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allocator_deleter.hpp
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105 lines (89 loc) · 2.57 KB
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// Copyright 2015 Open Source Robotics Foundation, Inc.
//
// 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
//
// 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 RCLCPP__ALLOCATOR__ALLOCATOR_DELETER_HPP_
#define RCLCPP__ALLOCATOR__ALLOCATOR_DELETER_HPP_
#include <memory>
#include <stdexcept>
namespace rclcpp
{
namespace allocator
{
template<typename Allocator>
class AllocatorDeleter
{
template<typename T>
using AllocRebind = typename std::allocator_traits<Allocator>::template rebind_alloc<T>;
public:
AllocatorDeleter()
: allocator_(nullptr)
{
}
explicit AllocatorDeleter(Allocator * a)
: allocator_(a)
{
}
template<typename T>
AllocatorDeleter(const AllocatorDeleter<T> & a)
{
allocator_ = a.get_allocator();
}
template<typename T>
void operator()(T * ptr)
{
std::allocator_traits<AllocRebind<T>>::destroy(*allocator_, ptr);
std::allocator_traits<AllocRebind<T>>::deallocate(*allocator_, ptr, 1);
ptr = nullptr;
}
Allocator * get_allocator() const
{
return allocator_;
}
void set_allocator(Allocator * alloc)
{
allocator_ = alloc;
}
private:
Allocator * allocator_;
};
template<typename Alloc, typename T, typename D>
void set_allocator_for_deleter(D * deleter, Alloc * alloc)
{
(void) alloc;
(void) deleter;
throw std::runtime_error("Reached unexpected template specialization");
}
template<typename T, typename U>
void set_allocator_for_deleter(std::default_delete<T> * deleter, std::allocator<U> * alloc)
{
(void) deleter;
(void) alloc;
}
template<typename Alloc, typename T>
void set_allocator_for_deleter(AllocatorDeleter<T> * deleter, Alloc * alloc)
{
if (!deleter || !alloc) {
throw std::invalid_argument("Argument was NULL to set_allocator_for_deleter");
}
deleter->set_allocator(alloc);
}
template<typename Alloc, typename T>
using Deleter = typename std::conditional<
std::is_same<typename std::allocator_traits<Alloc>::template rebind_alloc<T>,
std::allocator<T>>::value,
std::default_delete<T>,
AllocatorDeleter<Alloc>
>::type;
} // namespace allocator
} // namespace rclcpp
#endif // RCLCPP__ALLOCATOR__ALLOCATOR_DELETER_HPP_