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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: allocator.hxx,v $
* $Revision: 1.3 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#if !defined INCLUDED_RTL_ALLOCATOR_HXX
#define INCLUDED_RTL_ALLOCATOR_HXX
#if ! defined(_SAL_TYPES_H_)
#include "sal/types.h"
#endif
#if ! defined(_RTL_ALLOC_H_)
#include "rtl/alloc.h"
#endif
#include <cstddef>
//######################################################
// This is no general purpose STL allocator but one
// necessary to use STL for some implementation but
// avoid linking sal against the STLPort library!!!
// For more information on when and how to define a
// custom stl allocator have a look at Scott Meyers:
// "Effective STL", Nicolai M. Josuttis:
// "The C++ Standard Library - A Tutorial and Reference"
// and at http://www.josuttis.com/cppcode/allocator.html
namespace rtl {
/** @internal */
template<class T>
class Allocator
{
public:
typedef T value_type;
typedef T* pointer;
typedef const T* const_pointer;
typedef T& reference;
typedef const T& const_reference;
typedef ::std::size_t size_type;
typedef ::std::ptrdiff_t difference_type;
//-----------------------------------------
template<class U>
struct rebind
{
typedef Allocator<U> other;
};
//-----------------------------------------
pointer address (reference value) const
{
return &value;
}
//-----------------------------------------
const_pointer address (const_reference value) const
{
return &value;
}
//-----------------------------------------
Allocator() SAL_THROW(())
{}
//-----------------------------------------
template<class U>
Allocator (const Allocator<U>&) SAL_THROW(())
{}
//-----------------------------------------
Allocator(const Allocator&) SAL_THROW(())
{}
//-----------------------------------------
~Allocator() SAL_THROW(())
{}
//-----------------------------------------
size_type max_size() const SAL_THROW(())
{
return size_type(-1)/sizeof(T);
}
//-----------------------------------------
/* Normally the code for allocate should
throw a std::bad_alloc exception if the
requested memory could not be allocated:
(C++ standard 20.4.1.1):
pointer allocate (size_type n, const void* hint = 0)
{
pointer p = reinterpret_cast<pointer>(
rtl_allocateMemory(sal_uInt32(n * sizeof(T))));
if (NULL == p)
throw ::std::bad_alloc();
return p;
}
but some compilers do not compile it if exceptions
are not enabled, e.g. GCC under Linux and it is
in general not desired to compile sal with exceptions
enabled. */
pointer allocate (size_type n, const void* hint = 0)
{
hint = hint; /* avoid warnings */
return reinterpret_cast<pointer>(
rtl_allocateMemory(sal_uInt32(n * sizeof(T))));
}
//-----------------------------------------
void deallocate (pointer p, size_type /* n */)
{
rtl_freeMemory(p);
}
//-----------------------------------------
void construct (pointer p, const T& value)
{
new ((void*)p)T(value);
}
//-----------------------------------------
void destroy (pointer p)
{
p->~T();
}
};
//######################################################
// Custom STL allocators must be stateless (see
// references above) that's why the operators below
// return always true or false
/** @internal */
template<class T, class U>
inline bool operator== (const Allocator<T>&, const Allocator<U>&) SAL_THROW(())
{
return true;
}
/** @internal */
template<class T, class U>
inline bool operator!= (const Allocator<T>&, const Allocator<U>&) SAL_THROW(())
{
return false;
}
} /* namespace rtl */
//######################################################
/** REQUIRED BY STLPort (see stlport '_alloc.h'):
Hack for compilers that do not support member
template classes (e.g. MSVC 6)
@internal
*/
namespace _STL
{
/** @internal */
template<class T, class U>
inline ::rtl::Allocator<U> & __stl_alloc_rebind (::rtl::Allocator<T> & a, U const *)
{
return (::rtl::Allocator<U>&)(a);
}
}
#endif /* INCLUDED_RTL_ALLOCATOR_HXX */
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