Program Listing for File status.hpp

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/*************************************************************************
 * Copyright (C) 2019 Blue Brain Project
 *
 * This file is part of Basalt distributed under the terms of the GNU
 * Lesser General Public License. See top-level LICENSE file for details.
 *************************************************************************/
#pragma once

#include <iosfwd>
#include <string>

#include <basalt/fwd.hpp>

namespace basalt {

struct Status {
    enum Code {
        ok_code = 0,
        not_implemented_code = -1,
        missing_vertex_code = -2,
        invalid_edge_code = -3,
        missing_edge_code = -4,
    };


    Status(Code code, std::string message);
    Status() = delete;
    inline bool operator!() const noexcept {
        return code != 0;
    }
    inline explicit operator bool() const noexcept {
        return code == 0;
    }

    const Status& raise_on_error() const;

    static const Status& error_not_implemented();

    static Status error_missing_vertex(const vertex_uid_t& vertex);

    static Status error_missing_edge(const edge_uid_t& edge);

    static Status error_invalid_edge(const vertex_uid_t& vertex1, const vertex_uid_t& vertex2);

    static const Status& ok();

    const Code code;
    const std::string message;
};

}  // namespace basalt

std::ostream& operator<<(std::ostream& ostr, const basalt::Status& status);