[英]Only accept primitive types in a Rust Generic
Is there a way I can have a Rust Generic only accept primitive types? 有没有办法让Rust Generic只接受原始类型? I want to later iterate over the bits in the value, and I understand that that's only possible with primitive types.
我想稍后迭代值中的位,我明白这只能用于原始类型。
struct MyStruct<T> {
my_property: T // my_property HAS to be a primitive type
}
I believe the closest thing you can get is Primitive
trait which is implemented for in-built numeric types. 我相信你能得到的最接近的东西是为内置数字类型实现的
Primitive
特征。 It is a combination of several other numerical traits, which, in the end, allows for bit-fiddling with the values. 它是几个其他数字特征的组合,最终允许对这些值进行比特摆弄。 You will also probably need to add
BitAnd
/ BitOr
/etc. 您可能还需要添加
BitAnd
/ BitOr
/ BitOr
traits, because Primitive
only does not seem to allow these operations: traits,因为
Primitive
似乎不允许这些操作:
fn iter_bits<T: Primitive+BitAnd<T, T>+BitOr<T, T>>(x: T) { /* whatever */ }
Since you seem to have custom requirements, you could use a custom trait with the specific functionality you need, eg 由于您似乎有自定义要求,因此您可以使用具有所需特定功能的自定义特征,例如
trait BitIterate {
/// Calls `f` on each bit of `self`, passing the index and the value.
fn each_bit(&self, f: |uint, bool|);
}
impl BitIterate for u8 { ... }
impl BitIterate for u16 { ... }
// etc... could be done with a macro
// a non-primitive type which has a sensible way to iterate over bits
impl BitIterate for std::collections::Bitv { ... }
(That's one interpretation of "iterate over bits" anyway.) (无论如何,这是“迭代比特”的一种解释。)
Then, functions using MyStruct
and needing iterable bits would use something like 然后,使用
MyStruct
并需要可迭代位的函数将使用类似的东西
fn print_bits<T: BitIterate>(x: MyStruct<T>) {
x.my_property.each_bit(|index, bit_value| {
println!("bit #{} is {}", index, bit_value);
})
}
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