test/std/utilities/memory/unique.ptr/unique.ptr.single/unique.ptr.single.asgn/move_convert02.fail.cpp


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//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <memory>

// unique_ptr

// Test unique_ptr converting move assignment

#include <memory>

#include "test_macros.h"
#include "../../deleter.h"

struct A
{
    A() {}
    virtual ~A() {}
};

struct B : public A
{
};

// Can't assign from lvalue
int main()
{
    std::unique_ptr<B, Deleter<B> > s;
    std::unique_ptr<A, Deleter<A> > s2;
#if TEST_STD_VER >= 11
    s2 = s; // expected-error {{no viable overloaded '='}}
#else
    // NOTE: The move-semantic emulation creates an ambiguous overload set
    // so that assignment from an lvalue does not compile
    s2 = s; // expected-error {{use of overloaded operator '=' is ambiguous}}
#endif
}