diff options
Diffstat (limited to 'advanced/adv-lifetimes/src')
-rw-r--r-- | advanced/adv-lifetimes/src/main.rs | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/advanced/adv-lifetimes/src/main.rs b/advanced/adv-lifetimes/src/main.rs new file mode 100644 index 0000000..755baf4 --- /dev/null +++ b/advanced/adv-lifetimes/src/main.rs @@ -0,0 +1,36 @@ +fn main() { + let num = 5; + + let obj = Box::new(Ball { diameter: &num }) as Box<dyn Red>; +} + +struct Context<'s>(&'s str); + +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() +} + +trait Red { } + +struct Ball<'a> { + diameter: &'a i32, +} + +impl<'a> Red for Ball<'a> { } + +struct StrWrap<'a>(&'a str); + +fn foo(string: &str) -> StrWrap<'_> { + StrWrap(string) +} + |