merge.pass.cpp
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//===----------------------------------------------------------------------===//
//
// 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++98, c++03, c++11, c++14
// <set>
// class multiset
// template <class C2>
// void merge(set<Key, C2, Allocator>& source);
// template <class C2>
// void merge(set<Key, C2, Allocator>&& source);
// template <class C2>
// void merge(multiset<Key, C2, Allocator>& source);
// template <class C2>
// void merge(multiset<Key, C2, Allocator>&& source);
#include <set>
#include <cassert>
#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
struct throw_comparator
{
bool& should_throw_;
throw_comparator(bool& should_throw) : should_throw_(should_throw) {}
template <class T>
bool operator()(const T& lhs, const T& rhs) const
{
if (should_throw_)
throw 0;
return lhs < rhs;
}
};
#endif
int main(int, char**)
{
{
std::multiset<int> src{1, 3, 5};
std::multiset<int> dst{2, 4, 5};
dst.merge(src);
assert(set_equal(src, {}));
assert(set_equal(dst, {1, 2, 3, 4, 5, 5}));
}
#ifndef TEST_HAS_NO_EXCEPTIONS
{
bool do_throw = false;
typedef std::multiset<Counter<int>, throw_comparator> set_type;
set_type src({1, 3, 5}, throw_comparator(do_throw));
set_type dst({2, 4, 5}, throw_comparator(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}, throw_comparator(do_throw))));
assert(set_equal(dst, set_type({2, 4, 5}, throw_comparator(do_throw))));
}
#endif
assert(Counter_base::gConstructed == 0);
struct comparator
{
comparator() = default;
bool operator()(const Counter<int>& lhs, const Counter<int>& rhs) const
{
return lhs < rhs;
}
};
{
typedef std::multiset<Counter<int>, std::less<Counter<int>>> first_set_type;
typedef std::multiset<Counter<int>, comparator> second_set_type;
typedef std::set<Counter<int>, comparator> 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, 1, 2, 2, 3, 3, 3, 4}));
assert(set_equal(second, {}));
assert(set_equal(third, {}));
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, 1, 2, 2, 3, 3, 3, 4}));
assert(set_equal(second, {}));
assert(set_equal(third, {}));
assert(Counter_base::gConstructed == 8);
}
assert(Counter_base::gConstructed == 0);
}
{
std::multiset<int> first;
{
std::multiset<int> second;
first.merge(second);
first.merge(std::move(second));
}
{
std::set<int> second;
first.merge(second);
first.merge(std::move(second));
}
}
return 0;
}