Rename folder: primitives/sr-primitives -> primitives/runtime (#4280)

* primitives/sr-primitives -> primitives/runtime

* update

substrate/primitives/runtime/src/generic/mod.rs

@@ -0,0 +1,62 @@
+// Copyright 2017-2019 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate 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.
+
+// Substrate 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 Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+// tag::description[]
+//! Generic implementations of Extrinsic/Header/Block.
+// end::description[]
+
+mod unchecked_extrinsic;
+mod era;
+mod checked_extrinsic;
+mod header;
+mod block;
+mod digest;
+#[cfg(test)]
+mod tests;
+
+pub use self::unchecked_extrinsic::{UncheckedExtrinsic, SignedPayload};
+pub use self::era::{Era, Phase};
+pub use self::checked_extrinsic::CheckedExtrinsic;
+pub use self::header::Header;
+pub use self::block::{Block, SignedBlock, BlockId};
+pub use self::digest::{
+	Digest, DigestItem, DigestItemRef, OpaqueDigestItemId
+};
+
+use crate::codec::Encode;
+use rstd::prelude::*;
+
+fn encode_with_vec_prefix<T: Encode, F: Fn(&mut Vec<u8>)>(encoder: F) -> Vec<u8> {
+	let size = ::rstd::mem::size_of::<T>();
+	let reserve = match size {
+		0..=0b00111111 => 1,
+		0..=0b00111111_11111111 => 2,
+		_ => 4,
+	};
+	let mut v = Vec::with_capacity(reserve + size);
+	v.resize(reserve, 0);
+	encoder(&mut v);
+
+	// need to prefix with the total length to ensure it's binary compatible with
+	// Vec<u8>.
+	let mut length: Vec<()> = Vec::new();
+	length.resize(v.len() - reserve, ());
+	length.using_encoded(|s| {
+		v.splice(0..reserve, s.iter().cloned());
+	});
+
+	v
+}