feat: initialize Kurdistan SDK - independent fork of Polkadot SDK

substrate/client/utils/src/id_sequence.rs

@@ -0,0 +1,53 @@
+// This file is part of Substrate.
+
+// Copyright (C) Parity Technologies (UK) Ltd.
+// SPDX-License-Identifier: Apache-2.0
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Produce opaque sequential IDs.
+
+/// A Sequence of IDs.
+#[derive(Debug, Default)]
+// The `Clone` trait is intentionally not defined on this type.
+pub struct IDSequence {
+	next_id: u64,
+}
+
+/// A Sequential ID.
+///
+/// Its integer value is intentionally not public: it is supposed to be instantiated from within
+/// this module only.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
+pub struct SeqID(u64);
+
+impl std::fmt::Display for SeqID {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		write!(f, "{}", self.0)
+	}
+}
+
+impl IDSequence {
+	/// Create a new ID-sequence.
+	pub fn new() -> Self {
+		Default::default()
+	}
+
+	/// Obtain another ID from this sequence.
+	pub fn next_id(&mut self) -> SeqID {
+		let id = SeqID(self.next_id);
+		self.next_id += 1;
+
+		id
+	}
+}