ReflectionData.h

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// SPDX-FileCopyrightText: Copyright (c) OpenGeoSys Community (opengeosys.org)
// SPDX-License-Identifier: BSD-3-Clause
 
#pragma once
 
#include <string>
#include <tuple>
 
namespace ProcessLib::Reflection
{
template <typename Class, typename Accessor>
struct ReflectionData
{
    static_assert(std::is_same_v<Accessor, std::remove_cvref_t<Accessor>>);
    static_assert(std::is_invocable_v<Accessor, Class&>);
    static_assert(std::is_invocable_v<Accessor, Class const&>);
    static_assert(
        std::is_lvalue_reference_v<std::invoke_result_t<Accessor, Class&>>);
    static_assert(std::is_lvalue_reference_v<
                  std::invoke_result_t<Accessor, Class const&>>);
 
    ReflectionData(std::string name, Accessor&& accessor)
        : name(std::move(name)), accessor(std::move(accessor))
    {
    }
 
    explicit ReflectionData(Accessor&& accessor) : accessor(std::move(accessor))
    {
    }
 
    std::string name;
    Accessor accessor;
};
 
template <typename Class, typename Accessor>
auto makeReflectionData(Accessor&& accessor)
{
    return ReflectionData<Class, std::remove_cvref_t<Accessor>>{
        std::forward<Accessor>(accessor)};
}
 
template <typename Class, typename Accessor>
auto makeReflectionData(std::string name, Accessor&& accessor)
{
    return ReflectionData<Class, std::remove_cvref_t<Accessor>>{
        std::move(name), std::forward<Accessor>(accessor)};
}
 
template <typename Class, typename Member>
auto makeReflectionData(Member Class::*member)
{
    return makeReflectionData<Class>([member](auto& obj) -> auto&
                                     { return obj.*member; });
}
 
template <typename Class, typename Member>
auto makeReflectionData(std::string name, Member Class::*member)
{
    return makeReflectionData<Class>(
        std::move(name), [member](auto& obj) -> auto& { return obj.*member; });
}
 
template <typename Class, typename Member>
auto reflectWithName(std::string name, Member Class::*member)
{
    return std::tuple{makeReflectionData(std::move(name), member)};
}
 
template <typename Class, typename... Accessors>
auto reflectWithoutName(Accessors&&... accessors)
{
    return std::tuple{
        makeReflectionData<Class>(std::forward<Accessors>(accessors))...};
}
 
template <typename Class, typename... Members>
auto reflectWithoutName(Members Class::*... members)
{
    return std::tuple{makeReflectionData<Class>(members)...};
}
}  // namespace ProcessLib::Reflection