Move top-level files into concepts/

[learn-rust.git] / src / lib.rs

diff --git a/src/lib.rs b/src/lib.rs
deleted file mode 100644 (file)
index b7e5eb8..0000000
--- a/src/lib.rs
+++ /dev/null
@@ -1,110 +0,0 @@
-use std::fs::File;
-use std::io::prelude::*;
-use std::collections::HashMap;
-
-pub fn read_file(path: &str) -> Result<String, std::io::Error> {
-    let mut s = String::new();
-    File::open(path)?
-        .read_to_string(&mut s)?;
-    Ok(s)
-}
-
-// needs Copy trait, good for simple types
-pub fn largest<T: PartialOrd + Copy>(list: &[T]) -> T {
-    let mut result = list[0];
-    for &i in list {
-        if i > result {
-            result = i;
-        }
-    }
-    result
-}
-
-// expensive for large strings, don't use that
-pub fn largest_clone<T: PartialOrd + Clone>(list: &[T]) -> T {
-    let mut result = list[0].clone();
-    for i in list {
-        if *i > result {
-            result = i.clone();
-        }
-    }
-    result
-}
-
-// good for everything, but more expensive for simple types
-pub fn largest_ref<T: PartialOrd>(list: &[T]) -> &T {
-    let mut result = &list[0];
-    for i in list {
-        if i > result {
-            result = i;
-        }
-    }
-    result
-}
-
-pub fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
-    if x.len() > y.len() {
-        x
-    } else {
-        y
-    }
-}
-
-/// Wrap and cache an expensive calculation
-///
-/// This calls a closure just once for every distinct argument. Any subsequent
-/// call to `.value()` with the same argument uses the cached value.
-pub struct Cacher<T, A, V>
-where
-    T: Fn(A) -> V,
-    A: Eq + Copy + std::hash::Hash,
-    V: Copy,
-{
-    calc: T,
-    values: HashMap<A, V>,
-}
-
-impl<T, A, V> Cacher<T, A, V>
-where
-    T: Fn(A) -> V,
-    A: Eq + Copy + std::hash::Hash,
-    V: Copy,
-{
-    pub fn new(calc: T) -> Cacher<T, A, V> {
-        Cacher { calc, values: HashMap::new() }
-    }
-
-    pub fn value(&mut self, arg: A) -> V {
-        match self.values.get(&arg) {
-            Some(v) => *v,
-            None => {
-                let v = (self.calc)(arg);
-                self.values.insert(arg, v);
-                v
-            }
-        }
-    }
-}
-
-pub struct Counter5 {
-    count: u32
-}
-
-impl Counter5 {
-    pub fn new() -> Counter5 {
-        Counter5 { count: 0 }
-    }
-}
-
-impl Iterator for Counter5 {
-    type Item = u32;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        if self.count < 5 {
-            self.count += 1;
-            Some(self.count)
-        } else {
-            None
-        }
-    }
-}