third_party/llvm-project/libcxx/test/std/utilities/tuple/tuple.tuple/PR38601.pass.cpp

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// Regression test for https://llvm.org/PR38601

// UNSUPPORTED: c++03

#include <cassert>
#include <tuple>

using Base = std::tuple<int, int>;

struct Derived : Base {
    template <class ...Ts>
    Derived(int x, Ts... ts): Base(ts...), x_(x) { }
    operator int () const { return x_; }
    int x_;
};

int main(int, char**) {
    Derived d(1, 2, 3);
    Base b = static_cast<Base>(d);
    assert(std::get<0>(b) == 2);
    assert(std::get<1>(b) == 3);
    return 0;
}