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// Copyright 2023 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#pragma once
#include "pw_allocator/allocator.h"
#include "pw_status/status.h"
namespace pw::allocator {
/// This class simply dispatches between a primary and secondary allocator. Any
/// attempt to allocate memory will first be handled by the primary allocator.
/// If it cannot allocate memory, e.g. because it is out of memory, the
/// secondary alloator will try to allocate memory instead.
class FallbackAllocator : public Allocator {
public:
constexpr FallbackAllocator() = default;
/// Sets the primary and secondary allocators.
///
/// It is an error to call any method without calling this method first.
void Initialize(Allocator& primary, Allocator& secondary);
private:
/// @copydoc Allocator::Query
Status DoQuery(const void* ptr, Layout layout) const override;
/// @copydoc Allocator::Allocate
void* DoAllocate(Layout layout) override;
/// @copydoc Allocator::Deallocate
void DoDeallocate(void* ptr, Layout layout) override;
/// @copydoc Allocator::Resize
bool DoResize(void* ptr, Layout layout, size_t new_size) override;
Allocator* primary_ = nullptr;
Allocator* secondary_ = nullptr;
};
} // namespace pw::allocator
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