55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
// Copyright Louis Dionne 2013-2022
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
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#include <boost/hana/detail/decay.hpp>
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#include <type_traits>
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namespace hana = boost::hana;
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template <typename T, typename Decayed>
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void check() {
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static_assert(std::is_same<
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typename hana::detail::decay<T>::type,
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Decayed
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>::value, "");
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}
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int main() {
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// void is untouched
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check<void, void>();
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// normal types lose cv-qualifiers
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check<int, int>();
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check<int const, int>();
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check<int const volatile, int>();
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// [cv-qualified] references are stripped
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check<int&, int>();
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check<int const&, int>();
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check<int&&, int>();
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check<int const&&, int>();
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// pointers are untouched
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check<int*, int*>();
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check<int const*, int const*>();
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check<int volatile*, int volatile*>();
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check<int const volatile*, int const volatile*>();
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// arrays decay to pointers
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check<int[], int*>();
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check<int[10], int*>();
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check<int const[10], int const*>();
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check<int volatile[10], int volatile*>();
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check<int const volatile[10], int const volatile*>();
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// functions decay to function pointers
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check<void(), void(*)()>();
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check<void(...), void (*)(...)>();
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check<void(int), void(*)(int)>();
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check<void(int, ...), void(*)(int, ...)>();
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check<void(int, float), void(*)(int, float)>();
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check<void(int, float, ...), void(*)(int, float, ...)>();
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}
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