What is equivalent Java’s R (stands for Return) in rust?
For example, how can I write something like this in Rust?
<R> R accept(Visitor<R> visitor) {
return visitor.visitAssignExpr(this);
}
Relating to this post.
>Solution :
The equivalent in Rust would be:
fn accept<R>(&self, visitor: Visitor<R>) -> R {
visitor.visit_assign_expr(self)
}
The R is just an identifier; it doesn’t mean anything special and could’ve just as easily been T or Return. In Rust, the list of generics for a function go between the function name and the parameters. Note: I’ve made other changes in syntax and convention.
Beyond syntax, Rust’s generics may behave or be constrained differently than they are in Java. Consider reading through the Rust Book, it has a chapter on Generic Data Types.
See also: