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How to avoid repetitive long generic constraints in Rust
The 2019 Stack Overflow Developer Survey Results Are In
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
The Ask Question Wizard is Live!
Data science time! April 2019 and salary with experienceIs it possible to automatically implement a trait for any tuple that is made up of types that all implement the trait?Is there a constraint that restricts my generic method to numeric types?How can foreign key constraints be temporarily disabled using T-SQL?How do I use reflection to call a generic method?How to create a generic array in Java?How to get a class instance of generics type THow is `last` allowed to be called for an Args value?How to implement a trait for a parameterized traitAvoiding PhantomData in a struct to enforce type constraintsIs it possible to return part of a struct by reference?Associated References types as Value Types
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I'm trying to make my own implementation of big integers (just for education). The implementation is generic by data type:
struct LongNum<T>
where T: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8>
values: Vec<T>,
powers: Vec<u8>,
radix: u8,
The problem is that I need to repeat this verbose constraint for T in all impls. It's too cumbersome.
I can make my own trait combining these constraints, like this:
trait LongNumValue: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8>
struct LongNum<T: LongNumValue>
values: Vec<T>,
powers: Vec<u8>,
radix: u8,
But in this case I have to add impls for this LongNumValue trait to all types which can be used in LongNum:
impl LongNumValue for u8
impl LongNumValue for u16
impl LongNumValue for u32
...
This means that if I don't add some type to this list of impls, the user of my crate will be unable to use this type for LongNum, even if this type is passes all constraints.
Is there any way to avoid writing long repetitive costraints without adding unnecessary restrictions to user?
generics rust constraints traits
asked Apr 8 at 7:56
Michael IlyinMichael Ilyin
13927
add a comment |
I'm trying to make my own implementation of big integers (just for education). The implementation is generic by data type:
struct LongNum<T>
where T: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8>
values: Vec<T>,
powers: Vec<u8>,
radix: u8,
The problem is that I need to repeat this verbose constraint for T in all impls. It's too cumbersome.
I can make my own trait combining these constraints, like this:
trait LongNumValue: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8>
struct LongNum<T: LongNumValue>
values: Vec<T>,
powers: Vec<u8>,
radix: u8,
But in this case I have to add impls for this LongNumValue trait to all types which can be used in LongNum:
impl LongNumValue for u8
impl LongNumValue for u16
impl LongNumValue for u32
...
This means that if I don't add some type to this list of impls, the user of my crate will be unable to use this type for LongNum, even if this type is passes all constraints.
Is there any way to avoid writing long repetitive costraints without adding unnecessary restrictions to user?
generics rust constraints traits
asked Apr 8 at 7:56
Michael IlyinMichael Ilyin
13927
1
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
Apr 8 at 8:06
add a comment |
I'm trying to make my own implementation of big integers (just for education). The implementation is generic by data type:
struct LongNum<T>
where T: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8>
values: Vec<T>,
powers: Vec<u8>,
radix: u8,
The problem is that I need to repeat this verbose constraint for T in all impls. It's too cumbersome.
I can make my own trait combining these constraints, like this:
trait LongNumValue: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8>
struct LongNum<T: LongNumValue>
values: Vec<T>,
powers: Vec<u8>,
radix: u8,
But in this case I have to add impls for this LongNumValue trait to all types which can be used in LongNum:
impl LongNumValue for u8
impl LongNumValue for u16
impl LongNumValue for u32
...
This means that if I don't add some type to this list of impls, the user of my crate will be unable to use this type for LongNum, even if this type is passes all constraints.
Is there any way to avoid writing long repetitive costraints without adding unnecessary restrictions to user?
generics rust constraints traits
asked Apr 8 at 7:56
Michael IlyinMichael Ilyin
13927
I'm trying to make my own implementation of big integers (just for education). The implementation is generic by data type:
struct LongNum<T>
where T: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8>
values: Vec<T>,
powers: Vec<u8>,
radix: u8,
The problem is that I need to repeat this verbose constraint for T in all impls. It's too cumbersome.
I can make my own trait combining these constraints, like this:
trait LongNumValue: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8>
struct LongNum<T: LongNumValue>
values: Vec<T>,
powers: Vec<u8>,
radix: u8,
But in this case I have to add impls for this LongNumValue trait to all types which can be used in LongNum:
impl LongNumValue for u8
impl LongNumValue for u16
impl LongNumValue for u32
...
This means that if I don't add some type to this list of impls, the user of my crate will be unable to use this type for LongNum, even if this type is passes all constraints.
Is there any way to avoid writing long repetitive costraints without adding unnecessary restrictions to user?
generics rust constraints traits
generics rust constraints traits
asked Apr 8 at 7:56
Michael IlyinMichael Ilyin
13927
asked Apr 8 at 7:56
Michael IlyinMichael Ilyin
13927
asked Apr 8 at 7:56
Michael IlyinMichael Ilyin
13927
asked Apr 8 at 7:56
Michael IlyinMichael Ilyin
13927
asked Apr 8 at 7:56
Michael IlyinMichael Ilyin
13927
13927
1
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
Apr 8 at 8:06
add a comment |
1
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
Apr 8 at 8:06
1
1
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
Apr 8 at 8:06
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
Apr 8 at 8:06
add a comment |
1 Answer
1
active
oldest
votes
You can add a blanket implementation:
impl<T> LongNumValue for T
where
T: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8>
answered Apr 8 at 8:20
starbluestarblue
45.6k1177138
add a comment |
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1 Answer
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oldest
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You can add a blanket implementation:
impl<T> LongNumValue for T
where
T: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8>
answered Apr 8 at 8:20
starbluestarblue
45.6k1177138
add a comment |
You can add a blanket implementation:
impl<T> LongNumValue for T
where
T: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8>
answered Apr 8 at 8:20
starbluestarblue
45.6k1177138
add a comment |
You can add a blanket implementation:
impl<T> LongNumValue for T
where
T: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8>
answered Apr 8 at 8:20
starbluestarblue
45.6k1177138
You can add a blanket implementation:
impl<T> LongNumValue for T
where
T: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8>
answered Apr 8 at 8:20
starbluestarblue
45.6k1177138
answered Apr 8 at 8:20
starbluestarblue
45.6k1177138
answered Apr 8 at 8:20
starbluestarblue
45.6k1177138
answered Apr 8 at 8:20
starbluestarblue
45.6k1177138
45.6k1177138
add a comment |
add a comment |
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You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
Apr 8 at 8:06