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123 lines
4.2 KiB
Python
123 lines
4.2 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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#include <boost/pfr/detail/fields_count.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;
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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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}}} // 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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generate_sfinae_attempts = False
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if generate_sfinae_attempts:
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print """
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template <class T, std::size_t I>
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constexpr auto tie_as_tuple(T& val, size_t_<I>) noexcept {
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return tie_as_tuple(val, size_t_<I - 1>{});
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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 xrange(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;"
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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;"
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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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if generate_sfinae_attempts:
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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) + "> v) noexcept"
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print " ->decltype( ::boost::pfr::detail::tie_as_tuple0(std::forward<T>(val), v) )"
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print "{ return ::boost::pfr::detail::tie_as_tuple0(std::forward<T>(val), v); }\n"
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print EPILOGUE
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