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Lifetime (question (when to need to specify lifetime parameter ? (When…
Lifetime
question
why lifetime annotation ?
generic lifetime?
when to need to specify lifetime parameter ?
When returning a reference from a function
Thinking in Terms of Lifetimes
lifetime syntax is about connecting the lifetimes of various parameters and return values of functions.
refer to a value created within this function
If return value reference not related to parameters references.
In this case, the best fix would be to return an owned data type rather than a reference so the calling function is then responsible for cleaning up the value. ??????
Lifetime Annotation
Lifetime Annotation Syntax
&i32
&'a i32
&'a mut i32
can not determine reference borrow from where
add generic lifetime parameters
Lifetime Annotations in Function Signatures
Return reference depend on parameters reference
Dependent parameters reference must be valid in the scope
Preventing Dangling References with Lifetimes
The Borrow Checker
Generic Lifetimes in Functions
Lifetime Annotations in Struct Definitions
Lifetime Annotations in Method Definitions
The Static Lifetime
Generic Type Parameters, Trait Bounds, and Lifetimes Together