Working proof of concept

src/parser.hpp

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+#pragma once
+
+#include <string_view>
+#include <boost/spirit/home/x3/support/ast/variant.hpp>
+#include <map>
+#include <vector>
+
+namespace duck {
+typedef std::string_view TorrentStringType;
+
+struct TorrentValue : public boost::spirit::x3::variant<
+	long long,
+	TorrentStringType,
+	boost::spirit::x3::forward_ast< std::vector<TorrentValue> >,
+	boost::spirit::x3::forward_ast< std::map<TorrentStringType, TorrentValue> >
+> {
+	using base_type::base_type;
+	using base_type::operator=;
+};
+
+std::vector<TorrentValue> parse_torrent (std::string_view binary_data);
+
+} //namespace duck