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allocator.pass.cpp
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allocator.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++03, c++11, c++14
// <any>
// Check that we're consistently using std::allocator_traits to
// allocate/deallocate/construct/destroy objects in std::any.
// See https://llvm.org/PR45099 for details.
#include <any>
#include <cassert>
#include <cstddef>
#include <memory>
#include <type_traits>
#include <utility>
#include "test_macros.h"
// Make sure we don't fit in std::any's SBO
struct Large { char big[sizeof(std::any) + 1]; };
// Make sure we fit in std::any's SBO
struct Small { };
bool Large_was_allocated = false;
bool Large_was_constructed = false;
bool Large_was_destroyed = false;
bool Large_was_deallocated = false;
bool Small_was_allocated = false;
bool Small_was_constructed = false;
bool Small_was_destroyed = false;
bool Small_was_deallocated = false;
namespace std {
template <>
struct allocator<Large> {
using value_type = Large;
using size_type = std::size_t;
using difference_type = std::ptrdiff_t;
using propagate_on_container_move_assignment = std::true_type;
using is_always_equal = std::true_type;
Large* allocate(std::size_t n) {
Large_was_allocated = true;
return static_cast<Large*>(::operator new(n));
}
template <typename ...Args>
void construct(Large* p, Args&& ...args) {
new (p) Large(std::forward<Args>(args)...);
Large_was_constructed = true;
}
void destroy(Large* p) {
p->~Large();
Large_was_destroyed = true;
}
void deallocate(Large* p, std::size_t) {
Large_was_deallocated = true;
return ::operator delete(p);
}
};
template <>
struct allocator<Small> {
using value_type = Small;
using size_type = std::size_t;
using difference_type = std::ptrdiff_t;
using propagate_on_container_move_assignment = std::true_type;
using is_always_equal = std::true_type;
Small* allocate(std::size_t n) {
Small_was_allocated = true;
return static_cast<Small*>(::operator new(n));
}
template <typename ...Args>
void construct(Small* p, Args&& ...args) {
new (p) Small(std::forward<Args>(args)...);
Small_was_constructed = true;
}
void destroy(Small* p) {
p->~Small();
Small_was_destroyed = true;
}
void deallocate(Small* p, std::size_t) {
Small_was_deallocated = true;
return ::operator delete(p);
}
};
} // end namespace std
int main(int, char**) {
// Test large types
{
{
std::any a = Large();
(void)a;
assert(Large_was_allocated);
assert(Large_was_constructed);
}
assert(Large_was_destroyed);
assert(Large_was_deallocated);
}
// Test small types
{
{
std::any a = Small();
(void)a;
assert(!Small_was_allocated);
assert(Small_was_constructed);
}
assert(Small_was_destroyed);
assert(!Small_was_deallocated);
}
return 0;
}