Variant_internal.hpp

/* Copyright 2025 Franz Poeschel
 *
 * This file is part of openPMD-api.
 *
 * openPMD-api is free software: you can redistribute it and/or modify
 * it under the terms of of either the GNU General Public License or
 * the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * openPMD-api is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License and the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * and the GNU Lesser General Public License along with openPMD-api.
 * If not, see <http://www.gnu.org/licenses/>.
 */
#pragma once
 
#define OPENPMD_GUARD_HEADER_AGAINST_PUBLIC_INCLUSION
 
#include "openPMD/DatatypeMacros.hpp"
#include "openPMD/auxiliary/TypeTraits.hpp"
 
#include <variant>
 
namespace openPMD
{
namespace detail
{
    struct to_vector_type
    {
        template <typename T>
        using type = std::vector<T>;
    };
} // namespace detail
 
#define OPENPMD_ENUMERATE_TYPES(type) , type
 
using dataset_types = auxiliary::detail::variant_tail_t<
    auxiliary::detail::bottom OPENPMD_FOREACH_DATASET_DATATYPE(
        OPENPMD_ENUMERATE_TYPES)>;
 
using non_vector_types = auxiliary::detail::variant_tail_t<
    auxiliary::detail::bottom OPENPMD_FOREACH_NONVECTOR_DATATYPE(
        OPENPMD_ENUMERATE_TYPES)>;
 
using attribute_types = auxiliary::detail::variant_tail_t<
    auxiliary::detail::bottom OPENPMD_FOREACH_DATATYPE(
        OPENPMD_ENUMERATE_TYPES)>;
 
// std::variant<std::vector<T_1>, std::vector<T_2>, ...>
// for all T_i in openPMD::Datatype.
using vector_of_attributes_type = typename auxiliary::detail::
    map_variant<detail::to_vector_type, attribute_types>::type;
 
#undef OPENPMD_ENUMERATE_TYPES
} // namespace openPMD