Hello,
I'm trying to implement a struct where one of the fields is a reference and
therefore has bounded lifetime. The reason I would like it to be a
reference is to encourage sharing of the value in question as setup of said
value might be expensive. In my specific example, the value is a session
manager and opening said session is expensive.
I have come up with the following
```
trait MyTrait {
fn be_traity(&self);
}
struct MyImpl {
my_field: u32
}
impl MyTrait for MyImpl {
fn be_traity(&self) {}
}
struct MyStruct<'a> {
my_field: &'a MyTrait
}
impl<'a> MyStruct<'a> {
fn new<T: MyTrait>(my_field: &'a T) -> MyStruct {
MyStruct {
my_field: my_field
}
}
}
fn main() {
let my_field = MyImpl { my_field: 0 };
let my_struct = MyStruct::new(&my_field);
}
```
This fails to compile:
rust-lifetimes-with-references.rs:20:23: 20:31 error: value may contain
references; add `'static` bound
rust-lifetimes-with-references.rs:20 my_field: my_field
^~~~~~~~
This confuses me because "may contain references" is exactly what I want? I
want to assign it as a ref.. If I slap on a & in the assignment (for no
good reason other than being confused):
MyStruct {
my_field: &my_field
}
Then I get:
rust-lifetimes-with-references.rs:20:23: 20:32 error: failed to find an
implementation of trait MyTrait for &'a T
rust-lifetimes-with-references.rs:20 my_field: &my_field
---
I'm clearly doing something stupid but cannot find a reference example..
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