test/std/utilities/any/any.class/any.assign/move.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
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11, c++14

// Throwing bad_any_cast is supported starting in macosx10.13
// XFAIL: use_system_cxx_lib && x86_64-apple-macosx10.12 && !no-exceptions
// XFAIL: use_system_cxx_lib && x86_64-apple-macosx10.11 && !no-exceptions
// XFAIL: use_system_cxx_lib && x86_64-apple-macosx10.10 && !no-exceptions
// XFAIL: use_system_cxx_lib && x86_64-apple-macosx10.9 && !no-exceptions

// <any>

// any& operator=(any &&);

// Test move assignment.

#include <any>
#include <cassert>

#include "any_helpers.h"
#include "test_macros.h"

using std::any;
using std::any_cast;

template <class LHS, class RHS>
void test_move_assign() {
    assert(LHS::count == 0);
    assert(RHS::count == 0);
    {
        LHS const s1(1);
        any a(s1);
        RHS const s2(2);
        any a2(s2);

        assert(LHS::count == 2);
        assert(RHS::count == 2);

        a = std::move(a2);

        assert(LHS::count == 1);
        assert(RHS::count == 2 + a2.has_value());
        LIBCPP_ASSERT(RHS::count == 2); // libc++ leaves the object empty

        assertContains<RHS>(a, 2);
        if (a2.has_value())
            assertContains<RHS>(a2, 0);
        LIBCPP_ASSERT(!a2.has_value());
    }
    assert(LHS::count == 0);
    assert(RHS::count == 0);
}

template <class LHS>
void test_move_assign_empty() {
    assert(LHS::count == 0);
    {
        any a;
        any a2((LHS(1)));

        assert(LHS::count == 1);

        a = std::move(a2);

        assert(LHS::count == 1 + a2.has_value());
        LIBCPP_ASSERT(LHS::count == 1);

        assertContains<LHS>(a, 1);
        if (a2.has_value())
            assertContains<LHS>(a2, 0);
        LIBCPP_ASSERT(!a2.has_value());
    }
    assert(LHS::count == 0);
    {
        any a((LHS(1)));
        any a2;

        assert(LHS::count == 1);

        a = std::move(a2);

        assert(LHS::count == 0);

        assertEmpty<LHS>(a);
        assertEmpty(a2);
    }
    assert(LHS::count == 0);
}

void test_move_assign_noexcept() {
    any a1;
    any a2;
    static_assert(
        noexcept(a1 = std::move(a2))
      , "any & operator=(any &&) must be noexcept"
      );
}

int main(int, char**) {
    test_move_assign_noexcept();
    test_move_assign<small1, small2>();
    test_move_assign<large1, large2>();
    test_move_assign<small, large>();
    test_move_assign<large, small>();
    test_move_assign_empty<small>();
    test_move_assign_empty<large>();

  return 0;
}