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// Boost.Range library
//
// Copyright Neil Groves 2010. Use, modification and
// distribution is subject to the Boost Software License, Version
// 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// For more information, see http://www.boost.org/libs/range/
//
#ifndef BOOST_RANGE_DETAIL_ANY_ITERATOR_BUFFER_HPP_INCLUDED
#define BOOST_RANGE_DETAIL_ANY_ITERATOR_BUFFER_HPP_INCLUDED
#include <boost/array.hpp>
#include <boost/assert.hpp>
#include <boost/static_assert.hpp>
#include <boost/noncopyable.hpp>
namespace boost
{
template<std::size_t StackBufferSize>
class any_iterator_buffer
: noncopyable
{
BOOST_STATIC_ASSERT(( StackBufferSize > 0 ));
public:
any_iterator_buffer()
: m_ptr()
{
}
~any_iterator_buffer()
{
delete [] m_ptr;
}
void* allocate(std::size_t bytes)
{
BOOST_ASSERT( !m_ptr );
if (bytes <= StackBufferSize)
return m_buffer.data();
m_ptr = new char[bytes];
return m_ptr;
}
void deallocate()
{
delete [] m_ptr;
m_ptr = 0;
}
private:
// Rationale:
// Do not use inheritance from noncopyable because this causes
// the concepts to erroneous detect the derived any_iterator
// as noncopyable.
any_iterator_buffer(const any_iterator_buffer&);
void operator=(const any_iterator_buffer&);
char* m_ptr;
boost::array<char, StackBufferSize> m_buffer;
};
class any_iterator_heap_only_buffer
: noncopyable
{
public:
any_iterator_heap_only_buffer()
: m_ptr()
{
}
~any_iterator_heap_only_buffer()
{
delete [] m_ptr;
}
void* allocate(std::size_t bytes)
{
BOOST_ASSERT( !m_ptr );
m_ptr = new char[bytes];
return m_ptr;
}
void deallocate()
{
delete [] m_ptr;
m_ptr = 0;
}
private:
char* m_ptr;
};
template<std::size_t StackBufferSize>
class any_iterator_stack_only_buffer
{
BOOST_STATIC_ASSERT(( StackBufferSize > 0 ));
public:
void* allocate(std::size_t bytes)
{
BOOST_ASSERT( bytes <= m_buffer.size() );
return m_buffer.data();
}
void deallocate()
{
}
private:
boost::array<char, StackBufferSize> m_buffer;
};
typedef any_iterator_buffer<64> any_iterator_default_buffer;
} // namespace boost
#endif // include guard
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