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/* This file is part of the Gudhi Library. The Gudhi library
* (Geometric Understanding in Higher Dimensions) is a generic C++
* library for computational topology.
*
* Author(s): Marc Glisse
*
* Copyright (C) 2015 Inria
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef SIMPLE_OBJECT_POOL_H_
#define SIMPLE_OBJECT_POOL_H_
#include <boost/pool/pool.hpp>
#include <utility>
namespace Gudhi {
/** \private
* This is a simpler version of boost::object_pool, that requires
* that users explicitly destroy all objects. This lets the
* performance scale much better, see
* https://svn.boost.org/trac/boost/ticket/3789 .
*/
template <class T>
class Simple_object_pool : protected boost::pool<boost::default_user_allocator_malloc_free> {
protected:
typedef boost::pool<boost::default_user_allocator_malloc_free> Base;
typedef T* pointer;
Base& base() {
return *this;
}
Base const& base()const {
return *this;
}
public:
typedef T element_type;
typedef boost::default_user_allocator_malloc_free user_allocator;
typedef typename Base::size_type size_type;
typedef typename Base::difference_type difference_type;
template<class...U>
Simple_object_pool(U&&...u) : Base(sizeof (T), std::forward<U>(u)...) { }
template<class...U>
pointer construct(U&&...u) {
void* p = base().malloc BOOST_PREVENT_MACRO_SUBSTITUTION();
assert(p);
try {
new(p) T(std::forward<U>(u)...);
} catch (...) {
base().free BOOST_PREVENT_MACRO_SUBSTITUTION(p);
throw;
}
return static_cast<pointer> (p);
}
void destroy(pointer p) {
p->~T();
base().free BOOST_PREVENT_MACRO_SUBSTITUTION(p);
}
};
} // namespace Gudhi
#endif // SIMPLE_OBJECT_POOL_H_
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