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https://github.com/boostorg/pfr.git
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112 lines
4.3 KiB
Python
112 lines
4.3 KiB
Python
#!/usr/bin/python
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# Copyright (c) 2016-2020 Antony Polukhin
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#
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# Distributed under the Boost Software License, Version 1.0. (See accompanying
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# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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############################################################################################################################
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import sys
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import string
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# Skipping some letters that may produce keywords or are hard to read, or shadow template parameters
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ascii_letters = string.ascii_letters.replace("o", "").replace("O", "").replace("i", "").replace("I", "").replace("T", "")
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PROLOGUE = """// Copyright (c) 2016-2020 Antony Polukhin
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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//////////////// THIS HEADER IS AUTO GENERATED BY misc/generate_cpp17.py ////////////////
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//////////////// MODIFY AND RUN THE misc/generate_cpp17.py INSTEAD OF DIRECTLY MODIFYING THE GENERATED FILE ////////////////
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
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#ifndef BOOST_PFR_DETAIL_CORE17_GENERATED_HPP
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#define BOOST_PFR_DETAIL_CORE17_GENERATED_HPP
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#pragma once
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#include <boost/pfr/detail/config.hpp>
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#if !BOOST_PFR_USE_CPP17
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# error C++17 is required for this header.
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#endif
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#include <boost/pfr/detail/sequence_tuple.hpp>
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#include <boost/pfr/detail/size_t_.hpp>
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namespace boost { namespace pfr { namespace detail {
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template <class... Args>
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constexpr auto make_tuple_of_references(Args&&... args) noexcept {
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return sequence_tuple::tuple<Args&...>{ args... };
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}
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template <class T>
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constexpr auto tie_as_tuple(T& /*val*/, size_t_<0>) noexcept {
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return sequence_tuple::tuple<>{};
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}
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template <class T>
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constexpr auto tie_as_tuple(T& val, size_t_<1>, std::enable_if_t<std::is_class< std::remove_cv_t<T> >::value>* = 0) noexcept {
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auto& [a] = val; // ====================> Boost.PFR: User-provided type is not a SimpleAggregate.
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return ::boost::pfr::detail::make_tuple_of_references(a);
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}
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template <class T>
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constexpr auto tie_as_tuple(T& val, size_t_<1>, std::enable_if_t<!std::is_class< std::remove_cv_t<T> >::value>* = 0) noexcept {
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return ::boost::pfr::detail::make_tuple_of_references( val );
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}
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"""
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############################################################################################################################
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EPILOGUE = """
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template <class T, std::size_t I>
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constexpr void tie_as_tuple(T& /*val*/, size_t_<I>) noexcept {
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static_assert(sizeof(T) && false,
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"====================> Boost.PFR: Too many fields in a structure T. Regenerate include/boost/pfr/detail/core17_generated.hpp file for appropriate count of fields. For example: `python ./misc/generate_cpp17.py 300 > include/boost/pfr/detail/core17_generated.hpp`");
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}
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}}} // namespace boost::pfr::detail
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#endif // BOOST_PFR_DETAIL_CORE17_GENERATED_HPP
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"""
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############################################################################################################################
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indexes = " a"
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print(PROLOGUE)
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funcs_count = 100 if len(sys.argv) == 1 else int(sys.argv[1])
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max_args_on_a_line = len(ascii_letters)
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for i in range(1, funcs_count):
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if i % max_args_on_a_line == 0:
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indexes += ",\n "
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else:
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indexes += ","
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if i >= max_args_on_a_line:
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indexes += ascii_letters[i // max_args_on_a_line - 1]
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indexes += ascii_letters[i % max_args_on_a_line]
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print("template <class T>")
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print("constexpr auto tie_as_tuple(T& val, size_t_<" + str(i + 1) + ">) noexcept {")
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if i < max_args_on_a_line:
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print(" auto& [" + indexes.strip() + "] = val; // ====================> Boost.PFR: User-provided type is not a SimpleAggregate.")
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print(" return ::boost::pfr::detail::make_tuple_of_references(" + indexes.strip() + ");")
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else:
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print(" auto& [")
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print(indexes)
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print(" ] = val; // ====================> Boost.PFR: User-provided type is not a SimpleAggregate.")
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print("")
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print(" return ::boost::pfr::detail::make_tuple_of_references(")
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print(indexes)
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print(" );")
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print("}\n")
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print(EPILOGUE)
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