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/**************************************************************
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*************************************************************/
#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 */
#endif /* INCLUDED_RTL_ALLOCATOR_HXX */
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