system_message.hpp

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//=======================================================================
// Copyright (c) 2015
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//=======================================================================
#ifndef PAAL_SYSTEM_MESSAGE_HPP
#define PAAL_SYSTEM_MESSAGE_HPP

#include <string>
#include <cstdlib>
#include <iostream>

namespace paal {

namespace utils {

inline auto print_message(std::ostream &output_stream) {
    output_stream << std::endl;
}

template <typename Arg, typename ...Args>
auto print_message(std::ostream &output_stream, Arg &&arg, Args... args) {
    output_stream << arg;
    print_message(output_stream, std::forward<Args>(args)...);
}

template <typename Arg, typename ...Args>
auto info(Arg &&arg, Args... args) {
    print_message(std::cout, std::forward<Arg>(arg), std::forward<Args>(args)...);
}

template <typename Arg, typename ...Args>
auto warning(Arg &&arg, Args... args) {
    static const std::string message_prefix = "Warning: ";
    print_message(std::cerr, message_prefix, std::forward<Arg>(arg), std::forward<Args>(args)...);
}

template <typename Arg, typename ...Args>
auto failure(Arg &&arg, Args... args) {
    static const std::string message_prefix = "Failure: ";
    print_message(std::cerr, message_prefix, std::forward<Arg>(arg), std::forward<Args>(args)...);
    std::exit(EXIT_FAILURE);
}

struct failure_message {
    template <typename Arg, typename ...Args>
    void operator()(Arg &&arg, Args... args) {
        failure(std::forward<Arg>(arg), std::forward<Args>(args)...);
    }
};

} // utils

} // paal

#endif // PAAL_SYSTEM_MESSAGE_HPP