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 yesterday
Michael IlyinMichael Ilyin
13427
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 yesterday
Michael IlyinMichael Ilyin
13427
1
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
yesterday
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 yesterday
Michael IlyinMichael Ilyin
13427
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 yesterday
Michael IlyinMichael Ilyin
13427
asked yesterday
Michael IlyinMichael Ilyin
13427
asked yesterday
Michael IlyinMichael Ilyin
13427
asked yesterday
Michael IlyinMichael Ilyin
13427
asked yesterday
Michael IlyinMichael Ilyin
13427
13427
1
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
yesterday
add a comment |
1
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
yesterday
1
1
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
yesterday
You mean something similar to this? stackoverflow.com/questions/55553281/…
– hellow
yesterday
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 yesterday
starbluestarblue
45.6k1177138
add a comment |
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1 Answer
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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 yesterday
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 yesterday
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 yesterday
starbluestarblue
45.6k1177138
You can add a blanket implementation:
impl<T> LongNumValue for T
where
T: Integer + MulAssign + CheckedMul + CheckedAdd + Copy + From<u8> {}
answered yesterday
starbluestarblue
45.6k1177138
answered yesterday
starbluestarblue
45.6k1177138
answered yesterday
starbluestarblue
45.6k1177138
answered yesterday
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
yesterday