Backmerge of trunk

git-svn-id: svn+ssh://scm.gforge.inria.fr/svnroot/gudhi/branches/alphashapes@820 636b058d-ea47-450e-bf9e-a15bfbe3eedb

Former-commit-id: 812e0b84d187dd5e30a6a18c12612ebc9bf9206a

1 files changed, 64 insertions, 0 deletions

diff --git a/src/common/include/gudhi/Simple_object_pool.h b/src/common/include/gudhi/Simple_object_pool.h
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+++ b/src/common/include/gudhi/Simple_object_pool.h
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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 Saclay - Ile de France
+ *
+ *    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/>.
+ */
+
+#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);
+  }
+};
+}