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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: clang-8
// UNSUPPORTED: gcc-8, gcc-9
// <memory>
// template <class Alloc>
// struct allocator_traits
// {
// template <class Ptr, class... Args>
// static constexpr void construct(allocator_type& a, Ptr p, Args&&... args);
// ...
// };
#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;
};
template <class T>
struct B
{
typedef T value_type;
TEST_CONSTEXPR_CXX20 B(int& count) : count_(count) {}
#if TEST_STD_VER >= 11
template <class U, class ...Args>
TEST_CONSTEXPR_CXX20 void construct(U* p, Args&& ...args)
{
++count_;
#if TEST_STD_VER > 17
std::construct_at(p, std::forward<Args>(args)...);
#else
::new ((void*)p) U(std::forward<Args>(args)...);
#endif
}
#endif
int& count_;
};
struct A0
{
TEST_CONSTEXPR_CXX20 A0(int* count) {++*count;}
};
struct A1
{
TEST_CONSTEXPR_CXX20 A1(int* count, char c)
{
assert(c == 'c');
++*count;
}
};
struct A2
{
TEST_CONSTEXPR_CXX20 A2(int* count, char c, int i)
{
assert(c == 'd');
assert(i == 5);
++*count;
}
};
TEST_CONSTEXPR_CXX20 bool test()
{
{
int A0_count = 0;
A<A0> a;
std::allocator<A0> alloc;
A0* a0 = alloc.allocate(1);
assert(A0_count == 0);
std::allocator_traits<A<A0> >::construct(a, a0, &A0_count);
assert(A0_count == 1);
alloc.deallocate(a0, 1);
}
{
int A1_count = 0;
A<A1> a;
std::allocator<A1> alloc;
A1* a1 = alloc.allocate(1);
assert(A1_count == 0);
std::allocator_traits<A<A1> >::construct(a, a1, &A1_count, 'c');
assert(A1_count == 1);
alloc.deallocate(a1, 1);
}
{
int A2_count = 0;
A<A2> a;
std::allocator<A2> alloc;
A2* a2 = alloc.allocate(1);
assert(A2_count == 0);
std::allocator_traits<A<A2> >::construct(a, a2, &A2_count, 'd', 5);
assert(A2_count == 1);
alloc.deallocate(a2, 1);
}
{
typedef IncompleteHolder* VT;
typedef A<VT> Alloc;
Alloc a;
std::allocator<VT> alloc;
VT* vt = alloc.allocate(1);
std::allocator_traits<Alloc>::construct(a, vt, nullptr);
alloc.deallocate(vt, 1);
}
#if TEST_STD_VER >= 11
{
int A0_count = 0;
int b_construct = 0;
B<A0> b(b_construct);
std::allocator<A0> alloc;
A0* a0 = alloc.allocate(1);
assert(A0_count == 0);
assert(b_construct == 0);
std::allocator_traits<B<A0> >::construct(b, a0, &A0_count);
assert(A0_count == 1);
assert(b_construct == 1);
alloc.deallocate(a0, 1);
}
{
int A1_count = 0;
int b_construct = 0;
B<A1> b(b_construct);
std::allocator<A1> alloc;
A1* a1 = alloc.allocate(1);
assert(A1_count == 0);
assert(b_construct == 0);
std::allocator_traits<B<A1> >::construct(b, a1, &A1_count, 'c');
assert(A1_count == 1);
assert(b_construct == 1);
alloc.deallocate(a1, 1);
}
{
int A2_count = 0;
int b_construct = 0;
B<A2> b(b_construct);
std::allocator<A2> alloc;
A2* a2 = alloc.allocate(1);
assert(A2_count == 0);
assert(b_construct == 0);
std::allocator_traits<B<A2> >::construct(b, a2, &A2_count, 'd', 5);
assert(A2_count == 1);
assert(b_construct == 1);
alloc.deallocate(a2, 1);
}
#endif
return true;
}
int main(int, char**)
{
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
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