c52f43e72d
git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@111767 91177308-0d34-0410-b5e6-96231b3b80d8
72 lines
1.7 KiB
C++
72 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <tuple>
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// template<class... Types>
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// tuple<Types&&...> forward_as_tuple(Types&&... t);
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#include <tuple>
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#include <cassert>
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template <class Tuple>
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void
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test0(const Tuple& t)
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{
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static_assert(std::tuple_size<Tuple>::value == 0, "");
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}
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template <class Tuple>
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void
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test1a(const Tuple& t)
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{
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static_assert(std::tuple_size<Tuple>::value == 1, "");
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static_assert(std::is_same<typename std::tuple_element<0, Tuple>::type, int&&>::value, "");
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assert(std::get<0>(t) == 1);
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}
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template <class Tuple>
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void
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test1b(const Tuple& t)
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{
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static_assert(std::tuple_size<Tuple>::value == 1, "");
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static_assert(std::is_same<typename std::tuple_element<0, Tuple>::type, int&>::value, "");
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assert(std::get<0>(t) == 2);
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}
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template <class Tuple>
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void
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test2a(const Tuple& t)
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{
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static_assert(std::tuple_size<Tuple>::value == 2, "");
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static_assert(std::is_same<typename std::tuple_element<0, Tuple>::type, double&>::value, "");
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static_assert(std::is_same<typename std::tuple_element<1, Tuple>::type, char&>::value, "");
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assert(std::get<0>(t) == 2.5);
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assert(std::get<1>(t) == 'a');
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}
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int main()
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{
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{
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test0(std::forward_as_tuple());
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}
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{
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test1a(std::forward_as_tuple(1));
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}
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{
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int i = 2;
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test1b(std::forward_as_tuple(i));
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}
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{
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double i = 2.5;
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char c = 'a';
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test2a(std::forward_as_tuple(i, c));
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}
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}
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