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// Copyright (c) 2016-2024 Antony Polukhin
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PFR_DETAIL_CORE17_HPP
#define BOOST_PFR_DETAIL_CORE17_HPP
#pragma once
#include <boost/pfr/detail/core17_generated.hpp>
#include <boost/pfr/detail/fields_count.hpp>
#include <boost/pfr/detail/for_each_field_impl.hpp>
#include <boost/pfr/detail/rvalue_t.hpp>
namespace boost { namespace pfr { namespace detail {
#ifndef _MSC_VER // MSVC fails to compile the following code, but compiles the structured bindings in core17_generated.hpp
struct do_not_define_std_tuple_size_for_me {
bool test1 = true;
};
template <class T>
constexpr bool do_structured_bindings_work() noexcept { // ******************************************* IN CASE OF ERROR READ THE FOLLOWING LINES IN boost/pfr/detail/core17.hpp FILE:
T val{};
auto& [a] = val; // ******************************************* IN CASE OF ERROR READ THE FOLLOWING LINES IN boost/pfr/detail/core17.hpp FILE:
/****************************************************************************
*
* It looks like your compiler or Standard Library can not handle C++17
* structured bindings.
*
* Workaround: Define BOOST_PFR_USE_CPP17 to 0
* It will disable the C++17 features for Boost.PFR library.
*
* Sorry for the inconvenience caused.
*
****************************************************************************/
return a;
}
static_assert(
do_structured_bindings_work<do_not_define_std_tuple_size_for_me>(),
"====================> Boost.PFR: Your compiler can not handle C++17 structured bindings. Read the above comments for workarounds."
);
#endif // #ifndef _MSC_VER
template <class T>
constexpr auto tie_as_tuple(T& val) noexcept {
static_assert(
!std::is_union<T>::value,
"====================> Boost.PFR: For safety reasons it is forbidden to reflect unions. See `Reflection of unions` section in the docs for more info."
);
typedef size_t_<boost::pfr::detail::fields_count<T>()> fields_count_tag;
return boost::pfr::detail::tie_as_tuple(val, fields_count_tag{});
}
template <class T, class F, std::size_t... I>
constexpr void for_each_field_dispatcher(T& t, F&& f, std::index_sequence<I...>) {
static_assert(
!std::is_union<T>::value,
"====================> Boost.PFR: For safety reasons it is forbidden to reflect unions. See `Reflection of unions` section in the docs for more info."
);
std::forward<F>(f)(
detail::tie_as_tuple(t)
);
}
}}} // namespace boost::pfr::detail
#endif // BOOST_PFR_DETAIL_CORE17_HPP
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