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Copy pathallocator.h
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100 lines (78 loc) · 2.81 KB
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you 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
//
// http://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.
#ifndef ARROW_ALLOCATOR_H
#define ARROW_ALLOCATOR_H
#include <cstddef>
#include <memory>
#include <utility>
#include "arrow/memory_pool.h"
#include "arrow/status.h"
#include "arrow/util/macros.h"
namespace arrow {
template <class T>
class stl_allocator {
public:
using value_type = T;
using pointer = T*;
using const_pointer = const T*;
using reference = T&;
using const_reference = const T&;
using size_type = std::size_t;
using difference_type = std::ptrdiff_t;
template <class U>
struct rebind {
using other = stl_allocator<U>;
};
stl_allocator() noexcept : pool_(default_memory_pool()) {}
explicit stl_allocator(MemoryPool* pool) noexcept : pool_(pool) {}
template <class U>
stl_allocator(const stl_allocator<U>& rhs) noexcept : pool_(rhs.pool_) {}
~stl_allocator() { pool_ = NULLPTR; }
pointer address(reference r) const noexcept { return std::addressof(r); }
const_pointer address(const_reference r) const noexcept { return std::addressof(r); }
pointer allocate(size_type n, const void* /*hint*/ = NULLPTR) {
uint8_t* data;
Status s = pool_->Allocate(n * sizeof(T), &data);
if (!s.ok()) throw std::bad_alloc();
return reinterpret_cast<pointer>(data);
}
void deallocate(pointer p, size_type n) {
pool_->Free(reinterpret_cast<uint8_t*>(p), n * sizeof(T));
}
size_type size_max() const noexcept { return size_type(-1) / sizeof(T); }
template <class U, class... Args>
void construct(U* p, Args&&... args) {
new (reinterpret_cast<void*>(p)) U(std::forward<Args>(args)...);
}
template <class U>
void destroy(U* p) {
p->~U();
}
MemoryPool* pool() const noexcept { return pool_; }
private:
MemoryPool* pool_;
};
template <class T1, class T2>
bool operator==(const stl_allocator<T1>& lhs, const stl_allocator<T2>& rhs) noexcept {
return lhs.pool() == rhs.pool();
}
template <class T1, class T2>
bool operator!=(const stl_allocator<T1>& lhs, const stl_allocator<T2>& rhs) noexcept {
return !(lhs == rhs);
}
} // namespace arrow
#endif // ARROW_ALLOCATOR_H