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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.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// <unordered_set>
// class unordered_set
// template <class H2, class P2>
// void merge(unordered_set<key_type, H2, P2, allocator_type>& source);
// template <class H2, class P2>
// void merge(unordered_set<key_type, H2, P2, allocator_type>&& source);
// template <class H2, class P2>
// void merge(unordered_multiset<key_type, H2, P2, allocator_type>& source);
// template <class H2, class P2>
// void merge(unordered_multiset<key_type, H2, P2, allocator_type>&& source);
#include <unordered_set>
#include "test_macros.h"
#include "Counter.h"
template <class Set>
bool set_equal(const Set& set, Set other)
{
return set == other;
}
#ifndef TEST_HAS_NO_EXCEPTIONS
template <class T>
struct throw_hasher
{
bool& should_throw_;
throw_hasher(bool& should_throw) : should_throw_(should_throw) {}
typedef size_t result_type;
typedef T argument_type;
size_t operator()(const T& p) const
{
if (should_throw_)
throw 0;
return std::hash<T>()(p);
}
};
#endif
int main()
{
{
std::unordered_set<int> src{1, 3, 5};
std::unordered_set<int> dst{2, 4, 5};
dst.merge(src);
assert(set_equal(src, {5}));
assert(set_equal(dst, {1, 2, 3, 4, 5}));
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
bool do_throw = false;
typedef std::unordered_set<Counter<int>, throw_hasher<Counter<int>>> set_type;
set_type src({1, 3, 5}, 0, throw_hasher<Counter<int>>(do_throw));
set_type dst({2, 4, 5}, 0, throw_hasher<Counter<int>>(do_throw));
assert(Counter_base::gConstructed == 6);
do_throw = true;
try
{
dst.merge(src);
}
catch (int)
{
do_throw = false;
}
assert(!do_throw);
assert(set_equal(src, set_type({1, 3, 5}, 0, throw_hasher<Counter<int>>(do_throw))));
assert(set_equal(dst, set_type({2, 4, 5}, 0, throw_hasher<Counter<int>>(do_throw))));
}
#endif
assert(Counter_base::gConstructed == 0);
struct equal
{
equal() = default;
bool operator()(const Counter<int>& lhs, const Counter<int>& rhs) const
{
return lhs == rhs;
}
};
struct hasher
{
hasher() = default;
typedef Counter<int> argument_type;
typedef size_t result_type;
size_t operator()(const Counter<int>& p) const { return std::hash<Counter<int>>()(p); }
};
{
typedef std::unordered_set<Counter<int>, std::hash<Counter<int>>, std::equal_to<Counter<int>>> first_set_type;
typedef std::unordered_set<Counter<int>, hasher, equal> second_set_type;
typedef std::unordered_multiset<Counter<int>, hasher, equal> third_set_type;
{
first_set_type first{1, 2, 3};
second_set_type second{2, 3, 4};
third_set_type third{1, 3};
assert(Counter_base::gConstructed == 8);
first.merge(second);
first.merge(third);
assert(set_equal(first, {1, 2, 3, 4}));
assert(set_equal(second, {2, 3}));
assert(set_equal(third, {1, 3}));
assert(Counter_base::gConstructed == 8);
}
assert(Counter_base::gConstructed == 0);
{
first_set_type first{1, 2, 3};
second_set_type second{2, 3, 4};
third_set_type third{1, 3};
assert(Counter_base::gConstructed == 8);
first.merge(std::move(second));
first.merge(std::move(third));
assert(set_equal(first, {1, 2, 3, 4}));
assert(set_equal(second, {2, 3}));
assert(set_equal(third, {1, 3}));
assert(Counter_base::gConstructed == 8);
}
assert(Counter_base::gConstructed == 0);
}
{
std::unordered_set<int> first;
{
std::unordered_set<int> second;
first.merge(second);
first.merge(std::move(second));
}
{
std::unordered_multiset<int> second;
first.merge(second);
first.merge(std::move(second));
}
}
}
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