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78af2bfb2f
types. It seems some people like to write types that can explicitly convert to anything, but cannot be used to explicitly construct anything. This patch makes tuple tolerate such types, as is required by the standard. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@365074 91177308-0d34-0410-b5e6-96231b3b80d8
122 lines
2.9 KiB
C++
122 lines
2.9 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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> tuple(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 <cassert>
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#include "test_macros.h"
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struct Explicit {
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int value;
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explicit Explicit(int x) : value(x) {}
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};
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struct Implicit {
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int value;
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Implicit(int x) : value(x) {}
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};
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struct B
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{
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int id_;
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explicit B(int i) : 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 BonkersBananas {
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template <class T>
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operator T() &&;
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template <class T, class = void>
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explicit operator T() && = delete;
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};
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void test_bonkers_bananas_conversion() {
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using ReturnType = std::tuple<int, int>;
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static_assert(std::is_convertible<BonkersBananas, ReturnType>(), "");
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static_assert(!std::is_constructible<ReturnType, BonkersBananas>(), "");
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}
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int main(int, char**)
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{
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{
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typedef std::tuple<long> T0;
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typedef std::tuple<long long> T1;
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T0 t0(2);
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T1 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<long, char> T0;
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typedef std::tuple<long long, int> T1;
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T0 t0(2, 'a');
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T1 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<long, char, D> T0;
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typedef std::tuple<long long, int, B> T1;
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T0 t0(2, 'a', D(3));
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T1 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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typedef std::tuple<long, char, D&> T0;
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typedef std::tuple<long long, int, B&> T1;
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T0 t0(2, 'a', d);
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T1 t1 = std::move(t0);
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d.id_ = 2;
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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<long, char, std::unique_ptr<D>> T0;
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typedef std::tuple<long long, int, std::unique_ptr<B>> T1;
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T0 t0(2, 'a', std::unique_ptr<D>(new D(3)));
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T1 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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std::tuple<int> t1(42);
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std::tuple<Explicit> t2(std::move(t1));
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assert(std::get<0>(t2).value == 42);
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}
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{
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std::tuple<int> t1(42);
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std::tuple<Implicit> t2 = std::move(t1);
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assert(std::get<0>(t2).value == 42);
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}
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return 0;
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}
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