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65 lines
2.3 KiB
C++
65 lines
2.3 KiB
C++
/*
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* Copyright 2021 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef FLATBUFFERS_DEFAULT_ALLOCATOR_H_
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#define FLATBUFFERS_DEFAULT_ALLOCATOR_H_
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#include "flatbuffers/allocator.h"
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#include "flatbuffers/base.h"
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namespace flatbuffers {
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// DefaultAllocator uses new/delete to allocate memory regions
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class DefaultAllocator : public Allocator {
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public:
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uint8_t* allocate(size_t size) FLATBUFFERS_OVERRIDE {
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return new uint8_t[size];
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}
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void deallocate(uint8_t* p, size_t) FLATBUFFERS_OVERRIDE { delete[] p; }
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static void dealloc(void* p, size_t) { delete[] static_cast<uint8_t*>(p); }
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};
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// These functions allow for a null allocator to mean use the default allocator,
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// as used by DetachedBuffer and vector_downward below.
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// This is to avoid having a statically or dynamically allocated default
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// allocator, or having to move it between the classes that may own it.
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inline uint8_t* Allocate(Allocator* allocator, size_t size) {
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return allocator ? allocator->allocate(size)
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: DefaultAllocator().allocate(size);
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}
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inline void Deallocate(Allocator* allocator, uint8_t* p, size_t size) {
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if (allocator)
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allocator->deallocate(p, size);
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else
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DefaultAllocator().deallocate(p, size);
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}
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inline uint8_t* ReallocateDownward(Allocator* allocator, uint8_t* old_p,
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size_t old_size, size_t new_size,
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size_t in_use_back, size_t in_use_front) {
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return allocator ? allocator->reallocate_downward(old_p, old_size, new_size,
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in_use_back, in_use_front)
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: DefaultAllocator().reallocate_downward(
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old_p, old_size, new_size, in_use_back, in_use_front);
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}
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} // namespace flatbuffers
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#endif // FLATBUFFERS_DEFAULT_ALLOCATOR_H_
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