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Add advanced_functions example

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This commit is contained in:
Timothy Warren 2019-02-11 09:34:46 -05:00
parent 9a23a0ce9b
commit 59bc706d0a
5 changed files with 105 additions and 42 deletions
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1
.idea/misc.xml generated
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@ -40,6 +40,7 @@
<cargoProject FILE="$PROJECT_DIR$/advanced_lifetimes/Cargo.toml" />
<cargoProject FILE="$PROJECT_DIR$/advanced_traits/Cargo.toml" />
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5
.idea/rust.iml generated
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@ -161,9 +161,14 @@
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<excludeFolder url="file://$MODULE_DIR$/add/adder/target" />
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<excludeFolder url="file://$MODULE_DIR$/advanced_lifetimes/target" />
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<excludeFolder url="file://$MODULE_DIR$/advanced_types/target" />

96
.idea/workspace.xml generated
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@ -15,10 +15,18 @@
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@ -103,6 +110,7 @@
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@ -112,7 +120,7 @@
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@ -159,12 +167,12 @@
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@ -175,7 +183,7 @@
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@ -203,7 +211,7 @@
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@ -222,6 +230,16 @@
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<option name="channel" value="DEFAULT" />
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@ -262,16 +280,6 @@
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<option name="allFeatures" value="false" />
<option name="nocapture" value="false" />
<option name="backtrace" value="SHORT" />
<option name="workingDirectory" value="file://$PROJECT_DIR$/advanced_lifetimes" />
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<option name="TEST_OBJECT" value="class" />
<option name="WORKING_DIRECTORY" value="$MODULE_DIR$" />
@ -281,11 +289,11 @@
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<item itemvalue="Cargo Command.Run advanced_functions" />
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<item itemvalue="Cargo Command.Run advanced_lifetimes" />
<item itemvalue="Cargo Command.Test lib::tests" />
<item itemvalue="Cargo Command.Test tests::it_works" />
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7
advanced_functions/Cargo.toml Normal file
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@ -0,0 +1,7 @@
[package]
name = "advanced_functions"
version = "0.1.0"
authors = ["Timothy Warren <twarren@nabancard.com>"]
edition = "2018"
[dependencies]

38
advanced_functions/src/main.rs Normal file
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@ -0,0 +1,38 @@
fn add_one(x: i32) -> i32 {
x + 1
}
/// A function with a function pointer argument
fn do_twice(f: fn(i32) -> i32, arg: i32) -> i32 {
f(arg) + f(arg)
}
#[derive(Debug)]
enum Status {
Value(u32),
Stop,
}
fn returns_closure() -> Box<dyn Fn (i32) -> i32> {
Box::new(|x| x + 1)
}
fn main() {
let answer = do_twice(add_one, 5);
println!("The answer is: {}", answer);
// Tuple Structs set up via function pointers
let list_of_statuses: Vec<Status> =
(0u32..20)
.map(Status::Value)
.collect();
println!("List of statuses: {:?}", list_of_statuses);
let increment = returns_closure();
let x = 5;
let y = increment(x);
println!("The returned closure returns: {}", y);
}