Documentation.

substrate/wasm-runtime/polkadot/src/support/statichex.rs

@@ -1,6 +1,26 @@
+// Copyright 2017 Parity Technologies (UK) Ltd.
+// This file is part of Polkadot.
+
+// Polkadot is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Polkadot is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Interpret a static string of hex as a desired type.
+
 use rustc_hex::FromHex;
 
+/// Trait to allow conversion from a static hex string to an instance.
 pub trait StaticHexConversion: Sized {
+	/// Convert the static str into Self. Use just like `From::from`.
 	fn from_static_hex(hex: &'static str) -> Self;
 }
 
@@ -18,7 +38,10 @@ macro_rules! impl_sizes {
 
 impl_sizes!(1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 24, 28, 32, 40, 48, 56, 64, 80, 96, 112, 128);
 
+/// Trait to allow converting from itself (only implemented for a static str) into some useful
+/// type (which must implement `StaticHexConversion`).
 pub trait StaticHexInto {
+	/// Convert self (i.e. a static str) into the appropriate type. Use just like `Into::into`.
 	fn convert<T: StaticHexConversion>(self) -> T;
 }