Add advanced_lifetimes example
This commit is contained in:
Timothy Warren
parent
6cf7aa9000
commit
13233d5eb1
1
.idea/misc.xml
generated
1
.idea/misc.xml
generated
@ -37,6 +37,7 @@
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5
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5
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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="channel" value="DEFAULT" />
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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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<option name="command" value="test --package advanced_lifetimes --lib tests" />
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<option name="workingDirectory" value="file://$PROJECT_DIR$/advanced_lifetimes" />
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<option name="channel" value="DEFAULT" />
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<option name="command" value="test --package advanced_lifetimes --lib tests::it_works -- --exact" />
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<option name="backtrace" value="SHORT" />
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<option name="workingDirectory" value="file://$PROJECT_DIR$/advanced_lifetimes" />
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@ -283,21 +298,15 @@
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</configuration>
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<item itemvalue="Cargo Command.Run advanced_lifetimes" />
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<item itemvalue="Cargo Command.Run unsafe_blocks" />
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<item itemvalue="Cargo Command.Run pattern_matching" />
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<item itemvalue="Cargo Command.Run blog" />
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@ -322,6 +331,12 @@
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@ -344,7 +359,7 @@
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@ -358,24 +373,6 @@
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7
advanced_lifetimes/Cargo.toml
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7
advanced_lifetimes/Cargo.toml
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@ -0,0 +1,7 @@
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[package]
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name = "advanced_lifetimes"
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version = "0.1.0"
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authors = ["Timothy Warren <twarren@nabancard.com>"]
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edition = "2018"
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[dependencies]
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26
advanced_lifetimes/src/lib.rs
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26
advanced_lifetimes/src/lib.rs
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@ -0,0 +1,26 @@
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struct Context<'s>(&'s str);
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// 's : 'c tells Rust that the 's lifetime is tied to the 'c lifetime
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struct Parser<'c, 's : 'c> {
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context: &'c Context<'s>,
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}
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impl<'c, 's> Parser<'c, 's> {
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fn parse(&self) -> Result<(), &'s str> {
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Err(&self.context.0[1..])
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}
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}
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fn parse_context(context: Context) -> Result<(), &str> {
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Parser { context: &context }.parse()
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}
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struct Ref<'a, T: 'a>(&'a T);
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#[cfg(test)]
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mod tests {
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#[test]
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fn it_works() {
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assert_eq!(2 + 2, 4);
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}
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}
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19
advanced_lifetimes/src/main.rs
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19
advanced_lifetimes/src/main.rs
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@ -0,0 +1,19 @@
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trait Red {}
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struct Ball<'a> {
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diameter: &'a i32,
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}
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impl<'a> Red for Ball<'a> {}
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struct StrWrap<'a>(&'a str);
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fn foo(string: &str) -> StrWrap<'_> { // Anonymous lifetime
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StrWrap(string)
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}
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fn main() {
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let num = 5;
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let obj = Box::new(Ball { diameter: &num}) as Box<dyn Red>;
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}
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||||
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