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Decltype

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Bradlee Speice 2020-08-28 13:30:15 -04:00
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_posts/2020-08-05-static-polymorphism.md
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@ -343,3 +343,10 @@ mostly please just use concepts.
Worth acknowledging that C++ can do interesting things with `protected`, `friend`, and others, that
Rust can't. However, Rust can limit trait implementations to current crate ("sealed traits"), where
C++ concepts are purely duck typing.
# decltype and compiler-named types
Rust has some types named by the compiler, but inaccessible in traits; can't return `impl SomeTrait`
from traits. Can return `impl Future` from free functions and structs, but traits can't use
compiler-generated types (associated types still need to name the type). C++ doesn't appear to have
the same restrictions.