replace std by core and alloc

src/lib.rs

@@ -2,20 +2,23 @@
 //!
 //! See the [`LinearMap`](struct.LinearMap.html) type for details.
 
+#![no_std]
 #![deny(missing_docs)]
 
+extern crate alloc;
+
 // Optional Serde support
 #[cfg(feature = "serde_impl")]
 pub mod serde;
 pub mod set;
 
-use std::borrow::Borrow;
-use std::fmt::{self, Debug};
-use std::iter;
-use std::mem;
-use std::ops;
-use std::slice;
-use std::vec;
+use alloc::vec::{self, Vec};
+use core::borrow::Borrow;
+use core::fmt::{self, Debug};
+use core::iter;
+use core::mem;
+use core::ops;
+use core::slice;
 
 use self::Entry::{Occupied, Vacant};
 
@@ -79,7 +82,9 @@ pub struct LinearMap<K, V> {
 impl<K: Eq, V> LinearMap<K, V> {
     /// Creates an empty map. This method does not allocate.
     pub fn new() -> Self {
-        LinearMap { storage: vec![] }
+        LinearMap {
+            storage: Vec::new(),
+        }
     }
 
     /// Creates an empty map with the given initial capacity.

src/serde.rs

@@ -16,8 +16,8 @@ use self::serde::de::{Error, MapAccess, SeqAccess, Visitor};
 use self::serde::ser::{SerializeMap, SerializeSeq};
 use self::serde::{Deserialize, Deserializer, Serialize, Serializer};
 
-use std::fmt;
-use std::marker::PhantomData;
+use core::fmt;
+use core::marker::PhantomData;
 
 impl<K, V> Serialize for LinearMap<K, V>
 where

src/set.rs

@@ -2,10 +2,11 @@
 //!
 //! See the [`LinearSet`](struct.LinearSet.html) type for details.
 
-use std::borrow::Borrow;
-use std::fmt;
-use std::iter::{Chain, FromIterator};
-use std::ops::{BitAnd, BitOr, BitXor, Sub};
+use alloc::vec::Vec;
+use core::borrow::Borrow;
+use core::fmt;
+use core::iter::{Chain, FromIterator};
+use core::ops::{BitAnd, BitOr, BitXor, Sub};
 
 use super::{Keys, LinearMap};
 
@@ -574,13 +575,13 @@ where
 
 impl<K: Eq> From<LinearSet<K>> for Vec<K> {
     fn from(other: LinearSet<K>) -> Self {
-        unsafe { std::mem::transmute(other) }
+        unsafe { core::mem::transmute(other) }
     }
 }
 
 impl<K: Eq> From<Vec<K>> for LinearSet<K> {
     fn from(other: Vec<K>) -> Self {
-        unsafe { std::mem::transmute(other) }
+        unsafe { core::mem::transmute(other) }
     }
 }