[英]Generic functions in Rust
I would like create shared library (plugin) with generic function.我想创建具有通用功能的共享库(插件)。 T can be : u8, u16, u32, float, i8, i16, i32.
T可以是:u8、u16、u32、浮点数、i8、i16、i32。
pub struct Api {}
impl Api {
pub fn write_to_slave<T>(&self, id: u32, value: T)
{
println!("write to slave id : {}, value: {}", id, value);
}
}
Error:错误:
|
18 | pub fn write_to_slave<T>(&self, id: u32, value: T)
| - help: consider restricting this bound: `T: std::fmt::Display`
19 | {
20 | println!("write to slave id : {}, value: {}", id, value);
| ^^^^^ `T` cannot be formatted with the default formatter
|
= help: the trait std::fmt::Display is not implemented for T
= note: in format strings you may be able to use {:?} (or {:#?} for pretty-print) instead
= note: required by std::fmt::Display::fmt```
As the commenter mentioned.正如评论者所提到的。 You need to specify a trait bound on your generic type T, see below.
您需要在泛型类型 T 上指定一个 trait bound,见下文。 This requires that the type T implements the Display trait.
这要求类型 T 实现 Display trait。 Here is a link to the Rust docs for this topic.
这是指向该主题的 Rust 文档的链接。
pub struct Api {}
impl Api {
pub fn write_to_slave<T: Display>(&self, id: u32, value: T)
{
println!("write to slave id : {}, value: {}", id, value);
}
}
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