70 lines
1.9 KiB
C++
70 lines
1.9 KiB
C++
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//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// type_traits
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// void_t
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#include <type_traits>
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#if _LIBCPP_STD_VER <= 14
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int main () {}
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#else
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template <class T>
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void test1()
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{
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static_assert( std::is_same<void, std::void_t<T>>::value, "");
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static_assert( std::is_same<void, std::void_t<const T>>::value, "");
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static_assert( std::is_same<void, std::void_t<volatile T>>::value, "");
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static_assert( std::is_same<void, std::void_t<const volatile T>>::value, "");
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}
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template <class T, class U>
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void test2()
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{
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static_assert( std::is_same<void, std::void_t<T, U>>::value, "");
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static_assert( std::is_same<void, std::void_t<const T, U>>::value, "");
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static_assert( std::is_same<void, std::void_t<volatile T, U>>::value, "");
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static_assert( std::is_same<void, std::void_t<const volatile T, U>>::value, "");
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static_assert( std::is_same<void, std::void_t<T, const U>>::value, "");
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static_assert( std::is_same<void, std::void_t<const T, const U>>::value, "");
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static_assert( std::is_same<void, std::void_t<volatile T, const U>>::value, "");
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static_assert( std::is_same<void, std::void_t<const volatile T, const U>>::value, "");
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}
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class Class
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{
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public:
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~Class();
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};
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int main()
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{
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static_assert( std::is_same<void, std::void_t<>>::value, "");
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test1<void>();
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test1<int>();
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test1<double>();
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test1<int&>();
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test1<Class>();
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test1<Class[]>();
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test1<Class[5]>();
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test2<void, int>();
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test2<double, int>();
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test2<int&, int>();
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test2<Class&, bool>();
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test2<void *, int&>();
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static_assert( std::is_same<void, std::void_t<int, double const &, Class, volatile int[], void>>::value, "");
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}
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#endif
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