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// Copyright 2013-2025 Daniel Parker
// Distributed under Boost license
#ifndef MOCK_STATEFUL_ALLOCATOR
#define MOCK_STATEFUL_ALLOCATOR
#include <algorithm>
#include <memory>
#include <list>
#include <type_traits>
#include <utility>
template <typename T>
class mock_stateful_allocator
{
std::allocator<T> impl_;
int id_;
public:
using value_type = T;
using size_type = std::size_t;
using pointer = T*;
using const_pointer = const T*;
using reference = T&;
using const_reference = const T&;
using difference_type = std::ptrdiff_t;
using propagate_on_container_copy_assignment = std::false_type;
using propagate_on_container_move_assignment = std::true_type;
using propagate_on_container_swap = std::true_type;
using is_always_equal = std::false_type;
mock_stateful_allocator() = delete;
mock_stateful_allocator(int id) noexcept
: impl_(), id_(id)
{
}
mock_stateful_allocator(const mock_stateful_allocator<T>& other) noexcept
: impl_(), id_(other.id_)
{
}
template <typename U>
friend class mock_stateful_allocator;
template <typename U>
mock_stateful_allocator(const mock_stateful_allocator<U>& other) noexcept
: impl_(), id_(other.id_)
{
}
mock_stateful_allocator& operator = (const mock_stateful_allocator& other) = default;
T* allocate(size_type n)
{
return impl_.allocate(n);
}
void deallocate(T* ptr, size_type n)
{
impl_.deallocate(ptr, n);
}
friend bool operator==(const mock_stateful_allocator& lhs, const mock_stateful_allocator& rhs) noexcept
{
return lhs.id_ == rhs.id_;
}
friend bool operator!=(const mock_stateful_allocator& lhs, const mock_stateful_allocator& rhs) noexcept
{
return lhs.id_ != rhs.id_;
}
};
#endif
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