Added simple wrapper for std::from_chars

src/utils/from_chars.hpp

@@ -0,0 +1,33 @@
+/*
+	Copyright (C) 2024
+	Part of the Battle for Wesnoth Project https://www.wesnoth.org/
+
+	This program 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 2 of the License, or
+	(at your option) any later version.
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY.
+
+	See the COPYING file for more details.
+*/
+
+#include <charconv>
+#include <optional>
+#include <string_view>
+
+namespace utils
+{
+template<typename T>
+std::optional<T> from_chars(std::string_view str)
+{
+	T result {};
+	const auto [_, ec] = std::from_chars(str.data(), str.data() + str.size(), result);
+
+	if(ec == std::errc{}) {
+		return result;
+	} else {
+		return std::nullopt;
+	}
+}
+} // namespace utils