error.h

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// Copyright (c) 2014-2018, The Monero Project
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this list of
//    conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
//    of conditions and the following disclaimer in the documentation and/or other
//    materials provided with the distribution.
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//    used to endorse or promote products derived from this software without specific
//    prior written permission.
//
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#pragma once

#include <system_error>
#include <type_traits>

#define ELECTRONEUM_LMDB_CHECK(...)         \
    do                                 \
    {                                  \
        const int err = __VA_ARGS__ ;  \
        if (err)                       \
            return {lmdb::error(err)}; \
    } while (0)

namespace lmdb
{
    enum class error : int
    {
        // 0 is reserved for no error, as per expect<T>
        // All other errors are the values reported by LMDB
    };

    std::error_category const& error_category() noexcept;

    inline std::error_code make_error_code(error value) noexcept
    {
        return std::error_code{int(value), error_category()};
    }
}

namespace std
{
    template<>
    struct is_error_code_enum<::lmdb::error>
      : true_type
    {};
}