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authorAndré Nusser <andre.nusser@googlemail.com>2020-01-12 15:41:39 +0100
committerAndré Nusser <andre.nusser@googlemail.com>2020-02-16 19:57:13 +0100
commitfb992677cf62b6aa982476538faae43e5bbbd87f (patch)
tree8973b63653e2acbecb2b273444b4dc67dc623fd8 /src/id.h
parent8070e5578aa9d185f07534778dc0ebf596fece13 (diff)
Introduce EventsDS to handle all the events and enable new features.
Also: * Added an id.h class to make IDs with type * Added a range class to easily use range based for loops
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * id.h
+ *
+ * Sun 16 Feb 2020 04:17:19 PM CET
+ * Copyright 2020 André Nusser
+ * andre.nusser@googlemail.com
+ ****************************************************************************/
+
+/*
+ * This file is part of DrumGizmo.
+ *
+ * DrumGizmo is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * DrumGizmo 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with DrumGizmo; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+#pragma once
+
+#include <cstdint>
+#include <functional>
+#include <limits>
+
+// Typesafe ID class such that there are compiler errors if different IDs are
+// mixed. The template parameter T is just there to assure this behavior.
+// Additionally, we have a member function which can check for validity.
+template <typename T>
+struct ID
+{
+public:
+ using IDType = uint32_t;
+ static constexpr IDType invalid_value = std::numeric_limits<IDType>::max();
+
+ ID(IDType id = invalid_value) : id(id) {}
+
+ operator IDType() const { return id; }
+ IDType operator+(ID<T> other) const { return id + other.id; }
+ IDType operator+(int offset) const { return id + offset; }
+ IDType operator+(size_t offset) const { return id + offset; }
+ IDType operator-(ID<T> other) const { return id - other.id; }
+ IDType operator-(int offset) const { return id - offset; }
+ IDType operator/(int div) const { return id/div; }
+ IDType operator+=(ID<T> other) { return id += other.id; }
+ IDType operator-=(ID<T> other) { return id -= other.id; }
+ IDType operator=(ID<T> other) { return id = other.id; }
+ IDType operator++() { return ++id; }
+ IDType operator--() { return --id; }
+ bool operator!=(ID<T> other) const { return id != other.id; }
+
+ bool valid() const { return id != invalid_value; }
+ void invalidate() { id = invalid_value; }
+
+private:
+ IDType id;
+};
+
+// define custom hash function to be able to use IDs with maps/sets
+namespace std
+{
+
+template <typename T>
+struct hash<ID<T>>
+{
+ using IDType = typename ID<T>::IDType;
+ std::size_t operator()(ID<T> const& id) const noexcept
+ {
+ return std::hash<IDType>()(id);
+ }
+};
+
+} // std