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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"
namespace pw::allocator {
/// A memory allocator that always fails to allocate memory.
///
/// A null allocator may be useful as part of a larger framework if allocation
/// should be disallowed under certain circumstances. For example, a function
/// that returns different allocators based on an input parameter may return a
/// null allocator when given an invalid or unsupported parameter value.
class NullAllocator : public Allocator {
public:
constexpr NullAllocator() = default;
private:
/// @copydoc Allocator::Allocate
void* DoAllocate(size_t, size_t) override { return nullptr; }
/// @copydoc Allocator::Deallocate
void DoDeallocate(void*, size_t, size_t) override {}
/// @copydoc Allocator::Resize
bool DoResize(void*, size_t, size_t, size_t) override { return false; }
};
} // namespace pw::allocator
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