CODEWITHSUNDEEP
rustenumsmatch
Manbass
Manbass

Reputation: 67

Rename enum fields in match (rust)

I have a match block on enum, and one of it`s match cases contains another match block on the same enum. Something like this:

fn foo(&mut self, scenario: &mut Scenario) -> Result<&mut Self>
{
match self {
            Scenario::Step { attributes, .. } => {
                match scenario {
                    Scenario::Step { attributes,.. } => {

Is there any way to access both attributes field inside of the inner match? I see possibility to just return that field from the inner match block, but can it be handled in more beauty way?

Upvotes: 5

Views: 1833

Answers (2)

Netwave
Netwave

Reputation: 42678

You could match both of them at the same time in a tuple:

fn foo(&mut self, scenario: &mut Scenario) -> Result<&mut Self> {
    match (self, escenario) {
        (Scenario::Step { attributes, .. }, Scenario::Step { attributes: attributes2, .. }) => {}
    }
}

Upvotes: 1

isaactfa
isaactfa

Reputation: 6651

You can rename the matched variable like this:

fn foo(&mut self, scenario: &mut Scenario) -> Result<&mut Self>
{
match self {
            Scenario::Step { attributes: attrs1, .. } => {
                match scenario {
                    Scenario::Step { attributes: attrs2,.. } => {
                        // do something with attrs1 and attrs2

And even nicer, you could match on them in a tuple:

fn foo(&mut self, scenario: &mut Scenario) -> Result<&mut Self>
{
match (self, scenario) {
            (Scenario::Step { attributes: attrs1, .. }, Scenario::Step { attributes: attrs2,.. }) => {
                // do something with attrs1 and attrs2

Upvotes: 8

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