn(&self) -> &dyn crate::render::graph::RenderGraphLabel {
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&self
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}
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fn as_partial_eq(&self) -> &dyn PartialEq<dyn crate::render::graph::RenderGraphLabel> {
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self
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} */
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fn as_label_hash(&self) -> u64 {
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let tyid = ::std::any::TypeId::of::<Self>();
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let mut s = ::std::hash::DefaultHasher::new();
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::std::hash::Hash::hash(&tyid, &mut s);
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::std::hash::Hash::hash(self, &mut s);
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::std::hash::Hasher::finish(&s)
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}
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}
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})
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}
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