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Add advanced_lifetimes example

This commit is contained in:
Timothy Warren 2019-02-07 12:28:51 -05:00
parent 6cf7aa9000
commit 13233d5eb1
6 changed files with 134 additions and 57 deletions
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1
.idea/misc.xml
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@ -37,6 +37,7 @@
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5
.idea/rust.iml
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@ -149,9 +149,14 @@
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133
.idea/workspace.xml
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@ -2,8 +2,6 @@
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@ -16,11 +14,28 @@
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@ -54,8 +69,6 @@
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@ -105,6 +118,8 @@
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@ -138,12 +153,12 @@
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@ -177,7 +192,7 @@
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@ -205,7 +220,7 @@
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@ -224,23 +239,13 @@
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<option name="command" value="run --package blog --bin blog" />
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@ -266,11 +271,21 @@
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@ -283,21 +298,15 @@
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@ -322,6 +331,12 @@
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7
advanced_lifetimes/Cargo.toml Normal file
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@ -0,0 +1,7 @@
[package]
name = "advanced_lifetimes"
version = "0.1.0"
authors = ["Timothy Warren <twarren@nabancard.com>"]
edition = "2018"
[dependencies]

26
advanced_lifetimes/src/lib.rs Normal file
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@ -0,0 +1,26 @@
struct Context<'s>(&'s str);
// 's : 'c tells Rust that the 's lifetime is tied to the 'c lifetime
struct Parser<'c, 's : 'c> {
context: &'c Context<'s>,
}
impl<'c, 's> Parser<'c, 's> {
fn parse(&self) -> Result<(), &'s str> {
Err(&self.context.0[1..])
}
}
fn parse_context(context: Context) -> Result<(), &str> {
Parser { context: &context }.parse()
}
struct Ref<'a, T: 'a>(&'a T);
#[cfg(test)]
mod tests {
#[test]
fn it_works() {
assert_eq!(2 + 2, 4);
}
}

19
advanced_lifetimes/src/main.rs Normal file
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@ -0,0 +1,19 @@
trait Red {}
struct Ball<'a> {
diameter: &'a i32,
}
impl<'a> Red for Ball<'a> {}
struct StrWrap<'a>(&'a str);
fn foo(string: &str) -> StrWrap<'_> { // Anonymous lifetime
StrWrap(string)
}
fn main() {
let num = 5;
let obj = Box::new(Ball { diameter: &num}) as Box<dyn Red>;
}