Implement Version class

include/duckhandy/version_bt.hpp

@@ -0,0 +1,101 @@
+/* Copyright 2016-2021 Michele Santullo
+ * This file is part of "duckhandy".
+ *
+ * "duckhandy" 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.
+ *
+ * "duckhandy" 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 "duckhandy".  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef id5594416333AA4792BFEC94E863E03B08
+#define id5594416333AA4792BFEC94E863E03B08
+
+#include "int_conv.hpp"
+#include <cstddef>
+#include <stdexcept>
+
+namespace dhandy {
+
+template <std::size_t N>
+class Version {
+public:
+	constexpr static std::size_t Count = N;
+
+	constexpr Version (const char* const ver, bool accept_less=false);
+
+	constexpr unsigned int operator[] (std::size_t idx) const;
+	constexpr unsigned int major() const;
+	constexpr unsigned int minor() const;
+	constexpr unsigned int revision() const;
+
+private:
+	unsigned int m_versions[N];
+};
+
+template <std::size_t N>
+inline constexpr Version<N>::Version (const char* const ver, bool accept_less) :
+	m_versions{0}
+{
+	std::size_t z = 0;
+	std::size_t s = 0;
+	std::size_t idx = 0;
+	bool commit = false;
+
+	do {
+		if (ver[z] >= '0' and ver[z] <= '9') {
+			commit = true;
+		}
+		else if (commit) {
+			commit = false;
+			m_versions[idx++] = dhandy::ary_to_int<unsigned int>(ver + s, ver + z);
+			s = z + 1;
+		}
+		else {
+			s = z + 1;
+		}
+	} while(ver[z++] and idx < N);
+
+	if (not accept_less and idx < N)
+		throw std::invalid_argument("Input version doesn't contain enough version numbers");
+}
+
+template <std::size_t N>
+inline constexpr unsigned int Version<N>::operator[] (std::size_t idx) const {
+	if (idx < N)
+		return m_versions[idx];
+	else
+		throw std::out_of_range("Index is out of range");
+}
+
+template <std::size_t N>
+inline constexpr unsigned int Version<N>::major() const {
+	return m_versions[0];
+}
+
+template <std::size_t N>
+inline constexpr unsigned int Version<N>::minor() const {
+	if constexpr (N > 1)
+		return m_versions[1];
+	else
+		throw std::out_of_range("Not enough version entries, there is no minor number");
+}
+
+template <std::size_t N>
+inline constexpr unsigned int Version<N>::revision() const {
+	if constexpr (N > 2)
+		return m_versions[2];
+	else
+		throw std::out_of_range("Not enough version entries, there is no revision number");
+}
+
+} //namespace dhandy
+
+#endif