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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
//
//===----------------------------------------------------------------------===//
// <unordered_set>
// template <class Value, class Hash = hash<Value>, class Pred = equal_to<Value>,
// class Alloc = allocator<Value>>
// class unordered_multiset
// iterator erase(const_iterator p)
#include <unordered_set>
#include <cassert>
#include "test_macros.h"
#include "min_allocator.h"
struct TemplateConstructor
{
template<typename T>
TemplateConstructor (const T&) {}
};
bool operator==(const TemplateConstructor&, const TemplateConstructor&) { return false; }
struct Hash { size_t operator() (const TemplateConstructor &) const { return 0; } };
int main(int, char**)
{
{
typedef std::unordered_multiset<int> C;
typedef int P;
P a[] =
{
P(1),
P(2),
P(3),
P(4),
P(1),
P(2)
};
C c(a, a + sizeof(a)/sizeof(a[0]));
C::const_iterator i = c.find(2);
C::const_iterator i_next = i;
++i_next;
C::iterator j = c.erase(i);
assert(j == i_next);
assert(c.size() == 5);
assert(c.count(1) == 2);
assert(c.count(2) == 1);
assert(c.count(3) == 1);
assert(c.count(4) == 1);
}
#if TEST_STD_VER >= 11
{
typedef std::unordered_multiset<int, std::hash<int>,
std::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 c(a, a + sizeof(a)/sizeof(a[0]));
C::const_iterator i = c.find(2);
C::const_iterator i_next = i;
++i_next;
C::iterator j = c.erase(i);
assert(j == i_next);
assert(c.size() == 5);
assert(c.count(1) == 2);
assert(c.count(2) == 1);
assert(c.count(3) == 1);
assert(c.count(4) == 1);
}
#endif
#if TEST_STD_VER >= 14
{
// This is LWG #2059
typedef TemplateConstructor T;
typedef std::unordered_set<T, Hash> C;
typedef C::iterator I;
C m;
T a{0};
I it = m.find(a);
if (it != m.end())
m.erase(it);
}
#endif
return 0;
}
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