Datatype_internal.hpp

/* Copyright 2022 Franz Poeschel, Axel Huebl
 *
 * 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
 
#include "openPMD/auxiliary/TypeTraits.hpp"
 
#include <array>
#include <cstddef>
#include <vector>
 
namespace openPMD
{
namespace detail
{
    template <typename DoDetermineDatatype>
    struct BasicDatatype
    {
        using DT = typename DoDetermineDatatype::DT_enum;
 
        template <typename T>
        constexpr static DT call()
        {
            if constexpr (auxiliary::IsVector_v<T>)
            {
                return DoDetermineDatatype::template call<
                    typename T::value_type>();
            }
            else if constexpr (auxiliary::IsArray_v<T>)
            {
                return DoDetermineDatatype::template call<
                    typename T::value_type>();
            }
            else
            {
                return DoDetermineDatatype::template call<T>();
            }
#if defined(__INTEL_COMPILER)
/*
 * ICPC has trouble with if constexpr, thinking that return statements are
 * missing afterwards. Deactivate the warning.
 * Note that putting a statement here will not help to fix this since it will
 * then complain about unreachable code.
 * https://community.intel.com/t5/Intel-C-Compiler/quot-if-constexpr-quot-and-quot-missing-return-statement-quot-in/td-p/1154551
 */
#pragma warning(disable : 1011)
        }
#pragma warning(default : 1011)
#else
        }
#endif
 
        constexpr static char const *errorMsg =
            "basicDatatype: received unknown datatype.";
    };
 
    template <typename DoDetermineDatatype>
    struct ToVectorType
    {
        using DT = typename DoDetermineDatatype::DT_enum;
 
        template <typename T>
        constexpr static DT call()
        {
            if constexpr (auxiliary::IsVector_v<T>)
            {
                return DoDetermineDatatype::template call<T>();
            }
            else if constexpr (auxiliary::IsArray_v<T>)
            {
                return DoDetermineDatatype::template call<
                    std::vector<typename T::value_type>>();
            }
            else
            {
                return DoDetermineDatatype::template call<std::vector<T>>();
            }
#if defined(__INTEL_COMPILER)
/*
 * ICPC has trouble with if constexpr, thinking that return statements are
 * missing afterwards. Deactivate the warning.
 * Note that putting a statement here will not help to fix this since it will
 * then complain about unreachable code.
 * https://community.intel.com/t5/Intel-C-Compiler/quot-if-constexpr-quot-and-quot-missing-return-statement-quot-in/td-p/1154551
 */
#pragma warning(disable : 1011)
        }
#pragma warning(default : 1011)
#else
        }
#endif
 
        constexpr static char const *errorMsg =
            "toVectorType: received unknown datatype.";
    };
} // namespace detail
} // namespace openPMD