//===----------------------------------------------------------------------===//
//
// 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_set>

// template <class Value, class Hash = hash<Value>, class Pred = equal_to<Value>,
//           class Alloc = allocator<Value>>
// class unordered_set

// unordered_set(const unordered_set& u);

#include <unordered_set>
#include <cassert>
#include <cfloat>
#include <cmath>
#include <cstddef>

#include "test_macros.h"
#include "../../../test_compare.h"
#include "../../../test_hash.h"
#include "test_allocator.h"
#include "min_allocator.h"

int main(int, char**) {
  {
    typedef std::unordered_set<int, test_hash<int>, test_equal_to<int>, test_allocator<int> > C;
    typedef int P;
    P a[] = {P(1), P(2), P(3), P(4), P(1), P(2)};
    C c0(a, a + sizeof(a) / sizeof(a[0]), 7, test_hash<int>(8), test_equal_to<int>(9), test_allocator<int>(10));
    C c = c0;
    LIBCPP_ASSERT(c.bucket_count() == 7);
    assert(c.size() == 4);
    assert(c.count(1) == 1);
    assert(c.count(2) == 1);
    assert(c.count(3) == 1);
    assert(c.count(4) == 1);
    assert(c.hash_function() == test_hash<int>(8));
    assert(c.key_eq() == test_equal_to<int>(9));
    assert(c.get_allocator() == test_allocator<int>(10));
    assert(!c.empty());
    assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
    assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
    assert(std::fabs(c.load_factor() - (float)c.size() / c.bucket_count()) < FLT_EPSILON);
    assert(c.max_load_factor() == 1);
  }
#if TEST_STD_VER >= 11
  {
    typedef std::unordered_set<int, test_hash<int>, test_equal_to<int>, other_allocator<int> > C;
    typedef int P;
    P a[] = {P(1), P(2), P(3), P(4), P(1), P(2)};
    C c0(a, a + sizeof(a) / sizeof(a[0]), 7, test_hash<int>(8), test_equal_to<int>(9), other_allocator<int>(10));
    C c = c0;
    LIBCPP_ASSERT(c.bucket_count() == 7);
    assert(c.size() == 4);
    assert(c.count(1) == 1);
    assert(c.count(2) == 1);
    assert(c.count(3) == 1);
    assert(c.count(4) == 1);
    assert(c.hash_function() == test_hash<int>(8));
    assert(c.key_eq() == test_equal_to<int>(9));
    assert(c.get_allocator() == other_allocator<int>(-2));
    assert(!c.empty());
    assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
    assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
    assert(std::fabs(c.load_factor() - (float)c.size() / c.bucket_count()) < FLT_EPSILON);
    assert(c.max_load_factor() == 1);
  }
  {
    typedef std::unordered_set<int, test_hash<int>, test_equal_to<int>, min_allocator<int> > C;
    typedef int P;
    P a[] = {P(1), P(2), P(3), P(4), P(1), P(2)};
    C c0(a, a + sizeof(a) / sizeof(a[0]), 7, test_hash<int>(8), test_equal_to<int>(9), min_allocator<int>());
    C c = c0;
    LIBCPP_ASSERT(c.bucket_count() == 7);
    assert(c.size() == 4);
    assert(c.count(1) == 1);
    assert(c.count(2) == 1);
    assert(c.count(3) == 1);
    assert(c.count(4) == 1);
    assert(c.hash_function() == test_hash<int>(8));
    assert(c.key_eq() == test_equal_to<int>(9));
    assert(c.get_allocator() == min_allocator<int>());
    assert(!c.empty());
    assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
    assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
    assert(std::fabs(c.load_factor() - (float)c.size() / c.bucket_count()) < FLT_EPSILON);
    assert(c.max_load_factor() == 1);
  }
#endif

  return 0;
}