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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++03, c++11, c++14, c++17
// This test ensures that we properly propagate allocators, per https://wg21.link/p1165r1
#include <cassert>
#include <string>
#include "test_macros.h"
template <class T>
class soccc_allocator {
int* soccc_count;
int self_soccc_count;
public:
using value_type = T;
constexpr explicit soccc_allocator(int* soccc_count_, int self_coccc_count_ = 0)
: soccc_count(soccc_count_), self_soccc_count(self_coccc_count_) {}
template <class U>
constexpr soccc_allocator(const soccc_allocator<U>& a) : soccc_count(a.get_soccc()) {}
constexpr T* allocate(std::size_t n) { return std::allocator<T>().allocate(n); }
constexpr void deallocate(T* p, std::size_t s) { std::allocator<T>().deallocate(p, s); }
constexpr soccc_allocator select_on_container_copy_construction() const {
*soccc_count += 1;
return soccc_allocator(soccc_count, self_soccc_count + 1);
}
constexpr auto get_soccc() const { return soccc_count; }
constexpr auto get_self_soccc() const { return self_soccc_count; }
typedef std::true_type propagate_on_container_copy_assignment;
typedef std::true_type propagate_on_container_move_assignment;
typedef std::true_type propagate_on_container_swap;
template <class U>
constexpr bool operator==(const soccc_allocator<U>& that) const {
return soccc_count == that.get_soccc();
}
};
template <class CharT>
TEST_CONSTEXPR_CXX20 bool test() {
using S = std::basic_string<CharT, std::char_traits<CharT>, soccc_allocator<CharT>>;
{
int soccc_lhs = 0;
int soccc_rhs = 0;
S lhs(soccc_allocator<CharT>{&soccc_lhs});
S rhs(soccc_allocator<CharT>{&soccc_rhs});
auto r = lhs + rhs;
assert(r.get_allocator().get_soccc() == &soccc_lhs);
assert(r.get_allocator().get_self_soccc() == 1);
assert(soccc_lhs == 1);
assert(soccc_rhs == 0);
}
{
int soccc_lhs = 0;
int soccc_rhs = 0;
S lhs(soccc_allocator<CharT>{&soccc_lhs});
S rhs(soccc_allocator<CharT>{&soccc_rhs});
auto r = lhs + std::move(rhs);
assert(r.get_allocator().get_soccc() == &soccc_rhs);
assert(r.get_allocator().get_self_soccc() == 0);
assert(soccc_lhs == 0);
assert(soccc_rhs == 0);
}
{
int soccc_lhs = 0;
int soccc_rhs = 0;
S lhs(soccc_allocator<CharT>{&soccc_lhs});
S rhs(soccc_allocator<CharT>{&soccc_rhs});
auto r = std::move(lhs) + rhs;
assert(r.get_allocator().get_soccc() == &soccc_lhs);
assert(r.get_allocator().get_self_soccc() == 0);
assert(soccc_lhs == 0);
assert(soccc_rhs == 0);
}
{
int soccc_lhs = 0;
int soccc_rhs = 0;
S lhs(soccc_allocator<CharT>{&soccc_lhs});
S rhs(soccc_allocator<CharT>{&soccc_rhs});
auto r = std::move(lhs) + std::move(rhs);
assert(r.get_allocator().get_soccc() == &soccc_lhs);
assert(r.get_allocator().get_self_soccc() == 0);
assert(soccc_lhs == 0);
assert(soccc_rhs == 0);
}
{
int soccc_lhs = 0;
int soccc_rhs = 0;
S lhs(soccc_allocator<CharT>{&soccc_lhs});
S rhs(soccc_allocator<CharT>{&soccc_rhs});
auto r = lhs + rhs.data();
assert(r.get_allocator().get_soccc() == &soccc_lhs);
assert(r.get_allocator().get_self_soccc() == 1);
assert(soccc_lhs == 1);
assert(soccc_rhs == 0);
}
{
int soccc_lhs = 0;
int soccc_rhs = 0;
S lhs(soccc_allocator<CharT>{&soccc_lhs});
S rhs(soccc_allocator<CharT>{&soccc_rhs});
auto r = lhs + rhs[0];
assert(r.get_allocator().get_soccc() == &soccc_lhs);
assert(r.get_allocator().get_self_soccc() == 1);
assert(soccc_lhs == 1);
assert(soccc_rhs == 0);
}
{
int soccc_lhs = 0;
int soccc_rhs = 0;
S lhs(soccc_allocator<CharT>{&soccc_lhs});
S rhs(soccc_allocator<CharT>{&soccc_rhs});
auto r = std::move(lhs) + rhs.data();
assert(r.get_allocator().get_soccc() == &soccc_lhs);
assert(r.get_allocator().get_self_soccc() == 0);
assert(soccc_lhs == 0);
assert(soccc_rhs == 0);
}
{
int soccc_lhs = 0;
int soccc_rhs = 0;
S lhs(soccc_allocator<CharT>{&soccc_lhs});
S rhs(soccc_allocator<CharT>{&soccc_rhs});
auto r = std::move(lhs) + rhs[0];
assert(r.get_allocator().get_soccc() == &soccc_lhs);
assert(r.get_allocator().get_self_soccc() == 0);
assert(soccc_lhs == 0);
assert(soccc_rhs == 0);
}
{
int soccc_lhs = 0;
int soccc_rhs = 0;
S lhs(soccc_allocator<CharT>{&soccc_lhs});
S rhs(soccc_allocator<CharT>{&soccc_rhs});
auto r = lhs.data() + rhs;
assert(r.get_allocator().get_soccc() == &soccc_rhs);
assert(r.get_allocator().get_self_soccc() == 1);
assert(soccc_lhs == 0);
assert(soccc_rhs == 1);
}
{
int soccc_lhs = 0;
int soccc_rhs = 0;
S lhs(soccc_allocator<CharT>{&soccc_lhs});
S rhs(soccc_allocator<CharT>{&soccc_rhs});
auto r = lhs[0] + rhs;
assert(r.get_allocator().get_soccc() == &soccc_rhs);
assert(r.get_allocator().get_self_soccc() == 1);
assert(soccc_lhs == 0);
assert(soccc_rhs == 1);
}
{
int soccc_lhs = 0;
int soccc_rhs = 0;
S lhs(soccc_allocator<CharT>{&soccc_lhs});
S rhs(soccc_allocator<CharT>{&soccc_rhs});
auto r = lhs.data() + std::move(rhs);
assert(r.get_allocator().get_soccc() == &soccc_rhs);
assert(r.get_allocator().get_self_soccc() == 0);
assert(soccc_lhs == 0);
assert(soccc_rhs == 0);
}
{
int soccc_lhs = 0;
int soccc_rhs = 0;
S lhs(soccc_allocator<CharT>{&soccc_lhs});
S rhs(soccc_allocator<CharT>{&soccc_rhs});
auto r = lhs[0] + std::move(rhs);
assert(r.get_allocator().get_soccc() == &soccc_rhs);
assert(r.get_allocator().get_self_soccc() == 0);
assert(soccc_lhs == 0);
assert(soccc_rhs == 0);
}
return true;
}
int main(int, char**) {
test<char>();
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
test<wchar_t>();
#endif
#if TEST_STD_VER > 17
static_assert(test<char>());
#ifndef TEST_HAS_NO_WIDE_CHARACTERS
static_assert(test<wchar_t>());
#endif
#endif
return 0;
}
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