111 lines
2.7 KiB
C++
111 lines
2.7 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 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 <class... UTypes>
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// tuple& operator=(tuple<UTypes...>&& u);
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// UNSUPPORTED: c++98, c++03
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#include <tuple>
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#include <string>
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#include <memory>
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#include <utility>
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#include <cassert>
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struct B
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{
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int id_;
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explicit B(int i= 0) : id_(i) {}
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virtual ~B() {}
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};
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struct D
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: B
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{
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explicit D(int i) : B(i) {}
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};
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struct E {
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E() = default;
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E& operator=(int) {
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return *this;
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}
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};
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int main()
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{
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{
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typedef std::tuple<double> T0;
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typedef std::tuple<int> T1;
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T0 t0(2.5);
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T1 t1;
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t1 = std::move(t0);
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assert(std::get<0>(t1) == 2);
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}
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{
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typedef std::tuple<double, char> T0;
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typedef std::tuple<int, int> T1;
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T0 t0(2.5, 'a');
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T1 t1;
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t1 = std::move(t0);
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assert(std::get<0>(t1) == 2);
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assert(std::get<1>(t1) == int('a'));
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}
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{
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typedef std::tuple<double, char, D> T0;
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typedef std::tuple<int, int, B> T1;
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T0 t0(2.5, 'a', D(3));
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T1 t1;
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t1 = std::move(t0);
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assert(std::get<0>(t1) == 2);
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assert(std::get<1>(t1) == int('a'));
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assert(std::get<2>(t1).id_ == 3);
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}
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{
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D d(3);
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D d2(2);
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typedef std::tuple<double, char, D&> T0;
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typedef std::tuple<int, int, B&> T1;
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T0 t0(2.5, 'a', d2);
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T1 t1(1.5, 'b', d);
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t1 = std::move(t0);
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assert(std::get<0>(t1) == 2);
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assert(std::get<1>(t1) == int('a'));
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assert(std::get<2>(t1).id_ == 2);
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}
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{
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typedef std::tuple<double, char, std::unique_ptr<D>> T0;
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typedef std::tuple<int, int, std::unique_ptr<B>> T1;
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T0 t0(2.5, 'a', std::unique_ptr<D>(new D(3)));
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T1 t1;
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t1 = std::move(t0);
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assert(std::get<0>(t1) == 2);
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assert(std::get<1>(t1) == int('a'));
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assert(std::get<2>(t1)->id_ == 3);
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}
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{
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// Test that tuple evaluates correctly applies an lvalue reference
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// before evaluating is_assignable (ie 'is_assignable<int&, int&&>')
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// instead of evaluating 'is_assignable<int&&, int&&>' which is false.
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int x = 42;
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int y = 43;
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std::tuple<int&&, E> t(std::move(x), E{});
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std::tuple<int&&, int> t2(std::move(y), 44);
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t = std::move(t2);
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assert(std::get<0>(t) == 43);
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assert(&std::get<0>(t) == &x);
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}
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}
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