82 lines
2.3 KiB
C++
82 lines
2.3 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 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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// <tuple>
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// template <class... Types> class tuple;
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// template <size_t I, class... Types>
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// typename tuple_element<I, tuple<Types...> >::type&
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// get(tuple<Types...>& t);
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#include <tuple>
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#include <string>
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#include <cassert>
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#if __cplusplus > 201103L
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struct Empty {};
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struct S {
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std::tuple<int, Empty> a;
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int k;
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Empty e;
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constexpr S() : a{1,Empty{}}, k(std::get<0>(a)), e(std::get<1>(a)) {}
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};
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constexpr std::tuple<int, int> getP () { return { 3, 4 }; }
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#endif
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int main()
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{
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{
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typedef std::tuple<int> T;
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T t(3);
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assert(std::get<0>(t) == 3);
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std::get<0>(t) = 2;
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assert(std::get<0>(t) == 2);
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}
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{
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typedef std::tuple<std::string, int> T;
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T t("high", 5);
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assert(std::get<0>(t) == "high");
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assert(std::get<1>(t) == 5);
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std::get<0>(t) = "four";
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std::get<1>(t) = 4;
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assert(std::get<0>(t) == "four");
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assert(std::get<1>(t) == 4);
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}
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{
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typedef std::tuple<double&, std::string, int> T;
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double d = 1.5;
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T t(d, "high", 5);
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assert(std::get<0>(t) == 1.5);
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assert(std::get<1>(t) == "high");
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assert(std::get<2>(t) == 5);
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std::get<0>(t) = 2.5;
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std::get<1>(t) = "four";
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std::get<2>(t) = 4;
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assert(std::get<0>(t) == 2.5);
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assert(std::get<1>(t) == "four");
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assert(std::get<2>(t) == 4);
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assert(d == 2.5);
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}
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#if _LIBCPP_STD_VER > 11
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{ // get on an rvalue tuple
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static_assert ( std::get<0> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 0, "" );
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static_assert ( std::get<1> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 1, "" );
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static_assert ( std::get<2> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 2, "" );
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static_assert ( std::get<3> ( std::make_tuple ( 0.0f, 1, 2.0, 3L )) == 3, "" );
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static_assert(S().k == 1, "");
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static_assert(std::get<1>(getP()) == 4, "");
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}
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#endif
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}
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