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More static asserts and tests on unions (#22)

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Antony Polukhin
2018-05-31 23:26:15 +03:00
parent cb12e9a05d
commit 4a6d8d10c7
7 changed files with 81 additions and 5 deletions
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6
misc/generate_cpp17.py
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@@ -13,7 +13,7 @@ import string
# Skipping some letters that may produce keywords or are hard to read, or shadow template parameters
ascii_letters = string.ascii_letters.replace("o", "").replace("O", "").replace("i", "").replace("I", "").replace("T", "")
PROLOGUE = """// Copyright (c) 2016-2017 Antony Polukhin
PROLOGUE = """// Copyright (c) 2016-2018 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)
@@ -68,6 +68,10 @@ EPILOGUE = """
template <class T>
constexpr auto tie_as_tuple(T& val) noexcept {
static_assert(
!std::is_union<T>::value,
"For safety reasons it is forbidden to reflect unions. It could lead to crashes (for example when attempting to output the union with inactive first `const char*` field)."
);
typedef size_t_<fields_count<T>()> fields_count_tag;
return boost::pfr::detail::tie_as_tuple(val, fields_count_tag{});
}