common.h

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/*
 * This file is part of KnowRob, please consult
 * https://github.com/knowrob/knowrob for license details.
 */
 
#ifndef KNOWROB_PARSERS_COMMON_H
#define KNOWROB_PARSERS_COMMON_H
 
#include "memory"
#include <boost/spirit/include/phoenix.hpp>
 
namespace knowrob::parsers {
    // code-snippet found on the web, needed to create smart pointers in parser rules.
    // effectively here `ptr_` is defined and can be used to create std::shared_ptr's
    // in parser rules.
    template<typename T>
    struct make_shared_f {
        template<typename... A>
        struct result {
            typedef std::shared_ptr<T> type;
        };
 
        template<typename... A>
        typename result<A...>::type operator()(A &&... a) const {
            return std::make_shared<T>(std::forward<A>(a)...);
        }
    };
 
    template<typename T> using ptr_ = boost::phoenix::function<make_shared_f<T> >;
}
 
#endif //KNOWROB_PARSERS_COMMON_H