mirror of https://github.com/CGAL/cgal
137 lines
4.0 KiB
C++
137 lines
4.0 KiB
C++
// Copyright (c) 2000 Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
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// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
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// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
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// and Tel-Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; version 2.1 of the License.
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// See the file LICENSE.LGPL distributed with CGAL.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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//
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//
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// Author(s) : ?
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#ifndef LEDA_ALLOCATOR_H
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#define LEDA_ALLOCATOR_H
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#if !defined(LEDA_ROOT_INCL_ID)
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#define LEDA_ROOT_INCL_ID 390009
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#include <LEDA/REDEFINE_NAMES.h>
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#endif
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#include <CGAL/LEDA_basic.h>
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// the following piece of code is programmed according to
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// the C++ standard clause 20.4.1
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template <class T> class leda_allocator;
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// specialize for void:
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template <> class leda_allocator<void> {
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public:
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typedef void* pointer;
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typedef const void* const_pointer;
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// reference-to-void members are impossible.
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typedef void value_type;
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template <class U> struct rebind { typedef leda_allocator<U> other; };
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};
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/*{\Manpage {leda_allocator} {T} {Memory Allocator} {A}}*/
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template <class T>
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class leda_allocator {
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/*{\Mdefinition An instance |\Mvar| of the data type |\Mname| is
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a memory allocator according to the \CC standard. |\Mname| is the
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standard compliant interface to the LEDA memory management.}*/
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public:
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/*{\Mtypes 5}*/
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/*{\Mtext Local types are |size_type|, |difference_type|, |value_type|,
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|pointer|, |reference|, |const_pointer|, and |const_reference|.}*/
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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typedef T value_type;
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typedef T* pointer;
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typedef const T* const_pointer;
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typedef T& reference;
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typedef const T& const_reference;
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template <class T1> class rebind { public:
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/*{\Mtypemember allows the construction of a derived allocator:\\
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|\Mname::template rebind<T1>::other|\\ is the type
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|leda_allocator<T1>|. }*/
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typedef leda_allocator<T1> other;
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};
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/*{\Mcreation 4.5}*/
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leda_allocator() {}
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/*{\Mcreate introduces a variable |\Mvar| of type |\Mname|. }*/
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template <class TO>
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leda_allocator(const leda_allocator<TO>&) {}
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~leda_allocator() {}
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/*{\Moperations 3 3 }*/
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pointer allocate(size_type n, const_pointer = 0)
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/*{\Mop returns a pointer to a newly allocated memory range of size
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|n * sizeof(T)|.}*/
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{ return 0 == n ? 0 :
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(T*) CGAL_LEDA_SCOPE::std_memory_mgr.allocate_bytes( n * sizeof(T) ); }
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void deallocate(pointer p, size_type n)
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/*{\Mop deallocates a memory range of |n * sizeof(T)| starting
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at |p|. \precond the memory range was obtained via |allocate(n)|.}*/
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{ CGAL_LEDA_SCOPE::std_memory_mgr.deallocate_bytes(p , n * sizeof(T)); }
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pointer address(reference r)
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/*{\Mop returns |&r|.}*/
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{ return &r; }
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const_pointer address(const_reference r)
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/*{\Mop returns |&r|.}*/
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{ return &r; }
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void construct(pointer p, const_reference r)
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/*{\Mop makes an inplace new |new( (void*)p ) T(r)|.}*/
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{ new(p) value_type(r); }
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void destroy(pointer p)
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/*{\Mop destroys the object referenced via |p| by calling |p->~T()|.}*/
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{ p->~T(); }
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size_type max_size() const
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/*{\Mop the largest value |n| for which the call |allocate(n,0)|
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might succeed.}*/
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{ return CGAL_LEDA_SCOPE::std_memory_mgr.max_size(); }
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};
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/*{\Mimplementation Note that the above class template uses all kinds
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of modern compiler technology like member templates, partial specialization
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etc. It runs only on a subset of LEDA's general supported platforms like
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|g++ > 2.95|, |SGI CC > 7.3|.}*/
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#if LEDA_ROOT_INCL_ID == 390009
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#undef LEDA_ROOT_INCL_ID
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#include <LEDA/UNDEFINE_NAMES.h>
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#endif
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#endif // LEDA_ALLOCATOR_H
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