How to avoid repetitive long generic constraints in RustIs it possible to automatically implement a trait for...
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How to avoid repetitive long generic constraints in Rust
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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 21 hours ago
Michael IlyinMichael Ilyin
12426
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 21 hours ago
Michael IlyinMichael Ilyin
12426
1
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
21 hours ago
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 21 hours ago
Michael IlyinMichael Ilyin
12426
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 21 hours ago
Michael IlyinMichael Ilyin
12426
asked 21 hours ago
Michael IlyinMichael Ilyin
12426
asked 21 hours ago
Michael IlyinMichael Ilyin
12426
asked 21 hours ago
Michael IlyinMichael Ilyin
12426
asked 21 hours ago
Michael IlyinMichael Ilyin
12426
12426
1
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
21 hours ago
add a comment |
1
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
21 hours ago
1
1
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
21 hours ago
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
21 hours ago
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 21 hours ago
starbluestarblue
45.6k1177138
add a comment |
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1 Answer
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active
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 21 hours ago
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 21 hours ago
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 21 hours ago
starbluestarblue
45.6k1177138
You can add a blanket implementation:
impl<T> LongNumValue for T
where
T: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8> {}
answered 21 hours ago
starbluestarblue
45.6k1177138
answered 21 hours ago
starbluestarblue
45.6k1177138
answered 21 hours ago
starbluestarblue
45.6k1177138
answered 21 hours ago
starbluestarblue
45.6k1177138
45.6k1177138
add a comment |
add a comment |
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1
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
21 hours ago