libcxx/test/libcxx/containers/unord/unord.map/db_swap_1.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
//
//===----------------------------------------------------------------------===//

// <unordered_map>

// template <class Key, class Value, class Hash = hash<Key>, class Pred = equal_to<Key>,
//           class Alloc = allocator<pair<const Key, Value>>>
// class unordered_map

// void swap(unordered_map& x, unordered_map& y);

// UNSUPPORTED: libcxx-no-debug-mode

// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_DEBUG=1

#include <unordered_map>

#include "test_macros.h"
#include "debug_macros.h"

int main(int, char**) {
    typedef std::pair<int, int> P;
    P a1[] = {P(1, 1), P(3, 3), P(7, 7), P(9, 9), P(10, 10)};
    P a2[] = {P(0, 0), P(2, 2), P(4, 4), P(5, 5), P(6, 6), P(8, 8), P(11, 11)};
    std::unordered_map<int, int> c1(a1, a1+sizeof(a1)/sizeof(a1[0]));
    std::unordered_map<int, int> c2(a2, a2+sizeof(a2)/sizeof(a2[0]));
    std::unordered_map<int, int>::iterator i1 = c1.begin();
    std::unordered_map<int, int>::iterator i2 = c2.begin();
    swap(c1, c2);
    c1.erase(i2);
    TEST_LIBCPP_ASSERT_FAILURE(
        c1.erase(i1), "unordered container erase(iterator) called with an iterator not referring to this container");

    return 0;
}