Implement support for no_std

* Implement support for no_std

* Disable no_std in doctests on stable Rust

See #1 (comment).

* Rename `alloc` import to `std`

This is to avoid confusion between link docs and regular types.

Co-authored-by: Ingvar Stepanyan <[email protected]>

Author: CryZe

Cargo.toml

@@ -6,7 +6,7 @@ edition = "2018"
 license = "MIT"
 description = "Copy-on-write string utilities for Rust"
 repository = "https://github.com/RReverser/cow-utils-rs"
-categories = ["text-processing"]
+categories = ["no-std", "text-processing"]
 keywords = ["string", "str", "text", "cow"]
 readme = "README.md"
 

src/lib.rs

@@ -1,6 +1,14 @@
+// Disable no_std in doctests on stable Rust.
+// See https://github.com/RReverser/cow-utils-rs/pull/1#issuecomment-586973518.
+#![cfg_attr(any(not(doctest), feature = "nightly"), no_std)]
 #![cfg_attr(feature = "nightly", feature(pattern))]
 
-use std::borrow::Cow;
+extern crate alloc as std;
+
+use std::{
+    borrow::{Cow, ToOwned},
+    string::String,
+};
 
 /// This trait is a shim for the required functionality
 /// normally provided directly by [`std::str::pattern::Pattern`]