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When I try to declare a struct inside of another struct:
struct Test { struct Foo {} } The compiler complains:
error: expected identifier, found keyword `struct` --> src/lib.rs:2:5 | 2 | struct Foo {} | ^^^^^^ expected identifier, found keyword help: you can escape reserved keywords to use them as identifiers | 2 | r#struct Foo {} | ^^^^^^^^ error: expected `:`, found `Foo` --> src/lib.rs:2:12 | 2 | struct Foo {} | ^^^ expected `:` I could not find any documentation in either direction; are nested structs even supported in Rust?
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Structs in Rust come in three flavors: Structs with named fields, tuple structs, and unit structs. Regular structs are the most commonly used. Each field defined within them has a name and a type, and once defined can be accessed using example_struct. field syntax.
Rust uses a feature called traits, which define a bundle of functions for structs to implement. One benefit of traits is you can use them for typing. You can create functions that can be used by any structs that implement the same trait.
We create an instance by stating the name of the struct and then add curly brackets containing key: value pairs, where the keys are the names of the fields and the values are the data we want to store in those fields. We don't have to specify the fields in the same order in which we declared them in the struct.
In rust we do not create objects itself, we call them instances. To create a instance you just use the struct name and a pair of {}, inside you put the name of the fields with values.
No, they are not supported. You should use separate struct declarations and regular fields:
struct Foo {} struct Test { foo: Foo, } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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