Add no_std support, by adding an `std` feature (#281)

To make the library work as `no_std` we add an `std` feature which
is on by default. When it is off, we compile as `no_std` and make
parts of the API that require `std::io` conditional on the `std`
feature.

1 files changed, 7 insertions, 1 deletions

diff --git a/src/buf/mod.rs b/src/buf/mod.rs
index cd7373e..15e032d 100644
--- a/src/buf/mod.rs
+++ b/src/buf/mod.rs
@@ -20,15 +20,21 @@ mod buf_impl;
 mod buf_mut;
 mod chain;
 mod iter;
-mod reader;
 mod take;
 mod vec_deque;
+
+// When std::io::Reader etc. traits are not available, skip these
+#[cfg(feature = "std")]
+mod reader;
+#[cfg(feature = "std")]
 mod writer;
 
 pub use self::buf_impl::Buf;
 pub use self::buf_mut::BufMut;
 pub use self::chain::Chain;
 pub use self::iter::IntoIter;
+#[cfg(feature = "std")]
 pub use self::reader::Reader;
 pub use self::take::Take;
+#[cfg(feature = "std")]
 pub use self::writer::Writer;