//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// <memory>
// template <class Alloc>
// struct allocator_traits
// {
// static constexpr allocator_type
// select_on_container_copy_construction(const allocator_type& a);
// ...
// };
#include <memory>
#include <new>
#include <type_traits>
#include <cassert>
#include "test_macros.h"
#include "incomplete_type_helper.h"
template <class T>
struct A
{
typedef T value_type;
int id;
TEST_CONSTEXPR_CXX20 explicit A(int i = 0) : id(i) {}
};
template <class T>
struct B
{
typedef T value_type;
int id;
TEST_CONSTEXPR_CXX20 explicit B(int i = 0) : id(i) {}
TEST_CONSTEXPR_CXX20 B select_on_container_copy_construction() const
{
return B(100);
}
};
TEST_CONSTEXPR_CXX20 bool test()
{
{
A<int> a;
assert(std::allocator_traits<A<int> >::select_on_container_copy_construction(a).id == 0);
}
{
const A<int> a(0);
assert(std::allocator_traits<A<int> >::select_on_container_copy_construction(a).id == 0);
}
{
typedef IncompleteHolder* VT;
typedef A<VT> Alloc;
Alloc a;
assert(std::allocator_traits<Alloc>::select_on_container_copy_construction(a).id == 0);
}
#if TEST_STD_VER >= 11
{
B<int> b;
assert(std::allocator_traits<B<int> >::select_on_container_copy_construction(b).id == 100);
}
{
const B<int> b(0);
assert(std::allocator_traits<B<int> >::select_on_container_copy_construction(b).id == 100);
}
#endif
return true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}