#tuple #struct #enum #into #from


Convert structs and enums into tuples (of refs) and back - recursive, ignore fields

2 unstable releases

0.2.0 Nov 14, 2023
0.1.0 Sep 25, 2022

#1 in #tuples

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Used in 2 crates (via querio)


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🐍 convert a struct into a tuple and back
ðŸĶŽ convert an enum into a tuple and back
ðŸĶĒ get a tuple of (mut) references of fields of a struct
🐓 get a tuple of (mut) references of fields of an enum
ðŸĶĨ ignore specific fields
ðŸĶ† do it all recursively


🐠 add intuple to the dependencies in the Cargo.toml:

intuple = "0.2"

ðŸĶ€ use/import everything into rust:

use intuple::*;

ðŸĶš multiple ways to convert:

struct Struct {a:u32, b:u32, c:u32}

fn main(){
    // use std traits
    let strct: Struct = (3,2,1).into();
    let tuple = <(u32, u32, u32)>::from(strct);
    let strct = Struct::from((3,2,1));
    let tuple: (u32, u32, u32) = strct.into();
    // OR intuple trait
    let strct = Struct::from_tuple((3,2,1));
    let tuple = strct.into_tuple(); // or strct.intuple()
    // references
    let strct = Struct::from_tuple((3,2,1));    
    let tupref = strct.as_tuple_ref(); // (&u32,&u32,&u32)
    let tupref = strct.as_tuple_ref_mut(); // (&mut u32,&mut u32,&mut u32)
    *tupref.1 = 3;

Tuple Type

ðŸĶŠ access the resulting tuple types through a qualified path:

struct Nice {a:u32, b:u32, c:u32}
fn main(){
    let tup: <Nice as Intuple>::Tuple = (3,2,1);
    let tup: (u32, u32, u32) = (3,2,1); // <- same as above
    // reference tuple types
    let tup: <Nice as IntupleRef>::Tuple = (&3,&2,&1);
    let tup: (&u32, &u32, &u32) = (&3,&2,&1); // <- same as above
    // mut reference tuple types
    let tup: <Nice as IntupleRef>::TupleMut = (&mut 3,&mut 2,&mut 1);
    let tup: (&mut u32, &mut u32, &mut u32) = (&mut 3,&mut 2,&mut 1); // <- same as above


ðŸĶĨ ignore specific fields with #[igno]/#[ignore]
ðŸŧ or #[intuple(igno)]/#[intuple(ignore)]
🐞 ignored fields need to implement Default while converting to a struct

struct Struct {a:u32, #[igno] b:u32, c:u32}
fn main(){
    let strct = Struct::from((2,1));     
    // => {a:2, b:0, c:1}  
    let tuple: (u32, u32) = strct.into();
    // => (2, 1)


ðŸĶŠ convert recursively with #[recursive]/#[rcsv]
ðŸĶ or #[intuple(rcsv)]/#[intuple(recursive)]
🐞 recursive fields need to derive Intuple

struct Struct {a:u32, b:u32, c:u32}
struct Recursive {a:u32, #[recursive] b:Struct, c:u32}
fn main(){
    let rcsv: Recursive = (9,(3,2,1),8).into(); 
    // => Recursive{a:9, b:Struct{a:3,b:2,c:1}, c:8}
    let tuple: RecursiveIntuple = rcsv.into(); 
    // => (9,(3,2,1),8)

ðŸĶ† recursion also works with .as_tuple_ref() and as_tuple_ref_mut()

struct Struct {a:u32, b:u32, c:u32}
struct Recursive {a:u32, #[recursive] b:Struct, c:u32}
fn main(){
    let rcsv = Recursive::from((9,(3,2,1),8)); 
    let tuple = rcsv.as_tuple_ref(); 
    // => (&9,(&3,&2,&1),&8)


🙉 converting enums to tuples isn't as straight forward as structs, therefore two methods are implemented!

🐍 1. Positional

🐆 using Intuple - no additional enums or structs are generated
ðŸĒ field tuples are wrapped in an Option<>, which are inside another tuple
ðŸĶŽ the outer tuple has as many fields as there are enum variants
🐊 the required None variant will convert to (None,None,None,...)
🐉 any other variant will occupy a slot, depending on its position (None,Some(tuple),None,...)

// Positional
#[derive( Intuple, Debug )]
// enums require a 'None' variant
enum Enum { None, Unit, Unnamed(u32,u32), Another(u8,u8) }
fn main(){
    let enum = Enum::Unnamed(1,2); 
    let tuple = enum.as_tuple_ref(); 
    // => (None, Some((&1,&2)), None)
    let tuple = enum.into_tuple(); 
    // => (None, Some((1,2)), None)
    let enum = Enum::None; 
    let tuple = rcsv.into_tuple(); 
    // => (None,None,None)

ðŸĶŠ 2. Generated Tuple Enums

🐈 using IntupleEnum - three additional enums will be generated:
🐕 {EnumName}Intuple, {EnumName}IntupleRef and {EnumName}IntupleRefMut
ðŸĶ„ each of those will use the original variant names and contain a tuple
🐔 to set derives for them, use #[intuple(derive(...))]
⚠ to use them recursivly ANYWHERE, use #[recursive_enum] or #[rcsve]
ðŸĶĒ .into()/.from(..) are implemented, but the custom methods change to:
🐓 .from_tuple_enum(..), .into_tuple_enum(), .as_tuple_enum_ref() and .as_tuple_enum_ref_mut()

// Generated
#[derive( IntupleEnum, Debug )]
#[intuple(derive( Debug ))]
enum Enum { Unit, Unnamed(u32,u32), Another(u8,u8) }
fn main(){
    let enum = Enum::Unnamed(1,2); 
    let tuple = enum.as_tuple_enum_ref(); 
    // => EnumIntupleRef::Unnamed((&1,&2))
    let tuple = enum.into_tuple_enum(); 
    // => EnumIntupleRef::Unnamed((1,2))

Example: Serde - Thinking out of the box

ðŸĶ„ You could use serde without implementing Serialize/Deserialize
🐔 This only works with the positional enum tuples!

use intuple::*;

struct Named{a:u32, b:u32, c:u32, d:u32, e:u32, f:u32}

fn main(){
    let named = Named::from((1,2,3,4,5,6));
    let json = serde_json::to_string(&named.as_tuple_ref()).unwrap();
    println!("{}",json); //=> "[1,2,3,4,5,6]"

    let tuple = serde_json::from_str::<<Named as Intuple>::Tuple>(&json).unwrap();
    let named_again = Named::from(tuple);
    // named == named_again

More Information

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Licensed under either of Apache License, Version 2.0 or MIT license at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.


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